Ts 940 low receive

The TS-940S receiver covers from 1 50 kHz to 30 MHz. to receive international broadcast and communication ser- vices. As shown in the Frequency Allocation Chart, above figure, broadcast and Amateur radio station frequencies are allo- cated in specific bands expressed in megahertz (MHz) or wavelength in meters (m). Also in the above figure the fre- The TS-940 I.F. board has the 455K12. A CFJ455K5 is also one way to go but the K12 is much better. The SSB filter can also be replaced with a good old made in America Collins 3.1 kHz mechanical filter. Several case styles of these filters are not collectable and can be had at reasonable cost. Again check out EBAY.Jul 11, 2018 · RSS. ak6ok. (@ak6ok) Member Admin. I just upgraded a customers TS-940 with a new power supply kit and on testing the receive sensitivity, found that the receiver only responds to signals greater than about 1mv. The attenuator works fine, and the transmitter works well. Just a really numb receiver. Where is the best place to start? Put the covers back on the TS-940S and secure them with the 16 case screws. Connect the antenna and power cord then test the transceiver for normal operation. This is an optional change and may not be performed under warranty. Time required for this change is 1 hour or less. TS-940S erratic display. low-frequency reproduction has proven to be an excellent choice for small to medium sized houses. The TS940D incorporates a number of in-staller-recommended features, for quick, trouble-free and low-cost installation. Among these features is a dedicated crossover/ equilizer that is easily flush mounted in the pre-sized, pre-drilled hole located ...I paid about $350 for my TS -940SAT several years ago. Initially, a great deal of cleaning and some servicing had to be done to get the radio completely up to snuff -- battling the intermittent"dreaded dots" problem and such. The TS-940 is a triple conversion receiver design, so If you can hear a signal at all, the receive circuitry is working, but your sensitivity is low, which typically indicates the problem is right at the antenna input. TS940 service manual (4.7MB) which is in PDF format. Before making any tests on either board it is best to check that the supply voltages are correct. On the PLL board connector 5 pin 5 should be +5V and pin 3, +15V. Each individual phase lock loop produces a permanent voltage of around +4.75V if it is in lock and just above 0V if it is out ofKenwood TS-850 and TS-850S links category is a curation of 26 web resources on , The TS-850S Repair Page by N6TR, Kenwood/Trio - TS-850S, The TS850 heaven. Resources listed under Kenwood TS-850 category belongs to HF Transceivers main collection, and get reviewed and rated by amateur radio operators.The relays are large,heavy-duty Tyco D2n style, with AgNI gold covered contacts, rated 3A, 250VAC, with excellent low current characteristics. Thay are rated for 15,000,000 mechanical operations and 2,000,000 electrical operations at 6V 100ma - Close to our use! See how to locate, diagnose, and test your relay, here on the RL-1 Page.Mar 24, 1997 · I have a problem with my TS-940 and was wondering if anyone else has had it. All the frequency digits change from numbers to decimal points. If the frequency is changed, the correct display will appear but return to Decimal Points within 2 seconds. It appears most controls that are read by the processor will make this happen. Plus, in my opinion, an aging TS-940S is still well worth the trouble of contact cleaning, Molex grooming and solder trace re-flowing. Once it's working properly again, you'll have one of the best HF rigs ever made; one that compares favorably with pretty much anything made today at a mere fraction of the cost. (Well, now anyway. Jul 11, 2018 · RSS. ak6ok. (@ak6ok) Member Admin. I just upgraded a customers TS-940 with a new power supply kit and on testing the receive sensitivity, found that the receiver only responds to signals greater than about 1mv. The attenuator works fine, and the transmitter works well. Just a really numb receiver. Where is the best place to start? Key Features of the Kenwood TS -890S HF + 6M Transceiver: • 160-6 meters 100W All Modes • Full Down-Conversion Superheterodyne • Extra-low phase noise Local Oscillator • Built-in Roofing Filters, 15 kHz, 6 kHz, 2.7 kHz, and 500 Hz (270 Hz optional) • 7 inch TFT color display • High-speed Independent Band Scope • Animated Meter ... Mar 24, 1997 · I have a problem with my TS-940 and was wondering if anyone else has had it. All the frequency digits change from numbers to decimal points. If the frequency is changed, the correct display will appear but return to Decimal Points within 2 seconds. It appears most controls that are read by the processor will make this happen. Kenwood TS940 repair notes: low power output, low RX sensitivity. By Pedro M.J. Wyns ON7WP – AA9HX (email: [email protected] rl.net) These repair suggestions might also apply to the TS930 and TS950 sharing certain circuits. I received a virtually dead TS940 from Clarence Jones who suspected dead drivers as this is TS Test equipment FREQ. C FREQ. C SSG SCOPE DC V.M Unit PLI- LCD Digital Terminal TP5 0-1 ALC VCI VC2 Unit PLI- PLL PLL CONT sw Part L5—6 1.7 1.17, 18, 20—24 TCI VR3 VR13 1.65 1.68 1.71 VRI VR2 Method ADJ 1.5 and 1.6 for MAX. ADJ to 8V at 40.399.00MHz. ADJ to MAX. Receive the 1 OMHz and make the zero beet waveform as shown at right. (HET ... Old Ham Dave is David Lyndon, professional electrical engineer and extra class amateur AK4AA, well-qualified to repair, align, and refurbish amateur radio equipment using laboratory quality test equipment. Dave's specialty is the Kenwood "hybrid" transceivers, the TS-520 through TS-830S, plus solid state transceivers TS-930S and TS-940S.Receive audio mods to improve audio quality: TS-520: Service notes: TS-520S: CW frequency shift. Power supply failure, -6VDC. CW filter select control: TS-530S: Low voltage supply optional improvements. IF unit Q2-Q7 protection: TS-690S: Extend RF tuning range: TS-700A: ... TS-940S: LCD clock display erratic operation. PLL unlock. PLL Unlock ...Expanded xmit for Kenwood TS-940S 1. From CT1APV 2. 