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I'm checking the performance of my newly acquired SM-220 and note that the levels of the two tone generator measured at TP1 and TP2 are 5.8V p-p which is nearly double the specified 3V. So I decided to adjust them but found this to be impossible because VR108 is inaccessible (under the CRT) and I can't see VR107 anywhere. My PCB doesn't match the drawing in the service manual. Any ideas please? -- Mike G8GYW

Now that I've fixed the problem with my ACC2 socket I've been reading about the supposed benefits of using it for audio in instead of the Mic socket. Apart from making the front panel tidier (no mic cable) is it worth doing? Is the speech quality improved without any external processing? -- Mike G8GYW

MONTHLY REMINDER--Our Amateur Radio Groups Below are our amateur radio related groups. Some may be new enough there are only a few members. If one of those interests you, join it and give it some time to grow. It costs nothing and if there’s few members, it won’t be filling up your inbox while you wait for it to grow. ? Alinco /g/Alinco-Amateur-Radio Antenna Tuners /g/Antenna-Tuners Anytone /g/Anytone-Amateur-Radio Baofeng /g/Baofeng CHIRP radio programming tool /g/CHIRP EF Johnson /g/EFJohnson-Amateur-Radio Ham radio antennas https://ham-antennas.groups.io/g/main Ham Radio Help group https://hamradiohelp.groups.io/g/main Icom /g/ICOM Icom 746 /g/Icom-746 Icom 746 Pro /g/Icom-746Pro Kenwood /g/Kenwood-Amateur-Radio MFJ ham equipment /g/MFJ-Amateur-Radio National /g/National-Amateur-Radio RF Amplifiers https://rf-amplifiers.groups.io/g/main Swan /g/Swan-Amateur-Radio Yaesu FT-757 /g/FT-757GX Yaesu FT-767GX /g/FT-767GX

? Well, I replaced the diodes and it didn't make any difference...Time to make some dinner...73...Jordan...

I have for sale a Kenwood TS2000 HF/VHF/UHF all mode radio, which does 100 watts on HF, 6, and 2m, and 50 watts on 70cm. It also will do full duplex for satellite operation. Has a AM/FM subreceiver and will do dual receive so you can listen to the local repeaters while operating HF or 6 meters. It also has a built in autotuner, 2 antenna jacks for HF/6m plus a receive antenna jack, built in CW memory keyer, TCXO, IF DSP for noise reduction and narrow filters, and most other features you would expect in an HF rig, plus you also get these features on 2m and 70cm! It comes with a Rigblaster soundcard interface, the CAT control cable with gender changer, and USB soundcard so you are ready to go on the digital modes from 160 to 70cm. It has been MARS modded so it will work on 60 meters also. It is in great operating condition. The bottom of the case has some white marks on it. The top, sides, and face look good. Has power cord and mic. Asking $825 shipped for all. Paypal/MO 73 John AF5CC

I have a Westmountain Radio Rigblaster Plus soundcard interface to do digital modes from your computer with your rig. Great for FT8/FT4, PSK31, and other soundcard modes. It comes with the the usual Rigblaster cables to interface with the radio and soundcard-and the DB-9 to DB-9 to use for PTT switching if you need it. Has two of the round mic to RJ45 cables to interface your radio with the rigblaster as well. I will also include a parts unit Rigblaster which doesn't power on, and some of the cables that come with it. - This package will need a power cord or wall-wort as I don't have one for the Rigblaster plus. It is currently wired for Kenwood radios but you can wire it for any model radio just by changing some of the jumpers in the rigblaster. I will include an extra RJ45 cable so you can interface the rigblaster between it and a radio using a RJ45 mic connector, and then use a 8 pin round mic thru the rigblaster, if you like. - It also comes with a homebrew audio switching box which probably contains some good parts in it for projects as well. - I am asking $33 shipped in the US and can take paypal/check/MO. - 73 John AF5CC

? Ooops...it should read "...which formed part of the BCB attenuator..." 73...Jordan...

