Re: wtb: repairable ac-3 or ac-4
Hi Mike!
Very good point!? Words to the wise, for sure.
Jim
KD0WF
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Re: A good Day at the Flea Market
Congrats on your great finds! DSP noise reduction plays well with the TR7. I have a JPS NIR-12 and a ClearSpeech base. They complement each other nicely. Some tasks are better with one or the other. These gadgets are designed to work with speaker levels. You may not have enough low level audio to get the best performance out of the DSP. However it is possible to achieve what you want to try without modding the rig. You have an audio out jack on the back that is basically audio at the top of the volume control. Assuming your MFJ has a high impedance audio input plug it in there. The MFJ has its own volume control and audio PA. Connect the output of the MFJ to a decent communications speaker and see how it works. Something else to think about, that RX antenna loop is a handy place to insert stuff like a preamp or a noise phaser. You will also want that path to be intact if you ever take the plunge and get an R7 receiver. 73 -Jim NU0C On Sun, 14 May 2023 14:49:49 -0700 "jerry-KF6VB" <jerry@...> wrote: Well, that DSP audio filter should play very nicely with my TR-7. Maybe
the noise reduction will help with that endless grinding noise I hear on
40.
The TR-7 has a couple of RCA jacks on the back. They connect the
receiver to the antenna. So you can disconnect them and use a separate
antenna with the receiver. I'm thinking of modifying that - I don't
have the luxury of separate antennas ( HOA ). I could stick those two
BNCs in the audio chain before the speaker amp. That way, the DSP could
work with low-level audio. Of course, I can just plug it into the
speaker output.
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A good Day at the Flea Market
Here in Silicon Valley, we have been ham-swap-less for a couple of years. First COVID killed it, then the venue ( Fry's Electronics ) went *poof*. Local clubs just managed to restart it last month.
There were some amazing deals. I scored a couple of MFJ items - a RT998 kilowatt remote autotuner for $100, and a 784B tunable DSP filter for a measly $40.
There was a guy with a very cosmetically nice Collins 30L-1 for $180. Yes, not a misprint. It had a cracked glass on the meter, and it needed one tube. But I already have a 30L-1 in the shed, so I passed.
What does that have to do with Drake?
Well, that DSP audio filter should play very nicely with my TR-7. Maybe the noise reduction will help with that endless grinding noise I hear on 40.
The TR-7 has a couple of RCA jacks on the back. They connect the receiver to the antenna. So you can disconnect them and use a separate
antenna with the receiver. I'm thinking of modifying that - I don't have the luxury of separate antennas ( HOA ). I could stick those two
BNCs in the audio chain before the speaker amp. That way, the DSP could work with low-level audio. Of course, I can just plug it into the speaker output.
- Jerry, KF6VB
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Re: wtb: repairable ac-3 or ac-4
Be sure you ship the speaker cabinet and P/S in separate boxes as stated in the manual. If you ship them as a unit the weight of the P/S will severely damage the speaker cabinet. A seller disregarded my instructions on shipping and my cabinet was destroyed.
Mike/ KE5YTV
On Sunday, May 14, 2023 at 01:40:20 PM CDT, Ronald Beaver <ronaldbeaver1320@...> wrote:
Here's the pictures.? Don't know how much shipping would be but I get an estimate.
Ron WB4OQL? Clyde, NC
Hi Ron and All,
Ron, I'd be interested in your ac-3 and speaker but, unfortunately,I won't be making the trip to the Hamvention. (My loss, I know!??) Would you be willing to ship? My zip is 65201. Pics would be great,or course!
73's to all who have chimed in!
Jim
KD0WF
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Re: FS-4B (with frequency counter)
I can send it to you, BUT.. It is totally un-supported. ?I am not sure I understand it at this point. It is a two part system, one in the rx, one in the tx, talking over a one wire bus. I posted the basics of the system a while back. Let me know if you really want the code. BTW, I really like the way it¡¯s working for me now. 73, Gary? WB6OGD?
toggle quoted message
Show quoted text
On May 14, 2023, at 11:50 AM, Gilles Delpech <gilles.f1bfu@...> wrote:
? Hi Gary
Where can I find the source code for the FS-5B version?
