Russ, thus far, pretty good. So I have a TS-570DG and TS-890S that I am trying it with. (yes, I know, both have MPUs for doing signal processing and NR).
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I find the NR, NB and Morse decode functions in the TS-890S to be very good. My ultimate desire though is to use this circuit with a Realistic DX-302 SW receiver (remember those of the 1970s?). I purchased one last year, which has none of the processing capabilities of the 570 and 890. That was one motivator for building Graham's project.
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Also, my desire was simply to get exposed to the practical application of this area of study.. Over 35yrs ago, I was pursuing a post-grad degree at GA Tech, and at the time, taking classes from professors well known and published in the field of Digital Signal Processing. Unfortunately, most of the concepts and theory I learned then exists amongst mental cobwebs at this point. It's often said, what you don't use, you lose.?
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Tom - this is DSP in the aft-end of the audio chain. Graham's project does not perform signal processing in the IF-stage, but I think you'll find this a worthwhile project.
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It's not too dissimilar to the DSP modules made by BHI (the NEDSP boards). Years ago, I put one of those into a TS-440SAT with pretty dramatic results. I have a write up for it on the Kenwood TS-440S Groups.Io forum in the Files section and another person posted a YouTube video on it.
Interestingly, while the results were very good with the BHI module, there were many artifacts (like sounding under-water) in that implementation when going to the highest setting of NR, that I do not hear with the Teensy. The Teensy implementation is also much less expensive!?
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FWIW: In the files section of the TS-570 Group.Io, I placed a write-up for installing an IF tap for SDR Waterfall Display in my TS-570DG. I like to experiment, and Kenwood makes great products. So blending new and older technology is a great aspect of our hobby.
I'm assembling a few photos now and will post them here in the file section tomorrow (Saturday) which covers initial prototyping of the circuit and specifics to assembly which may be of help others. I think I'll post my notes as well. Then I'll go the next step to revise those notes, and provide information regarding the software and installing the necessary elements on a PC.
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Graham's README.md file covers a lot that should be read first, but I did need his help so I think I can distill some of it to help people get over the "activation energy" needed to purchase the parts and give it a go if interested.
73 W7STF S.
?
?
?
Re: Any Interest in adding Digital Signal Processing Noise Reduction to an older Kenwood Transceiver?
I have 3 radios that could benefit from such a thing: a 520, an 830, and an FT 101b. I have only basic experience with an arduino. ?A project like this would certainly be of interest!
73,
Tom ai4th
Re: Any Interest in adding Digital Signal Processing Noise Reduction to an older Kenwood Transceiver?
The hardest aspect of the project for me was my lack of recent experience with the Arduino development environment. I received some handholding from Graham.
However, now I could support others, like he supported me if they wanted to build the software that is to be uploaded to the Teensy.
Another aspect of the learning curve for me was examining the source, and documenting how to use the menu system of the project.
So, I've been putting some additional documentation together and sharing with Graham that may get merged with Graham's documentation, or stand on it's own and be provided as supplemental notes.
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It is possible (I can ask Graham about this) to provide the resultant file of the build process so others wouldn't necessarily have to worry about installing the Arduino IDE and libraries.
Of course then, you'd rob yourself of the ability to modify the source code.
But I think I can provide step-by-step instructions for installing the necessary libraries and downloading the source, and getting the system setup so one can do builds and perhaps their own modifications.
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The wiring is much simpler IMHO than building many other kits. Everything is rather modularized in Arduino, and the connections to the LCD, and Rotary Encoder from the Teensy and it's Audio Board is pretty simple.
While it's most easy to use a solderless breadboard and Dupont Jumpers to initially get things working, you wouldn't need a breadboard, you can do point-to-point wiring using a soldering iron without much effort.
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In a day or two, I will upload a few pictures of the breadboard implementation I have.
Sam
Re: Any Interest in adding Digital Signal Processing Noise Reduction to an older Kenwood Transceiver?
On Thu, Feb 27, 2025 at 11:57?AM Samuel W7STF via <sernstfortin=[email protected]> wrote:
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:
?
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
?
Any Interest in adding Digital Signal Processing Noise Reduction to an older Kenwood Transceiver?
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:
?
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.
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.
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?
for the current email address.