3.Unplug all external radio connections. Remove top and bottom covers. 4.Remove 4 screws holding the faceplate to the chassis on the right and left side of the faceplate. Gently pull the face away from the chassis about an inch for working room, but don't unplug anything.Key Features of the Kenwood TS -890S HF + 6M Transceiver: • 160-6 meters 100W All Modes • Full Down-Conversion Superheterodyne • Extra-low phase noise Local Oscillator • Built-in Roofing Filters, 15 kHz, 6 kHz, 2.7 kHz, and 500 Hz (270 Hz optional) • 7 inch TFT color display • High-speed Independent Band Scope • Animated Meter ... The Output Power (as read on B&W meter) varies in two ways: 1. With the key down the power is not constant but jumps around a few watts. 2. On first key down at a given frequency, the output reads, for example, 27 watts and then creeps up to 30 watts over the next 3 or 4 seconds. On second key down the output reads 30 watts straight away.Put the covers back on the TS-940S and secure them with the 16 case screws. Connect the antenna and power cord then test the transceiver for normal operation. This is an optional change and may not be performed under warranty. Time required for this change is 1 hour or less. TS-940S erratic display. See the FETs Q10 (RF Preamp RF Pream p 2SK125, N-FET, 25V, 0.1A, 0.3 W) and Q4 Q5 (2nd balanced mixer, also 2SK125). The picture above was scanned from the TS-940S Service Manual, Revised Edition. In these pictures the FETs are in the wrong position. I can assume that thousands of other TS-940S are also waiting to be corrected and perform. 4.9. N5OP. Rating: 2020-10-25. An Excellent Rig, Especially When Updated. Time Owned: more than 12 months. I've had my TS-930S since 1984, purchased new. It has the full compliment of filters plus the INRAD roofing filter. I have updated the power supply with the W6NL mods and replaced all the PS capacitors. Mar 24, 1997 · I have a problem with my TS-940 and was wondering if anyone else has had it. All the frequency digits change from numbers to decimal points. If the frequency is changed, the correct display will appear but return to Decimal Points within 2 seconds. It appears most controls that are read by the processor will make this happen. The TS-940 is a triple conversion receiver design, so If you can hear a signal at all, the receive circuitry is working, but your sensitivity is low, which typically indicates the problem is right at the antenna input. Loss of Xmit mode on TS-940S. 24 Sep 2009. Replacement lcd lamp for the clock display for TS-940. 04 Apr 2009. Kenwood TS940 repair notes: Low power output and low sensitivity. 04 Jan 2009. Intermittent RX sensitivity / Bad Solder joints on RF Board for TS-940. 18 Aug 2008.Get the best deals for kenwood ts-940sat ts-940s low voltage transformer transformer only at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items! 1982 TS-930 The world's first Ham Radio HF transceiver equipped with a built-in automatic antenna tuner. 1985 TS-940 This HF transceiver offered the high dynamic range that won the struggle through the Cycle 22 pile-up. 1989 TS-950 Another world's first, this HF transceiver came standard with a built-in DSP. External SpeakerSP-990 Input:5 WTS940 service manual (4.7MB) which is in PDF format. Before making any tests on either board it is best to check that the supply voltages are correct. On the PLL board connector 5 pin 5 should be +5V and pin 3, +15V. Each individual phase lock loop produces a permanent voltage of around +4.75V if it is in lock and just above 0V if it is out ofBuy American Act. The Buy American Act is a complex government regulation which could require legal assistance to understand fully. The simplest answer is that, in order to participate in a government or public works project, the materials and finished goods you source must be manufactured in the U.S. or, if the dollar value of the contract is high enough, one of 70+ foreign countries with ...INSTRUCTION MANUAL HF TRANSCEIVER Model TS-940S NOTES: 1. If the timer switch is set to ON, the unit sometimes does not function even when the POWER switch is set to ON. 2. When the squelch is not in use, turn the SQL control fully counterclockwise. If the control is turned fully clockwise, the reception sound sometimes cannot be heard,The TS-940 is a triple conversion receiver design, so If you can hear a signal at all, the receive circuitry is working, but your sensitivity is low, which typically indicates the problem is right at the antenna input. Mar 25, 2017 · $59.00 End Date: Sunday Mar-26-2017 16:13:08 PDT Buy It Now for only: $59.00 Buy It Now | Add to watch list Continue reading... I had my TS-940 in storage for almost 10 years after retiring, and relocating to a new QTH. I acquired a K3 as my main transceiver, with plans to restore the 940 at some point. When I decided it was time to get the 940 out of storage and back into operation, I planned to recap the power supply and add a crowbar protection circuit. This item: Kenwood MC-43S Hand Microphone, 8-Pin Round for The TS-940 $87.44 RG8x Coaxial Cable, CB Coax Cable, 50ft UHF PL259 Male to Male Low Loss CB Antenna Cables, 50 Ohm for HAM Radio, Antenna Analyzer $38.99 Maxmoral 2-Pack PL-259 UHF Female to UHF Female Coax Cable Adapter S0-239 UHF Double Female Connector Plug $7.99 ($4.00/Count)The TS-940S receiver covers from 1 50 kHz to 30 MHz. to receive international broadcast and communication ser- vices. As shown in the Frequency Allocation Chart, above figure, broadcast and Amateur radio station frequencies are allo- cated in specific bands expressed in megahertz (MHz) or wavelength in meters (m). Also in the above figure the fre- Technical Questions Q&A Page 1. I will be adding to these as time permits, as I have over four years worth, after all! You can either read through the emails page-by-page (like a novel!), or search the site for keywords which will lead you directly to your area of interest. ENJOY! Ken, K4EAA. #129 