From cemilton at aol.com Sat Aug 4 18:59:37 2018 From: cemilton at aol.com (cemilton at aol.com) Date: Sat, 4 Aug 2018 18:59:37 -0400 Subject: [Kenwood] TS-50 problem Message-ID: <165072ae947-c89-14ad3@webjasstg-vaa48.srv.aolmail.net> I have a TS-50 that I recently brought back on line and found that everything worked...?.except the output power into a 50ohm dummy load was a whopping 200 watts. I immediately stopped, went to SSB mode and whistled up 200watts. A quick try in CW and AM produced the same results. I had this rig repaired a few years back by Clif @ AVVID. He put it in tip-top shape and I used it periodically afterward. Fast forward to now (3+ years later) when I got it from the closet and found the above described problem. It's been in a controlled environment and not subjected to humidity or high temperatures. I'm guessing an electrolytic has given up and the bias on the finals is in trouble. But that's only a guess. Anyone wish to comment? I'm not equipped to service it unless there is something obvious that doesn't require precision work. I'm one of the dinosaurs who is linked to BA gear where I still do my own repairs, etc. Thanks for the read. 73 de W4MIL Chuck ????? ???? From ne1s at securespeed.us Sat Aug 4 19:30:27 2018 From: ne1s at securespeed.us (Larry Szendrei) Date: Sat, 4 Aug 2018 19:30:27 -0400 Subject: [Kenwood] TS-50 problem In-Reply-To: <165072ae947-c89-14ad3@webjasstg-vaa48.srv.aolmail.net> References: <165072ae947-c89-14ad3@webjasstg-vaa48.srv.aolmail.net> Message-ID: Hi Chuck, I don't know much about the TS-50, but I'd be surprised if it's capable of 200W peak output. Are you sure your power meter is accurate? I've seen some fail in ways such that they read high. I'm a classic tube gear guy myself, and I know I've seen you on one or more of the lists that cater to that, to which we both belong. 73, -Larry/NE1S On 8/4/18 6:59 PM, chuck via Kenwood wrote: > I have a TS-50 that I recently brought back on line and found that everything worked...?.except the output power into a 50ohm dummy load was a whopping 200 watts. I immediately stopped, went to SSB mode and whistled up 200watts. A quick try in CW and AM produced the same results. > > I had this rig repaired a few years back by Clif @ AVVID. He put it in tip-top shape and I used it periodically afterward. Fast forward to now (3+ years later) when I got it from the closet and found the above described problem. It's been in a controlled environment and not subjected to humidity or high temperatures. > > I'm guessing an electrolytic has given up and the bias on the finals is in trouble. But that's only a guess. Anyone wish to comment? I'm not equipped to service it unless there is something obvious that doesn't require precision work. I'm one of the dinosaurs who is linked to BA gear where I still do my own repairs, etc. > > Thanks for the read. > > 73 de W4MIL > Chuck > From pa2a at xs4all.nl Sun Aug 5 03:27:45 2018 From: pa2a at xs4all.nl (Steef PA2A) Date: Sun, 05 Aug 2018 09:27:45 +0200 Subject: [Kenwood] TS-50 problem In-Reply-To: <165072ae947-c89-14ad3@webjasstg-vaa48.srv.aolmail.net> References: <165072ae947-c89-14ad3@webjasstg-vaa48.srv.aolmail.net> Message-ID: <18c31e01ab316c5424e74bac3b9e9d57@xs4all.nl> Chuck, the 10 and 50 watt levels can be adjusted by variable resistors but there must be some problem in the bias circuit of the finals where the power level is set by fixed resistors. A cold solder joint or a changed resistor value can be the cause of the changed bias. The 2SC5894 's can dissipate 250 watts of heat each so 200 Watts is no problem for them except ferrite transformers will run a bit hot. In SSB increased intermodulation products can appear but in CW there is no big problem. The TS850 has the same amplifier and running 180 Watts in CW was no problem. 