? Hi group.. I have a 450S which has served me very well for ~30 years now. Long ago, I jumpered the resistors which formed part of the BCB, effectively removing the attenuator. It was fine for years like that, but a few months back I noticed a drop in BCB sensitivity. All other bands are fine... I checked everything I could, replaced the jumpers and verified the ckt, to no avail. I checked the control line for that band at the 74LS245 and found what I thought was the problem, so this morning I replaced that IC. It didn't solve the problem. The only other thing I can think of is that one of the 2 RLS135 diodes for that band might be flaky so I checked them as diodes and they test fine. Is it possible that these diodes might operate fine for DC but not for RF...? I think I'll replace those two diodes and check again, but this has me a little stumped... 73...Jordan VE6ZT

Now here is a rare find. I have for sale a Kenwood 500hz CW filter, listed as the YF-3395C-1 but it looks identical to the more common YG3395C. This fits the 520, 599, 511, 510, and other radios with a 3.395mhz IF. It is brand new! I opened up the box and it still have the foam padding around it which has pretty much disintegrated. Has the original box and instruction sheet with it I am asking $50 shipped in the US and can take paypal/check/MO. 73 John AF5CC

I'm experimenting with this technology. I am attempting to assess if anyone would be interested in my experience constructing an Arduino-based DSP Noise Reduction implementation by Graham Whaley. One can read about his wonderful DSPHam device here: https://github.com/grahamwhaley/DSPham/blob/master/README.md It's quite feature packed and provides the user with: Several digital filters with differing bandwidth for FM, AM, SSB, CW which can be customized Two different AGC algorithms Noise Blanker and Notch Filter Selectable Noise Reduction Algorithms: Least Mean Squared (LMS), Spectral Subtraction, Two types of Moving Average, and Leaky LMS Three algorithms for decoding CW Approximate parts summary and cost: $36 Teensy 4.1 ARM Cortex-M7 Processor $15 Teensy 4.0/4.1 Audio Adpater Shield $ 4 Two-Line x 16 character backlit LCD (I originally used an RGB LCD, but then modified the code to use a cheaper mono-chromatic LCD) $ 2 Rotary Encoder Some additional miscellaneous parts, for 5V power-supply, wire, filter, mono-audio plugs, etc. Note: I have not put it in an enclosure yet. But one can see from the list above, adding DSP capability to an older radio can be done for a very reasonable amount. Please let me know if you are interested. 73 W7STF Sam

my tm-g707 has taken to starting up in the VFO mode rather than Memory mode. I have been thru the manual and searched online but no info found any ideas on how to get it back to starting up in the memory mode. Many thanks John K4IIY

Maybe out of context of this group but I'm looking for some intelligent answers. Anyone know of a "good" whip for HT use? Dual band would be nice, but better yet a triband better. I' tried a few models from Diamond, Comet and some "white box" ones from China. However the return loss is poor to unusable in the area of 8 ~ 0 db respectively. I have more results on the web site, but don't wanna bore the readers. -- - Regards, Karl Shoemaker To contact me, please visit SRG's web site at http://www.srgclub.org for the current email address.

Picked up a used TS570SG recently. It is a nice radio overall. However, the SWR circuit doesn't seem to be working correctly. It never shows higher than a 1.5 SWR, even with no load connected. And it doesn't agree with an external meter I have. Consequently the SWR/Power foldback circuit never really gets activated. I tried a full reset on it and it still does the same thing. Ideas? Anyone seen this before? 73 John AF5CC

I have for sale 2 items for the Kenwood TS480/590 ( and a few other radios). 1. 4 pin power cord used in most modern HF radios. 6 feet long, spade type fuses in both lines. Each line consists of 2 cables, for a total of 4 cables. Handled 100 watt radios with no problem. 2. Several Kenwood radios use a male DB-9 connector for computer control. Many of the USB to serial cables you buy off of ebay or Amazon have a male DB-9 on the one end. So here is your solution! I have a DB-9 female to female gender changer plug. Insert one end into the male connector on your rig, and now you have a female DB-9 connector to plug your cable into. Great for CAT control of your radio. This one is 2 to 3 inches long, made out of hard plastic, and built like a tank. It should hold up very well. I am asking $22 shipped for both. I can take paypal/check/MO/cash/cashapp. 73 John AF5CC