Kenwood TS 940 Low Receive Kenwood TS-990 Review and Quick Tour - Pascal VA2PV #75 Ham Radio repair: Kenwood TS-850 S local board with leaking capacitors #250: ... PE9M's Kenwood TS-940S Mega reparacion kenwood ts 830s gold Page 3/7. Read Free Kenwood Ts 830s Manual label PE9M's KENWOOD TS-830S in HDV Kenwood TS530S HFJul 11, 2018 · RSS. ak6ok. (@ak6ok) Member Admin. I just upgraded a customers TS-940 with a new power supply kit and on testing the receive sensitivity, found that the receiver only responds to signals greater than about 1mv. The attenuator works fine, and the transmitter works well. Just a really numb receiver. Where is the best place to start? Oct 29, 2009 · IC 3 as used in the stock TS-940S introduces both high frequency and low frequency limitations do to the original caps used. C200 and C203 form a high frequency negative feedback loop that kills everything above 3 kHz. C202 and C207 are bypassing caps for internal transistors in IC 3. Replacing them fills out the low end. Sep 09, 2015 · Phase 6 : 2015 October Shack joined by HF all-band, all-mode, Kenwood TS-940SAT with SP-940 speakers (behind the 3 boom microphones) Both Original Instruction and Service manuals in very good condition. 09/10/2015 Update: For some reason the sub-display started to work. To use low gain transistors, or to use high gain transistors (different dot colors) and modify the bias, etc. kenwood ts 590s group there is a picture in the file section , modification kenwood ts 590s kenwood ts 590s ts 590 s mars cap mods, ts 590s contents i at. Kenwood TS-940 Power Supply Voltage Regulation. 1 post • Page:1 of 1. Plus, in my opinion, an aging TS-940S is still well worth the trouble of contact cleaning, Molex grooming and solder trace re-flowing. Once it's working properly again, you'll have one of the best HF rigs ever made; one that compares favorably with pretty much anything made today at a mere fraction of the cost. (Well, now anyway. Oct 29, 2009 · IC 3 as used in the stock TS-940S introduces both high frequency and low frequency limitations do to the original caps used. C200 and C203 form a high frequency negative feedback loop that kills everything above 3 kHz. C202 and C207 are bypassing caps for internal transistors in IC 3. Replacing them fills out the low end. Kenwood TS940 repair notes: low power output, low RX sensitivity. By Pedro M.J. Wyns ON7WP – AA9HX (email: [email protected] rl.net) These repair suggestions might also apply to the TS930 and TS950 sharing certain circuits. I received a virtually dead TS940 from Clarence Jones who suspected dead drivers as this is TS940 service manual (4.7MB) which is in PDF format. Before making any tests on either board it is best to check that the supply voltages are correct. On the PLL board connector 5 pin 5 should be +5V and pin 3, +15V. Each individual phase lock loop produces a permanent voltage of around +4.75V if it is in lock and just above 0V if it is out ofLU7BSE Rating: 2022-08-17; It has no rival, it is UNIQUE, THE BEST Time Owned: more than 12 months. Build quality, audio quality, unsurpassed receiver, ESSB ready frequency stability, and so I could write a book talking about this Kenwood engineered machine, I had 2 of these and I have among others the ts 990, just this it has its place and only those who had or have a 950sdx know what they ... Low Frequency Output: More than 1.5 Watts 8 ohms at 10% distortion: Notch Filter Reduction: More than 30 dB (1 kHz) RIT Variable Range: ±20.00 kHz: Selectivity Main: SSB Low (300MHz) SSB Hi (2600 MHz) AM Low (100 MHz) AM Hi (3000 MHz) FM FM Narrow Sub: AM FM: More than 2.2 kHz (-6 dB) Less than 4.4 kHz (-60 dB) More than 6.0 kHz (-6 dB) Less ...The TS-940S receiver covers from 1 50 kHz to 30 MHz. to receive international broadcast and communication ser- vices. As shown in the Frequency Allocation Chart, above figure, broadcast and Amateur radio station frequencies are allo- cated in specific bands expressed in megahertz (MHz) or wavelength in meters (m). Also in the above figure the fre- Technology drives the development of Ham Radio just as it does Kenwood's Professional Mobile Radio and the latest Kenwood HF flagship transceiver, the TS-990S, features touch-screen tuning, full down-conversion receive and can be operated remotely over the Internet. A NEW universal PA replacement for the TS-930 and TS-940. Simply install this board in replacement of your original PA board. We are taking $0 pre-orders for these at $299! Estimated shipping time is mid October - Click on the Pre-order link below or email to [email protected] Pre-order Yours! TS for Amateur Station radios. TK / TKB / TKR-6xx and 6xxx seem to be low band, TK / TKB / TKR-7xx and 7xxx seem to be VHF-highband, TK / TKB / TKR-8xx and 8xxx seem to be UHF. TKR-9xx for 900 MHz repeaters. Kenwood 900 MHz Information has been moved to a separate page. Kenwood TKR Repeater Information has been moved to a separate page. General ...Jul 11, 2018 · RSS. ak6ok. (@ak6ok) Member Admin. I just upgraded a customers TS-940 with a new power supply kit and on testing the receive sensitivity, found that the receiver only responds to signals greater than about 1mv. The attenuator works fine, and the transmitter works well. Just a really numb receiver. Where is the best place to start? Oct 29, 2009 · IC 3 as used in the stock TS-940S introduces both high frequency and low frequency limitations do to the original caps used. C200 and C203 form a high frequency negative feedback loop that kills everything above 3 kHz. C202 and C207 are bypassing caps for internal transistors in IC 3. Replacing them fills out the low end. Power supply: One 9 Volt battery or External DC 9 Volt AC Adapter (Center-Negative) 40TH Anniversary Ruby Finish Limited Edition. Classic stompbox overdrive effect. Growling overdrive with excellent touch sensitivity. Wide range of tones from 3 simple controls. Features red translucent knobs and a high-intensity red LED.Tigertronics SignaLink USB for Kenwood 13-Pin DIM Accessory Port Connector Features: FCC Certified - Unlike many