73s Steve PA2A chuck via Kenwood schreef op 2018-08-05 00:59: > I have a TS-50 that I recently brought back on line and found that > everything worked...?.except the output power into a 50ohm dummy load > was a whopping 200 watts. I immediately stopped, went to SSB mode and > whistled up 200watts. A quick try in CW and AM produced the same > results. > > I had this rig repaired a few years back by Clif @ AVVID. He put it > in tip-top shape and I used it periodically afterward. Fast forward > to now (3+ years later) when I got it from the closet and found the > above described problem. It's been in a controlled environment and > not subjected to humidity or high temperatures. > > I'm guessing an electrolytic has given up and the bias on the finals > is in trouble. But that's only a guess. Anyone wish to comment? I'm > not equipped to service it unless there is something obvious that > doesn't require precision work. I'm one of the dinosaurs who is > linked to BA gear where I still do my own repairs, etc. > > Thanks for the read. > > 73 de W4MIL > Chuck > > > > > ????? ???? > > > > > ______________________________________________________________ > Kenwood mailing list > Home: http://mailman.qth.net/mailman/listinfo/kenwood > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Kenwood at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to pa2a at xs4all.nl From clif at avvid.com Sun Aug 5 09:32:41 2018 From: clif at avvid.com (Clif Holland) Date: Sun, 5 Aug 2018 08:32:41 -0500 Subject: [Kenwood] TS-50 problem In-Reply-To: <18c31e01ab316c5424e74bac3b9e9d57@xs4all.nl> References: <165072ae947-c89-14ad3@webjasstg-vaa48.srv.aolmail.net> <18c31e01ab316c5424e74bac3b9e9d57@xs4all.nl> Message-ID: <2b70b36b-bf66-09be-67cc-861c1eab9b1b@avvid.com> First, the bias circuit has nothing to do with power out. It determines the linearity of the final unit for SSB usage. The power out is controlled by the ALC circuit. There are several factors which can cause higher than normal power out. Most of which are traced back to leaking/open electrolytic caps. Leakage damages traces/thruholes. Open causes reference voltages to be incorrect, mainly the -6v supply. I'm not familiar with the 2SC5894's as the TS-50 and most Kenwoods of that era use the 2SC2879. Clif Holland KA5IPF www.avvid.com 214-850-0973 On 8/5/2018 2:27 AM, Steef PA2A wrote: > Chuck, > > the 10 and 50 watt levels can be adjusted by variable resistors but > there must be some problem in the bias circuit of the finals where the > power level is set by fixed resistors. A cold solder joint or a > changed resistor value can be the cause of the changed bias. > > The 2SC5894 's can dissipate 250 watts of heat each so 200 Watts is no > problem for them except ferrite transformers will run a bit hot. In > SSB increased intermodulation products can appear but in CW there is > no big problem. The TS850 has the same amplifier and running 180 Watts > in CW was no problem. > > 73s Steve PA2A > > chuck via Kenwood schreef op 2018-08-05 00:59: >> I have a TS-50 that I recently brought back on line and found that >> everything worked...?.except the output power into a 50ohm dummy load >> was a whopping 200 watts.? I immediately stopped, went to SSB mode and >> whistled up 200watts.? A quick try in CW and AM produced the same >> results. >> >> I had this rig repaired a few years back by Clif @ AVVID.? He put it >> in tip-top shape and I used it periodically afterward.? Fast forward >> to now (3+ years later) when I got it from the closet and found the >> above described problem.? It's been in a controlled environment and >> not subjected to humidity or high temperatures. >> >> I'm guessing an electrolytic has given up and the bias on the finals >> is in trouble.? But that's only a guess.? Anyone wish to comment?? I'm >> not equipped to service it unless there is something obvious that >> doesn't require precision work.? I'm one of the dinosaurs who is >> linked to BA gear where I still do my own repairs, etc. >> >> Thanks for the read. >> >> 73 de W4MIL >> Chuck >> >> >> >> >> ????? ???? >> >> >> >> >> ______________________________________________________________ >> Kenwood mailing list >> Home: http://mailman.qth.net/mailman/listinfo/kenwood >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Kenwood at mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to pa2a at xs4all.nl > ______________________________________________________________ > Kenwood