T3 Gilles
<73.gif>
Gilles F1BFU since 1969
GQRPClub 15889?
QRP ARCI 16979
??Chacun a raison de son propre point de vue, mais il n¡¯est pas impossible que tout le monde ai tort?? Gandhi
You want 16MHz..? Like I said in a previous post, it MAY be possible to change the Arduino
to 20MHz but you don't really want the hassle.
There are a lot of 20MHz TCXOs available but 16MHz is rare.
73,
Gary
WB6OGD
?
?
?
Gary
?
Yes some have a hole that allows access to fine tuning.
it can be supplied for the frequency of 16 mHz or it is necessary to upgrade the frequency of the Nano from 16 to 20 mHz.
?
<screenshot_9036.png>
?
73
<73.gif>
Gilles F1BFU since 1969
GQRPClub 15889?
QRP ARCI 16979
?
??Chacun a raison de son propre point de vue, mais il n¡¯est pas impossible que tout le monde ai tort??
Gandhi
Gilles,
The main reason is because I have a better solution for my project.? See photo, the small silver device in the lower left corner under the 25K trimpot.
There hasn't been much interest in the frequency counter is another reason.
BUT, the one you show might work.? The problem is it might be stable but it is not adjustable to exactly 16.0000000MHz so your count will still not
be correct.? BUT, see that little white dot on the main oscillator??? That MIGHT be a sticker and under it might be a trimmer!?? MIGHT.
There are some chinese vendors on ebay that sell just that part (which may be all that is needed) and one or two indicated they could make them 16MHz.
|
Re: FS-4B (with frequency counter)
Hi Gary
Where can I find the source code for the FS-5B version?
T3 Gilles
Gilles F1BFU since 1969
GQRPClub 15889?
QRP ARCI 16979
??Chacun a raison de son propre point de vue, mais il n¡¯est pas impossible que tout le monde ai tort?? Gandhi
toggle quoted message
Show quoted text
You want 16MHz..? Like I said in a previous post, it MAY be possible to change the Arduino
to 20MHz but you don't really want the hassle.
There are a lot of 20MHz TCXOs available but 16MHz is rare.
73,
Gary
WB6OGD
?
?
?
Gary
?
Yes some have a hole that allows access to fine tuning.
it can be supplied for the frequency of 16 mHz or it is necessary to upgrade the frequency of the Nano from 16 to 20 mHz.
?
<screenshot_9036.png>
?
73
<73.gif>
Gilles F1BFU since 1969
GQRPClub 15889?
QRP ARCI 16979
?
??Chacun a raison de son propre point de vue, mais il n¡¯est pas impossible que tout le monde ai tort??
Gandhi
Gilles,
The main reason is because I have a better solution for my project.? See photo, the small silver device in the lower left corner under the 25K trimpot.
There hasn't been much interest in the frequency counter is another reason.
BUT, the one you show might work.? The problem is it might be stable but it is not adjustable to exactly 16.0000000MHz so your count will still not
be correct.? BUT, see that little white dot on the main oscillator??? That MIGHT be a sticker and under it might be a trimmer!?? MIGHT.
There are some chinese vendors on ebay that sell just that part (which may be all that is needed) and one or two indicated they could make them 16MHz.
|
Re: wtb: repairable ac-3 or ac-4
Here's the pictures.? Don't know how much shipping would be but I get an estimate.
Ron WB4OQL? Clyde, NC
Hi Ron and All,
Ron, I'd be interested in your ac-3 and speaker but, unfortunately,I won't be making the trip to the Hamvention. (My loss, I know!??) Would you be willing to ship? My zip is 65201. Pics would be great,or course!
73's to all who have chimed in!
Jim
KD0WF
|
Re: FS-4B (with frequency counter)
You want 16MHz..? Like I said in a previous post, it MAY be possible to change the Arduino
to 20MHz but you don't really want the hassle.
There are a lot of 20MHz TCXOs available but 16MHz is rare.