competitors, the SignaLink USB has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.; Built-in Low Noise Sound Card - This provides optimum performance and frees your computer's existing sound card for other uses.Mar 25, 2017 · $59.00 End Date: Sunday Mar-26-2017 16:13:08 PDT Buy It Now for only: $59.00 Buy It Now | Add to watch list Continue reading... Another TS-940 Issue. Is it a bad component? Poor solder joint?, Gremlins? No, it something even more sinister in this radio. One of the 10 zillion conne... The TS-940S receiver covers from 1 50 kHz to 30 MHz. to receive international broadcast and communication ser- vices. As shown in the Frequency Allocation Chart, above figure, broadcast and Amateur radio station frequencies are allo- cated in specific bands expressed in megahertz (MHz) or wavelength in meters (m). Also in the above figure the fre-The TS-940S receiver covers from 1 50 kHz to 30 MHz. to receive international broadcast and communication ser- vices. As shown in the Frequency Allocation Chart, above figure, broadcast and Amateur radio station frequencies are allo- cated in specific bands expressed in megahertz (MHz) or wavelength in meters (m). Also in the above figure the fre- I had purchased my Ts-940 about 3 years ago and received with it the reviced service manual and several service bulletins from the mid to late 80's about performance enhancements, reviews etc. Back then, I had spent considerable time implementing all the recommended mods as well as other "exotic" improvements like the ultra-low op amp ... Jul 11, 2018 · RSS. ak6ok. (@ak6ok) Member Admin. I just upgraded a customers TS-940 with a new power supply kit and on testing the receive sensitivity, found that the receiver only responds to signals greater than about 1mv. The attenuator works fine, and the transmitter works well. Just a really numb receiver. Where is the best place to start? The station has had many iterations over the years, right now its a Kenwood TS-890, Kenwood 2000, a Kenwood TS-940 and a Collins KWM-2. I have an Alpha 91b amp, a Collins 30L1 and a Harris Platinium Broadcast Amp for 6 meters. Recently a good friend became a silent key and I acquired his Yaesu FTDX101MP, WOW what a radio.Kenwood TS940 repair notes: low power output, low RX sensitivity. By Pedro M.J. Wyns ON7WP – AA9HX (email: [email protected] rl.net) These repair suggestions might also apply to the TS930 and TS950 sharing certain circuits. I received a virtually dead TS940 from Clarence Jones who suspected dead drivers as this is The TS-940S receiver covers from 1 50 kHz to 30 MHz. to receive international broadcast and communication ser- vices. As shown in the Frequency Allocation Chart, above figure, broadcast and Amateur radio station frequencies are allo- cated in specific bands expressed in megahertz (MHz) or wavelength in meters (m). Also in the above figure the fre- May 04, 2021 · A few months ago, someone posted about their TS-940 losing receive, or shutting off, relays chattering then coming back. I don't remember who it was but I asked for info if they found the solution. TS-940S. With the so-I installed, overall frequency stability is upgraded to a level approximating professional standards. stability (receive 14.1 MHz) Phase Locked Loop (PLL) Circuit This is a digital Variable Frequency Oscillator (VFO) covering 45.2—75.05 MHz in 10 Hz steps, in accordance with the TS-940S operating frequency of 150 kHz to ... I had my TS-940 in storage for almost 10 years after retiring, and relocating to a new QTH. I acquired a K3 as my main transceiver, with plans to restore the 940 at some point. When I decided it was time to get the 940 out of storage and back into operation, I planned to recap the power supply and add a crowbar protection circuit. I had my TS-940 in storage for almost 10 years after retiring, and relocating to a new QTH. I acquired a K3 as my main transceiver, with plans to restore the 940 at some point. When I decided it was time to get the 940 out of storage and back into operation, I planned to recap the power supply and add a crowbar protection circuit. Transceiver, HF/50 MHz, 100W, Advanced Performance Receiver, Incl. 4 Filters, DSP, 7 in. TFT Color Display, Ext. DVI, LAN, USB & Serial, ATU, 13.8 Vdc Part Number: KWD-TS-890S ( 22 ) Estimated Ship Date: Today Documentation Multiple Images View Instant Rebate $4,329.99 $4,929.99 (Save $600.00) Add To Cart Compare Wish List 1Another TS-940 Issue. Is it a bad component? Poor solder joint?, Gremlins? No, it something even more sinister in this radio. One of the 10 zillion conne... See the FETs Q10 (RF Preamp RF Pream p 2SK125, N-FET, 25V, 0.1A, 0.3 W) and Q4 Q5 (2nd balanced mixer, also 2SK125). The picture above was scanned from the TS-940S Service Manual, Revised Edition. In these pictures the FETs are in the wrong position. I can assume that thousands of other TS-940S are also waiting to be corrected and perform. Features | Accessories | View Larger | Rear Panel The Kenwood TS-950S is a competition class HF transceiver with advanced digital processing while remaining very user-oriented. It is designed for critical applications in SSB, CW, AM, FM and FSK on all HF amateur bands including the WARC bands with 150 watts input (40 watts AM). Operates on 120 VAC.Jul 11, 2018 · RSS. ak6ok. (@ak6ok) Member Admin. I just upgraded a customers TS-940 with a new power supply kit and on testing the receive sensitivity, found that the receiver only responds to signals greater than about 1mv. The attenuator works fine, and the transmitter works well. Just a really numb receiver. Where is the best place to start? TS-940S. Unlike its hybrid predecessors, the Kenwood TS-940S is an all solid state HF transceiver with an optional built in automatic antenna tuner (AT). It transmits on the amateur radio bands from 160 to 10 meters including the WARC bands and is also a general coverage receiver from 150 kHz to 30 MHz. Its modes of operation are CW, SSB, AM, FSK, and narrow-band FM. Some radios provide only low level (100 mv typ.) audio output. This level is not nearly enough for the BayPac to receive properly. ... This radio does not receive as well as some others on packet. The problem is that the radio's audio frequency response rolls off too soon and distorts the high tone. ... TS-780, TS-790, TS-811, TS-850, TS-930 ...I compared the receive audio or signal level between my Flex 6300 software defined radio and my TS-940. For a signal on 20 and 40 meters that is over S9 on the 6300's S-meter, the TS-940S has a much lower signal to noise ratio or audio level with the S-meter barely moving. Get the best deals for kenwood ts-940sat ts-940s low voltage transformer transformer only at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items! 