On 2/20/2025 2:19 PM, Jim Barbour via groups.io wrote:
Why not stick with what came with the radio? Every Kenwood I've had worked great with the original antenna. I still use the original on the G71 I have. The F6 I had to replace because I caught it in a door...I did change that one out for the Vertex quadband antenna which gave me some 6M rx capability-plus it was much cheaper. But that's been working great too. I don't think much of the ham grade aftermarket antennas, especially the big long ones. They catch on things, break easy, and don't work enough better to justify spending the money on them.
On 2/20/2025 2:31 PM, Lou WA5LOU via groups.io wrote:
Have you tried any of the antenna groups?
Lou WA5LOU
On Thu, Feb 20, 2025 at 2:26?PM K7SRG via groups.io <> <srg734@... <mailto:[email protected]>> wrote:
??? 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 ??? <> ??? for the current email address.
Why not stick with what came with the radio? Every Kenwood I've had worked great with the original antenna. I still use the original on the G71 I have. The F6 I had to replace because I caught it in a door...I did change that one out for the Vertex quadband antenna which gave me some 6M rx capability-plus it was much cheaper. But that's been working great too. I don't think much of the ham grade aftermarket antennas, especially the big long ones. They catch on things, break easy, and don't work enough better to justify spending the money on them.
On 2/20/2025 2:31 PM, Lou WA5LOU via groups.io wrote:
Have you tried any of the antenna groups? Lou WA5LOU On Thu, Feb 20, 2025 at 2:26?PM K7SRG via groups.io <> <srg734@... <mailto:[email protected]>> wrote: 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 <> for the current email address.
On Thu, Feb 20, 2025 at 2:26?PM K7SRG via <srg734=[email protected]> wrote:
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? for the current email address.
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? for the current email address.
I have for sale 2 items for the Kenwood TS480/590? ( and a few other radios).
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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.?
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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.
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:
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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.
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
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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
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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
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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 Transceiver $25 TS-830 W7FG reprint in binder $20 TW-4000 dual band mobile $15 TW-4100 dual band mobile $15
BC-2 Wall Charger $2 BC-5 DC to DC quick charger $2 DC-21 Dc-DC Converter $2 IF-232C Interface $8 LF-30A Low Pass Filter $4 MC-30 & MC-35 hand microphones $4 MC-50 Desk Microphone $4 MS-1 mobile stand $3 PB-1, PB-2, PB-3, & PB-4 battery packs $2 PB-21 Battery Pack $2 PB-24 battery pack for TR-2400 $2 PB-25 H battery pack for TR-2500 $2 PS-6 power supply $5 SC-8 / 8T Soft Case $2 SMC-24 speaker mic $2 SMC-25 speaker mic $2 SP-820 Speaker $2
SPECIAL: Buy two, three, or four books/manuals, and take 10% off. Buy five or more and take 20% off.
These are original Kenwood manuals only.
Kenwood Operating Manuals in "Non English" Languages For Sale:
All of the following manuals are not in the English language. They are the original Kenwood operating manual only. They look quite extensive and detailed, and are basically new, only being opened to observe that it is something I can not read. They are all original manuals from Kenwood.
Kenwood TH-22 A Two Meter HT Spanish Version for the TH-22 A / 22 AT / 22E and TH-42 A / 42 AT / 42 E $8
Kenwood TH-22 A Two Meter HT French Version for the TH-22 A / 22 AT / 22E and TH-42 A / 42 AT / 42 E $8
Kenwood TM G-707 dual band transceiver Spanish version of the TM G-707 Operating Manual $8
Kenwood TS-590 S HF transceiver French version $ 12 Spanish Version $12
Kenwood TS-590 SG HF transceiver French version $12
These are manuals only.
.
I also have many other accessories available such as many different types of microphones, HTs, VHF and UHF rigs, HF and VHF/UHF antennas, connectors, miscellaneous accessories, etc. Just too many to list here. Please e-mail your requests.
. Prices do not include shipping from Florida.
Thanks.
73,
Ken, W8EK
Ken Simpson E-mail to W8EK@... or W8EK@... Voice Phone (352) 732-8400
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
Tom ai4th
Frank Swindler Jr.
K7SRG
Charlie Fellenbaum - WB4FAW
Lou WA5LOU
David