mailing list > Home: http://mailman.qth.net/mailman/listinfo/kenwood > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Kenwood at mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to clif at avvid.com From cemilton at aol.com Sun Aug 5 15:09:09 2018 From: cemilton at aol.com (cemilton at aol.com) Date: Sun, 5 Aug 2018 15:09:09 -0400 Subject: [Kenwood] TS-50 problem In-Reply-To: <2b70b36b-bf66-09be-67cc-861c1eab9b1b@avvid.com> Message-ID: <1650b7e4418-c8c-17890@webjasstg-vaa32.srv.aolmail.net> Thanks for the replies to my TS-50 problem. I misspoke about bias being the issue, but my comment about a leaky cap or two matched with Clif's comments. He is the expert, for sure. I've seen caps in a TS-440 go South and the age of these rigs doesn't help much. I forgot to mention that the VR(15-16-14) controls had zero effect on the power output measurements. I'm going to check around IC-11 as well as the voltage rails and measure any electrolytics I see in the circuitry including the 6v rail. I won't spend much time on the rig and if nothing obvious pops up I'll offer it up. Thanks again, folks and Clif. 73 Chuck W4MIL ????? ???? -----Original Message----- From: Clif Holland To: kenwood Sent: Sun, Aug 5, 2018 9:33 am Subject: Re: [Kenwood] TS-50 problem First, the bias circuit has nothing to do with power out. It determines the linearity of the final unit for SSB usage.The power out is controlled by the ALC circuit. There are several factors which can cause higher than normal power out. Most of which are traced back to leaking/open electrolytic caps. Leakage damages traces/thruholes. Open causes reference voltages to be incorrect, mainly the -6v supply.I'm not familiar with the 2SC5894's as the TS-50 and most Kenwoods of that era use the 2SC2879.Clif Holland KA5IPFwww.avvid.com214-850-0973On 8/5/2018 2:27 AM, Steef PA2A wrote:> Chuck,>> the 10 and 50 watt levels can be adjusted by variable resistors but > there must be some problem in the bias circuit of the finals where the > power level is set by fixed resistors. A cold solder joint or a > changed resistor value can be the cause of the changed bias.>> The 2SC5894 's can dissipate 250 watts of heat each so 200 Watts is no > problem for them except ferrite transformers will run a bit hot. In > SSB increased intermodulation products can appear but in CW there is > no big problem. The TS850 has the same amplifier and running 180 Watts > in CW was no problem.>> 73s Steve PA2A>> chuck via Kenwood schreef op 2018-08-05 00:59:>> I have a TS-50 that I recently brought back on line and found that>> everything worked...?.except the output power into a 50ohm dummy load>> was a whopping 200 watts. I immediately stopped, went to SSB mode and>> whistled up 200watts. A quick try in CW and AM produced the same>> results.>>>> I had this rig repaired a few years back by Clif @ AVVID. He put it>> in tip-top shape and I used it periodically afterward. Fast forward>> to now (3+ years later) when I got it from the closet and found the>> above described problem. It's been in a controlled environment and>> not subjected to humidity or high temperatures.>>>> I'm guessing an electrolytic has given up and the bias on the finals>> is in trouble. But that's only a guess. Anyone wish to comment? I'm>> not equipped to service it unless there is something obvious that>> doesn't require precision work. I'm one of the dinosaurs who is>> linked to BA gear where I still do my own repairs, etc.>>>> Thanks for the read.>>>> 73 de W4MIL>> Chuck>>>>>>>>>> ????? ????