3) Tuned the TS-940 to this test signal, peaking the carrier reception in USB mode, and recording the maximum S-meter reading. Note that I moved the radio around a bit to ensure that the reading was stable and repeatable, and not sensitive to relative position. 4) Shut off the test source so as not to deplete the battery while working on the radio.I paid about $350 for my TS -940SAT several years ago. Initially, a great deal of cleaning and some servicing had to be done to get the radio completely up to snuff -- battling the intermittent"dreaded dots" problem and such. TS-940. I found several solder joints that were fractured. All the bad joints were in the areas where the PLL had WAX poured in to keep down microphonics. The reason for the failures appears to be from several things. The lead diameter to hole diameter is large for a solder flow process. After lookingThe station has had many iterations over the years, right now its a Kenwood TS-890, Kenwood 2000, a Kenwood TS-940 and a Collins KWM-2. I have an Alpha 91b amp, a Collins 30L1 and a Harris Platinium Broadcast Amp for 6 meters. Recently a good friend became a silent key and I acquired his Yaesu FTDX101MP, WOW what a radio.The TS-940S receiver covers from 1 50 kHz to 30 MHz. to receive international broadcast and communication ser- vices. As shown in the Frequency Allocation Chart, above figure, broadcast and Amateur radio station frequencies are allo- cated in specific bands expressed in megahertz (MHz) or wavelength in meters (m). Also in the above figure the fre- 18.5 Kg (40.79 lb) 20 Kg (44.1 lb), with AT- 940 Other features: Dual Noise Blankers. VOX. Attenuator. 24 hr clock and timer. Notch filter. RECEIVER SECTION Receiver system: Triple conversion superheterodyne (FM) 1st IF: 45.05 MHz 2nd IF: 8.83 MHz 3rd IF: 455 KHz Quadruple conversion superheterodyne (AM/SSB/CW/FSK) 1st IF: 45.05 MHz 2nd IF: 8.83 MHz. Oct 29, 2009 · IC 3 as used in the stock TS-940S introduces both high frequency and low frequency limitations do to the original caps used. C200 and C203 form a high frequency negative feedback loop that kills everything above 3 kHz. C202 and C207 are bypassing caps for internal transistors in IC 3. Replacing them fills out the low end. LU7BSE Rating: 2022-08-17; It has no rival, it is UNIQUE, THE BEST Time Owned: more than 12 months. Build quality, audio quality, unsurpassed receiver, ESSB ready frequency stability, and so I could write a book talking about this Kenwood engineered machine, I had 2 of these and I have among others the ts 990, just this it has its place and only those who had or have a 950sdx know what they ... Another TS-940 Issue. Is it a bad component? Poor solder joint?, Gremlins? No, it something even more sinister in this radio. One of the 10 zillion conne... I'm having a problem with my Kenwood TS-940S, in that I can receive signals, but they are rather weak sounding and my s-meter does not deflect to show their signal strengths. Sometimes, however, the signals sound great and the s-meter does work properly. And other times it takes a station with a 20db-over signal to move the s-meterI compared the receive audio or signal level between my Flex 6300 software defined radio and my TS-940. For a signal on 20 and 40 meters that is over S9 on the 6300's S-meter, the TS-940S has a much lower signal to noise ratio or audio level with the S-meter barely moving. Aug 19, 2021 · Most of the problems in Kenwood TS 940 appear due to the presence of low-quality components used in it and bad soldering done with those components. Changing the external capacitor of the device Sometimes your radio is not working properly due to a small-sized capacitor being installed in it. Sun Optics H&K 300 Mount SM4300. Color: Black Finish: Satin Black Fabric/Material: Aircraft Grade Aluminum Quantity: each Gun Make: Heckler & Koch Length: 6 in Width: 1 in Weight: 0 - 0.49 grain, 4 oz Additional Features: NO GUNSMITHING MOUNT Included Accessories: Installation Tools. Code: 86-MT-SM4300. MPN: SM4300. UPC: 812649011541.Oct 02, 2021 · Kenwood TS-940S Power Supply AVR Board US/75. Availability: Immediate. Handling time: 8 Days. Fast Shipping. This is a special own stock item. When you complete your order, we will ship in 8 days. Delivery time: Courier Europe 5 days, America 7 days, USA and Canada 5 days. Payments: Credit, Debit Accept Also PayPal, Zelle. TS-940S. With the so-I installed, overall frequency stability is upgraded to a level approximating professional standards. stability (receive 14.1 MHz) Phase Locked Loop (PLL) Circuit This is a digital Variable Frequency Oscillator (VFO) covering 45.2—75.05 MHz in 10 Hz steps, in accordance with the TS-940S operating frequency of 150 kHz to ... TS-940. I found several solder joints that were fractured. All the bad joints were in the areas where the PLL had WAX poured in to keep down microphonics. The reason for the failures appears to be from several things. The lead diameter to hole diameter is large for a solder flow process. After lookingTS-940S ALIGNMENT INSTRUCTIONS TRIO-KENWOOD CORPORATION OPRINTED IN JAPAN B50-8048-OO(K, M, W, X) ... Output : 1 m V or less to 1 V, low distortion AF Dummy Load I) Impedance . 80 2) Dissipation . 