Kenwood TS-440 S/AT HF transceiver, SP-940 speaker, YK-88 C CW Filter, MC-48 DTMF Microphone, D-104 Desk Mic, manuals and more For Sale: . Kenwood TS-440S/AT HF Transceiver: The Kenwood TS-440 was designed for superior performance in the the SSB, CW, AM, FM and AFSK modes. Coverage is 160 through 10 meters including the WARC bands with 100 watts final amplifier stage (40W AM). This one is the "AT" model, which means it has the AT-440 antenna tuner built-in. It requires 13.8 VDC at 20.5 Amps. Features: 160-10 meters IF Notch CW Reverse 100 Memories Dual Mode NB XIT/RIT SSB/CW Slope Tuning Memory Keyer Keypad Entry RF Speech Processor This one looks fine and works 100% as it should. Great receive. No "dot problem". It is in its original box. Buy it for $325 . Kenwood SP-940 DeLuxe Speaker: The Kenwood SP-940 is a deluxe external speaker designed to match the TS-940S. The SP-940 uses a panel made of reinforced ABS plastic and an expanded metal speaker grill to improve tone quality. It features a 4 inch, 8 ohm, 1.5 watt speaker with a frequency response of 100 to 5000 Hz. Filtration is built in with three cutoff frequencies: LOW at 430 Hz, HIGH1 at 1000 Hz, HIGH2 at 2500 Hz and HIGH1+2 at 730 Hz. This speaker features dual inputs and has a post-filtration 1/4 headphone jack. 7.01 x 5.51 x 11.4 inches This one sounds great, and of course you can tailor it to make it sound the way you want. Cosmetically, it looks really great. Buy it with paper work for $95 . Kenwood YK-88 C Crystal Filter: It works as it should and is solder in type. It looks fine also, as if that matters for a filter inside the rig. This filter is used in rigs such as the TS-120, TS-130, TS-430, TS-440, TS-520, TS-530, TS-820, TS-830, and others. Kenwood YK-88 C, 500 Hz CW Filter This is the medium width CW. $75 . Kenwood MC-48 DTMF Hand Mic: The MC-48 is an electret hand microphone with a 16 digit touch tone pad on the back, and up/down switches on the top. Of course it has a PTT switch on the side. It has a round 8 pin connector. The MC-48 can be used on virtually any Kenwood rig with the round 8 pin connector. Even if your rig did not have a DTMF mic on it originally, you can add it by using the MC-48. This one works as it should. All 16 TT buttons work fine. Cosmetically, it looks very close to new. Buy it with paper work for $50 . Astatic D-104 Desk Microphone: The D-104 is a very common desk microphone for ham use. Sometimes it is referred to as the "lollipop microphone". It features extremely good audio properties. This particular D-104 has the UG-8 "grip to talk" stand with it. This one works fine, just as it should. It has a 4 pin connector on it, wired for Kenwood. Buy it with paper work for $95 . Kenwood Charger for TH-225 HT; $10 . I have parts for a Kenwood TS-440 available. Hopefully we can keep a couple units working and looking nice using these parts. The rear part of the bottom cover is presently available. It looks very nice, and might improve the looks of your rig. The small little silver rectangular buttons are still available. Most small PC boards, such as selectivity switch, mic jack, front panel push buttons, etc. are available. Some knobs are available. The automatic antenna tuner, final module, PTO, and large PC boards are no longer available. Please let me know what you need. . Original Manuals for Kenwood equipment: All manuals are in nice condition and are original operating manuals unless otherwise specified. R-300 Receiver $10 R-2000 Receiver $22 R-2000 Service Manual $18 R-600 Receiver $10 TH-21 2 m HT $8 TH-22/42 HT, cover stained $6 TH-215/315/415 HT for 2 m, 220 MHz, 440 MHz $10 TH-225 2 m HT $12 TH-F6A TriBand / TH-F7E Dual bander HT $20 TH-K2AT, KT-4AT $10 TL922A HF Amp W7FG reprint in binder $20 TM-221/421 2 m/440 MHz mobile $12 TM-241/441/541 mobile FM $12 TM-261/461 2m/440 MHz mobile $12 TM-621/721 Dual Bander $12 TM-732 Dual Bander $12 TR-2400 2 m HT $12 TR-2500 2 m HT $12 TR-2600 service manual $12 TS-50 HF Transceiver $20 TS-430 HF Transceiver $15 TS-450 "External Control" $7 TS-590S HF Ttransceiver $25 TS-590SG HF T

Hello group, Nice forum here, for sure. I have a strange issue with one of my TS-570S transceivers that exhibited low sensitivity when first turned on with SSB LSB/USB and AM. CW reception and transmission is not effected. The SSB and AM is almost perceptible, and once it warms up, it would work fairly well again. Now it's become a permanent problem, with only CW functioning properly. I am thinking a mixer issue, and most likely a leaky capacitor. Just wondering if there is someone on the group here who's had this problem and how to track it down. Thanks! Dave NS8S

I'd like to use a foot switch to control PTT on this rig. What's the best connector to use on the rear panel? Can I use the KEY jack if I'm operating SSB? -- Mike G8GYW