>>>>>>>>>> ______________________________________________________________>> Kenwood mailing list>> Home: http://mailman.qth.net/mailman/listinfo/kenwood>> Help: http://mailman.qth.net/mmfaq.htm>> Post: mailto:Kenwood at mailman.qth.net>>>> This list hosted by: http://www.qsl.net>> Please help support this email list: http://www.qsl.net/donate.html>> Message delivered to pa2a at xs4all.nl> ______________________________________________________________> Kenwood mailing list> Home: http://mailman.qth.net/mailman/listinfo/kenwood> Help: http://mailman.qth.net/mmfaq.htm> Post: mailto:Kenwood at mailman.qth.net>> This list hosted by: http://www.qsl.net> Please help support this email list: http://www.qsl.net/donate.html> Message delivered to clif at avvid.com______________________________________________________________Kenwood mailing listHome: http://mailman.qth.net/mailman/listinfo/kenwoodHelp: http://mailman.qth.net/mmfaq.htmPost: mailto:Kenwood at mailman.qth.netThis list hosted by: http://www.qsl.netPlease help support this email list: http://www.qsl.net/donate.htmlMessage delivered to cemilton at aol.com From kenw8ek at gmail.com Sat Aug 18 17:29:48 2018 From: kenw8ek at gmail.com (Ken, W8EK) Date: Sat, 18 Aug 2018 17:29:48 -0400 Subject: [Kenwood] TS-940 FS Message-ID: <1486f462-e75b-99bc-7cfa-800866c45419@gmail.com> Kenwood TS-940 HF Transceiver For Sale: The TS-940 S/AT is an HF transceiver that covers 160 thru 10 meters, including the WARC bands. It has a built in 120 V AC power supply. More info about it can be obtained at https://www.universal-radio.com/catalog/hamhf/ts940s.html This particular rig will receive and transmit, but not the way that it should. I am sure it has had a "golden screwdriver" taken to it because 1) It puts out over 150 watts, with 175 watts on some bands, as read by an external wattmeter on a dummy load. 2) When switching between USB and LSB, the background white noise should sound the same if all is set correctly. It does not on this rig, indicating the passband has shifted. 3) Receive sensitivity MAY be low. When listening in the work room on a piece of wire, I could hear signals, but they seemed very weak. Of course the bands have been terrible, and the wire was not the best antenna. There may be other things that are out of alignment as well. I would recommend a complete A to Z alignment, and then I think all will be well. Cosmetically, I would rate if as an 8 or 8.5. The mode buttons show wear, as does the antenna tuner button. Others look nice. I have an original box for a TS-930, which should work fine for the 940. This rig is priced at $250 to let you take care of what is needed. It includes power cord, hand mic, and a CD with both operating and service manuals on it. Shipping is not included; actually I would prefer pick up near Ocala, FL. Thanks. 73, Ken, W8EK Ken Simpson E-mail to W8EK at FLHam.net or W8EK at arrl.net Voice Phone (352) 732-8400 From cemilton at aol.com Mon Aug 27 15:00:18 2018 From: cemilton at aol.com (cemilton at aol.com) Date: Mon, 27 Aug 2018 15:00:18 -0400 Subject: [Kenwood] TS-50 for sale Message-ID: <1657cc214cb-1eb8-1844@webjasstg-vaa07.srv.aolmail.net> Gents.... I have a TS-50 for sale. It works!!! HOWEVER, the output power is very high (~ 200w) which means the finals will not tolerate this condition for long! This rig was serviced by Clif at AVVID 3-4 years back and worked just fine. It has been sitting on my closet shelf in a humidity and temperature controlled environment and when I brought it out recently, everything worked but the transmit power is TOO HIGH. I'm not equipped to repair it! It's 99.9% likely that one of the electrolytic caps has either shorted or opened. Probably in the 6v rail. Eyesight and not proficient with SMD are the two limiting factors. I love this rig, but it's time for someone to repair it and put it back in service. If no takers, it will be recycled. Total cost is $100 which includes USPS Priority shipping (CONUS). USPS MO please! I also have the matching auto-tuner (working condition) available for $125 plus USPS priority shipping. OR, if you want both the TS-50 and the tuner I would ship them together in the same package to save some shipping costs. I've been up front and honest with the condition of the TS-50. No surprises! Therefore, no returns. Contact me off the reflector if interested. 73 de W4MIL Chuck ????? ???? From cemilton at aol.com Mon Aug 27 15:13:56 2018 From: cemilton at aol.com (cemilton at aol.com) Date: Mon, 27 Aug 2018 15:13:56 -0400 Subject: [Kenwood] TS 50 for sale. Message-ID: <1657cce8c40-1ebc-19af@webjasstg-vaa45.srv.aolmail.net> Gents...?? The TS-50 has been spoken for pending receipt of funds. Thanks all. 73 Chuck W4MIL ????? ????