3W or greater Oscilloscope (SCOPE) ... Receive the 1 OMHz and make the zero beet waveform as shown at right. (HET : 36220.000 MHz) ConfirmSun Optics H&K 300 Mount SM4300. Color: Black Finish: Satin Black Fabric/Material: Aircraft Grade Aluminum Quantity: each Gun Make: Heckler & Koch Length: 6 in Width: 1 in Weight: 0 - 0.49 grain, 4 oz Additional Features: NO GUNSMITHING MOUNT Included Accessories: Installation Tools. Code: 86-MT-SM4300. MPN: SM4300. UPC: 812649011541.TS-940S. With the so-I installed, overall frequency stability is upgraded to a level approximating professional standards. stability (receive 14.1 MHz) Phase Locked Loop (PLL) Circuit This is a digital Variable Frequency Oscillator (VFO) covering 45.2—75.05 MHz in 10 Hz steps, in accordance with the TS-940S operating frequency of 150 kHz to ... Audio mod for Kenwood TS-940s « on: May 25, 2017, 09:30:41 PM. Super hohe von blicke. Kenwood TS-940/TS-930 Supply Upgrade Project After being a Ham for over 50 years, I have finally decided that one of the best transceivers ever made is the Kenwood TS-940. 03-12-2008. (PDF creation and download available courtesy W5CUL and.Another TS-940 Issue. Is it a bad component? Poor solder joint?, Gremlins? No, it something even more sinister in this radio. One of the 10 zillion conne... Mar 24, 1997 · I have a problem with my TS-940 and was wondering if anyone else has had it. All the frequency digits change from numbers to decimal points. If the frequency is changed, the correct display will appear but return to Decimal Points within 2 seconds. It appears most controls that are read by the processor will make this happen. Low Receiver Sensitivity Monitor function does not work on SSB and/or CW, or is very distorted. No transmit audio on FM. Noise Blanker Performance Improvement. Passband tuning erratic while on SSB, okay on CW. People tell me I am off frequency. Poor solder connections. Prevent Static Buildup (and a warning) Radio stuck in send mode - no receive.I received a virtually dead TS940 from Clarence Jones who suspected dead drivers as this is defect number one with this type of radio. I previously published an article on how to replace these MRF485 transistor by Mosfets. Unfortunately the transistors were still ok, as well as the finals and the predriver.Re: #18 Kenwood TS 940 DOT on display Chasing down the rabbit hole Pt 1. « Reply #6 on: December 30, 2015, 02:20:06 pm ». Hi, just following your thread. So it looks like you got power back to the displays which has stopped the flashing digits problem. You repaired many dry joints (cold joints) on the board but still have an 'unlock ...The most common problem that most of the Kenwood TS 940 users face is that the frequency is displayed in dots on the screen. The most predictable reason behind it is that it is due to the lock loops being displaced from their position. One way to solve this issue is by removing all the solder present in the parts of lock loops.Receive Range 1: .030-60.000 MHz Receive System: Single receiver Dual Watch: No Roofing Filter Capability: Yes Roofing Filter Bandwidth: 15kHz, 6kHz, 2.7kHz, 500Hz (Opt. 270Hz) Transceiver Power Supply: External, not included Transceiver Input Voltage: 13.8 Vdc Transceiver Maximum Current: 22.0 A Antenna Ports: 3 Dedicated Receive Antenna Input:Plus, in my opinion, an aging TS-940S is still well worth the trouble of contact cleaning, Molex grooming and solder trace re-flowing. Once it's working properly again, you'll have one of the best HF rigs ever made; one that compares favorably with pretty much anything made today at a mere fraction of the cost. (Well, now anyway. The TS-940 is a triple conversion receiver design, so If you can hear a signal at all, the receive circuitry is working, but your sensitivity is low, which typically indicates the problem is right at the antenna input. Nelson Ricardo, PY1NR, has repositioned the SK125 semi-conductors/transistors of his TS-940S that caused the low sensitifity of its Rx. After he fixed it he claimed that his rig's Rx gained 10 dB or more. Bingo! I thought that this was the answer to my curiosity. PY1NR recommended voltage measurements before and after correction.most new amplifiers will go into a fault-protective mode if rf energy is present on their input connector during the off-to-on transition of their send relay; because of the qsk nature of the ts-940, and a relatively slow transmit-receive (t-r) relay internal to the radio, this issue is very likely to occur when it is interfaced to modern …TS Test equipment FREQ. C FREQ. C SSG SCOPE DC V.M Unit PLI- LCD Digital Terminal TP5 0-1 ALC VCI VC2 Unit PLI- PLL PLL CONT sw Part L5—6 1.7 1.17, 18, 20—24 TCI VR3 VR13 1.65 1.68 1.71 VRI VR2 Method ADJ 1.5 and 1.6 for MAX. ADJ to 8V at 40.399.00MHz. ADJ to MAX. Receive the 1 OMHz and make the zero beet waveform as shown at right. (HET ... Mar 24, 1997 · I have a problem with my TS-940 and was wondering if anyone else has had it. All the frequency digits change from numbers to decimal points. If the frequency is changed, the correct display will appear but return to Decimal Points within 2 seconds. It appears most controls that are read by the processor will make this happen. #129 Kenwood TS 940 Low Receive Posted by Unknown at 3:28 PM. Email This BlogThis! Share to Twitter Share to Facebook Share to Pinterest. No comments: Post a Comment. LU7BSE Rating: 2022-08-17; It has no rival, it is UNIQUE, THE BEST Time Owned: more than 12 months. Build quality, audio quality, unsurpassed receiver, ESSB ready frequency stability, and so I could write a book talking about this Kenwood engineered machine, I had 2 of these and I have among others the ts 990, just this it has its place and only those who had or have a 950sdx know what they ... Get the best deals for kenwood ts-940sat ts-940s low voltage transformer transformer only at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Key Features of the Kenwood TS -890S HF + 6M Transceiver: • 160-6 meters 100W All Modes • Full Down-Conversion Superheterodyne • Extra-low phase noise Local Oscillator • Built-in Roofing Filters, 15 kHz, 6 kHz, 2.7 kHz, and 500 Hz (270 Hz optional) • 7 inch TFT color display • High-speed Independent Band Scope • Animated Meter ... A COMPENDIUM OF INFORMATION ON REPAIRING YOUR OWN KENWOOD TS-930S TRANSCEIVER (MUCH OF WHICH SHOULD APPLY TO THE TS-940S AS WELL) By John P. Young, W3AFC Rev. 7: 02/18/2017 Contributors (To date, in order of appearance) Gary J. Mankhoff, N6BIZ Mike Hutchins, ZL1MH Dave Phillips, KB7JS Marcel De Vuyst, ON7DY Luis Velazquez, K4BTA Sep 09, 2015 · Phase 6 : 2015 October Shack joined by HF all-band, all-mode, Kenwood TS-940SAT with SP-940 speakers (behind the 3 boom microphones) Both Original Instruction and Service manuals in very good condition. 09/10/2015 Update: For some reason the sub-display started to work. I had my TS-940 in storage for almost 10 years after retiring, and relocating to a new QTH. I acquired a K3 as my main transceiver, with plans to restore the 940 at some point. When I decided it was time to get the 940 out of storage and back into operation, I planned to recap the power supply and add a crowbar protection circuit. The TS-940S receiver covers from 1 50 kHz to 30 MHz. to receive international broadcast and communication ser- vices. As shown in the Frequency Allocation Chart, above figure, broadcast and Amateur radio station frequencies are allo- cated in specific bands expressed in megahertz (MHz) or wavelength in meters (m). Also in the above figure the fre- Aug 19, 2021 · Most of the problems in Kenwood TS 940 appear due to the presence of low-quality components used in it and bad soldering done with those components. Changing the external capacitor of the device Sometimes your radio is not working properly due to a small-sized capacitor being installed in it. Some radios provide only low level (100 mv typ.) audio output. This level is not nearly enough for the BayPac to receive properly. ... This radio does not receive as well as some others on packet. The problem is that the radio's audio frequency response rolls off too soon and distorts the high tone. ... TS-780, TS-790, TS-811, TS-850, TS-930 ...See the FETs Q10 (RF Preamp RF Pream p 2SK125, N-FET, 25V, 0.1A, 0.3 W) and Q4 Q5 (2nd balanced mixer, also 2SK125). The picture above was scanned from the TS-940S Service Manual, Revised Edition. In these pictures the FETs are in the wrong position. I can assume that thousands of other TS-940S are also waiting to be corrected and perform. Receive Range 1: .030-60.000 MHz Receive System: Single receiver Dual Watch: No Roofing Filter Capability: Yes Roofing Filter Bandwidth: 15kHz, 6kHz, 2.7kHz, 500Hz (Opt. 270Hz) Transceiver Power Supply: External, not included Transceiver Input Voltage: 13.8 Vdc Transceiver Maximum Current: 22.0 A Antenna Ports: 3 Dedicated Receive Antenna Input:To use low gain transistors, or to use high gain transistors (different dot colors) and modify the bias, etc. kenwood ts 590s group there is a picture in the file section , modification kenwood ts 590s kenwood ts 590s ts 590 s mars cap mods, ts 590s contents i at. Kenwood TS-940 Power Supply Voltage Regulation. 1 post • Page:1 of 1. TS-940S. With the so-I installed, overall frequency stability is upgraded to a level approximating professional standards. stability (receive 14.1 MHz) Phase Locked Loop (PLL) Circuit This is a digital Variable Frequency Oscillator (VFO) covering 45.2—75.05 MHz in 10 Hz steps, in accordance with the TS-940S operating frequency of 150 kHz to ... Expanded xmit for Kenwood TS-940S 1. From CT1APV 2. 3.Unplug all external radio connections. Remove top and bottom covers. 4.Remove 4 screws holding the faceplate to the chassis on the right and left side of the faceplate. Gently pull the face away from the chassis about an inch for working room, but don't unplug anything.Re: #18 Kenwood TS 940 DOT on display Chasing down the rabbit hole Pt 1. « Reply #6 on: December 30, 2015, 02:20:06 pm ». Hi, just following your thread. So it looks like you got power back to the displays which has stopped the flashing digits problem. You repaired many dry joints (cold joints) on the board but still have an 'unlock ...The relays are large,heavy-duty Tyco D2n style, with AgNI gold covered contacts, rated 3A, 250VAC, with excellent low current characteristics. Thay are rated for 15,000,000 mechanical operations and 2,000,000 electrical operations at 6V 100ma - Close to our use! See how to locate, diagnose, and test your relay, here on the RL-1 Page.most new amplifiers will go into a fault-protective mode if rf energy is present on their input connector during the off-to-on transition of their send relay; because of the qsk nature of the ts-940, and a relatively slow transmit-receive (t-r) relay internal to the radio, this issue is very likely to occur when it is interfaced to modern …Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted. Review Summary For : Kenwood TS-930S ... Just acquired a low mileage 7 mill s/n 930s after years of wanting one. ... all MRF485s in both the TS-930 and TS-940 are unsafe. So they will all break down sooner or later ...See the FETs Q10 (RF Preamp RF Pream p 2SK125, N-FET, 25V, 0.1A, 0.3 W) and Q4 Q5 (2nd balanced mixer, also 2SK125). The picture above was scanned from the TS-940S Service Manual, Revised Edition. In these pictures the FETs are in the wrong position. I can assume that thousands of other TS-940S are also waiting to be corrected and perform. TS-940S ALIGNMENT INSTRUCTIONS TRIO-KENWOOD CORPORATION OPRINTED IN JAPAN B50-8048-OO(K, M, W, X) ... Output : 1 m V or less to 1 V, low distortion AF Dummy Load I) Impedance . 80 2) Dissipation . 3W or greater Oscilloscope (SCOPE) ... Receive the 1 OMHz and make the zero beet waveform as shown at right. (HET : 36220.000 MHz) ConfirmKey Features of the Kenwood TS -890S HF + 6M Transceiver: • 160-6 meters 100W All Modes • Full Down-Conversion Superheterodyne • Extra-low phase noise Local Oscillator • Built-in Roofing Filters, 15 kHz, 6 kHz, 2.7 kHz, and 500 Hz (270 Hz optional) • 7 inch TFT color display • High-speed Independent Band Scope • Animated Meter ... Owner bought the spare board thinking the fault was there but he swapped it and found it did not help. The rig came also with an optional AM filter (Kenwood 6kHz) but no extra CW filters. It was a 504xxxxxx serial number (so made in April 1984). At least it was not a first series model, which seems had more troubles. 2/10/2000The TS-940S receiver covers from 1 50 kHz to 30 MHz. to receive international broadcast and communication ser- vices. As shown in the Frequency Allocation Chart, above figure, broadcast and Amateur radio station frequencies are allo- cated in specific bands expressed in megahertz (MHz) or wavelength in meters (m). Also in the above figure the fre- 881Z76-7266-72. Lithium Battery. Not in stock. This part is available to order. Usually ships within 2 to 4 days *. $6.00. Kenwood. 881H04-7864-72.Yaesu ft-900 is a small, user-friendly transceiver whose weight is about 5 kg having a built-in antenna installed in it. It is the best digital converter having an output power of about a hundred watts. It has a perfect LCD display with a control panel are the front to adjust output power. Frequency tuning can easily be done using Yaesu ft-900 ...Dec 31, 2017 · An alternative method would be to narrow down the fault to a particular part of the board or boards as suggested below. In the case of the TS940 there are a total of 6 phase lock loops, any one of which could be out of lock and cause the 'DOT' problem. Only 4. are on the PLL board - the other 2 are on the CAR board. The TS-940 I.F. board has the 455K12. A CFJ455K5 is also one way to go but the K12 is much better. The SSB filter can also be replaced with a good old made in America Collins 3.1 kHz mechanical filter. Several case styles of these filters are not collectable and can be had at reasonable cost. Again check out EBAY.If the discharge tube was blown it might have gotten a voltage spike into the RF board. Check the attenuator relays and the resistors next to the relays. Those can go if there was a lightening strike near the antenna. Take a look at this video on Youtube: #129 Kenwood TS 940 Low Receive Watch later Watch on TS-940S ALIGNMENT INSTRUCTIONS TRIO-KENWOOD CORPORATION OPRINTED IN JAPAN B50-8048-OO(K, M, W, X) ... Output : 1 m V or less to 1 V, low distortion AF Dummy Load I) Impedance . 80 2) Dissipation . 3W or greater Oscilloscope (SCOPE) ... Receive the 1 OMHz and make the zero beet waveform as shown at right. (HET : 36220.000 MHz) ConfirmI take no responsibility for any damage you cause to your TS-440S. I assume you have excellent soldering skills and a good DMM. This is just a report on how I fixed my TS-440 with info directly from the Yahoo Group KENWOOD TS-440S. I am not a expert nor a certified Electrician. Just a average Ham like you who likes to learn. I take no credit ...The most common problem that most of the Kenwood TS 940 users face is that the frequency is displayed in dots on the screen. The most predictable reason behind it is that it is due to the lock loops being displaced from their position. One way to solve this issue is by removing all the solder present in the parts of lock loops.PC to TS Interface 1 K6XX Simple, Low Cost Interface Between Kenwood Serial Ports and Contest Logging Programs ... (TS-140, TS-440, TS-940, or later). Better yet, no external power supply is required. ... inverted), RXD (Receive Data, inverted), RTS (Ready To Send), and CTS (Clear to Send). For RFI isolation, Kenwood employs optoisolators and sepa-To use low gain transistors, or to use high gain transistors (different dot colors) and modify the bias, etc. kenwood ts 590s group there is a picture in the file section , modification kenwood ts 590s kenwood ts 590s ts 590 s mars cap mods, ts 590s contents i at. Kenwood TS-940 Power Supply Voltage Regulation. 1 post • Page:1 of 1. TS Test equipment FREQ. C FREQ. C SSG SCOPE DC V.M Unit PLI- LCD Digital Terminal TP5 0-1 ALC VCI VC2 Unit PLI- PLL PLL CONT sw Part L5—6 1.7 1.17, 18, 20—24 TCI VR3 VR13 1.65 1.68 1.71 VRI VR2 Method ADJ 1.5 and 1.6 for MAX. ADJ to 8V at 40.399.00MHz. ADJ to MAX. Receive the 1 OMHz and make the zero beet waveform as shown at right. (HET ... Remove the TOP cover. Remove the FOUR screws holding the AUTOMATIC ANTENNA TUNER. Place the transceiver on it's side with the BOTTOM towards you, and the FRONT to your LEFT. Being very careful, remove the antenna tuner and allow it to hang. Remove the TWO SCREWS that HOLD the AFSK INPUT board. Remove the FOUR SCREWS that HOLD the ACC 2 JACK board.In this video we look at a TS-940 with low receive. What we find appears to be lightning damage.Support us on Patreon;https://www.patreon.com/theradioshopCo... KENWOOD TS 940 ATT,AGC,METER SELECTOR SWITCH UNIT X41-160-A/13. $14.95 ... Kenwood TS-940S HF Transceiver X51-1330-00 Filter Unit Low Pass. Parts only Parts only Parts only. $32.67. ... opens in a new tab or window if you receive an item that is not as described in the listing.TS-850S Low/no Receive sensitivity TS-850S No audio from VS-2 TS-850S Mixer FET change TS-850S "Click noise" with NOTCH ON ... The voice is the same as the older VS-1 for the TS-440, and TS-940, but the unit is in a smaller package. It will speak the frequency in either English or Jápanese. There is a volume control pot on thePlus, in my opinion, an aging TS-940S is still well worth the trouble of contact cleaning, Molex grooming and solder trace re-flowing. Once it's working properly again, you'll have one of the best HF rigs ever made; one that compares favorably with pretty much anything made today at a mere fraction of the cost. (Well, now anyway. A NEW universal PA replacement for the TS-930 and TS-940. Simply install this board in replacement of your original PA board. We are taking $0 pre-orders for these at $299! Estimated shipping time is mid October - Click on the Pre-order link below or email to [email protected] Pre-order Yours!Technical Questions Q&A Page 1. I will be adding to these as time permits, as I have over four years worth, after all! You can either read through the emails page-by-page (like a novel!), or search the site for keywords which will lead you directly to your area of interest. ENJOY! 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