73,
Gary
WB6OGD
?
On 05/14/2023 7:24 AM PDT F1BFU - Fr - 79 <gilles.f1bfu@...> wrote:
?
?
Gary
?
Yes some have a hole that allows access to fine tuning.
it can be supplied for the frequency of 16 mHz or it is necessary to upgrade the frequency of the Nano from 16 to 20 mHz.
?
?
73
Gilles F1BFU since 1969
GQRPClub 15889?
QRP ARCI 16979
?
??Chacun a raison de son propre point de vue, mais il n¡¯est pas impossible que tout le monde ai tort??
Gandhi
Gilles,
The main reason is because I have a better solution for my project.? See photo, the small silver device in the lower left corner under the 25K trimpot.
There hasn't been much interest in the frequency counter is another reason.
BUT, the one you show might work.? The problem is it might be stable but it is not adjustable to exactly 16.0000000MHz so your count will still not
be correct.? BUT, see that little white dot on the main oscillator??? That MIGHT be a sticker and under it might be a trimmer!?? MIGHT.
There are some chinese vendors on ebay that sell just that part (which may be all that is needed) and one or two indicated they could make them 16MHz.
|
Re: FS-4B (with frequency counter)
Gary
Yes some have a hole that allows access to fine tuning. it can be supplied for the frequency of 16 mHz or it is necessary to upgrade the frequency of the Nano from 16 to 20 mHz.
73
Gilles F1BFU since 1969
GQRPClub 15889?
QRP ARCI 16979
??Chacun a raison de son propre point de vue, mais il n¡¯est pas impossible que tout le monde ai tort?? Gandhi
toggle quoted message
Show quoted text
Gilles,
The main reason is because I have a better solution for my project.? See photo, the small silver device in the lower left corner under the 25K trimpot.
There hasn't been much interest in the frequency counter is another reason.
BUT, the one you show might work.? The problem is it might be stable but it is not adjustable to exactly 16.0000000MHz so your count will still not
be correct.? BUT, see that little white dot on the main oscillator??? That MIGHT be a sticker and under it might be a trimmer!?? MIGHT.
There are some chinese vendors on ebay that sell just that part (which may be all that is needed) and one or two indicated they could make them 16MHz.
|
Re: FS-4B (with frequency counter)
Gilles,
The main reason is because I have a better solution for my project.? See photo, the small silver device in the lower left corner under the 25K trimpot.
There hasn't been much interest in the frequency counter is another reason.
BUT, the one you show might work.? The problem is it might be stable but it is not adjustable to exactly 16.0000000MHz so your count will still not
be correct.? BUT, see that little white dot on the main oscillator??? That MIGHT be a sticker and under it might be a trimmer!?? MIGHT.
There are some chinese vendors on ebay that sell just that part (which may be all that is needed) and one or two indicated they could make them 16MHz.
73,
Gary
WB6OGD
|
Re: wtb: repairable ac-3 or ac-4
Hi Ron and All,
Ron, I'd be interested in your ac-3 and speaker but, unfortunately,I won't be making the trip to the Hamvention. (My loss, I know!??) Would you be willing to ship? My zip is 65201. Pics would be great,or course!
73's to all who have chimed in!
Jim
KD0WF
|
Re: FS-4B (with frequency counter)
Hi Garry
Why doesn't your solution use an external clock oscillator with a 16mHz OCXO like this
features are
Specification: Operating voltage: + 5V dc / +/- 5% Operating current: 20mA (MAX) Output waveform: TTL/CMOS Duty Cycle: 40/60% Frequency Stability Vs Temp: +/- 0.2ppm (-10~+60C) Size: 20.8x13.2x15mm Aging: +/- 0.1ppm/year. Input voltage: DC6V-10V
73 Gilles
 Gilles F1BFU since 1969GQRPClub 15889?QRP ARCI 16979
??Le vieux monde se meurt, le nouveau monde tarde ¨¤ appara?tre et dans ce clair-obscur surgissent les monstres¡??? Antonio Gramsci (1891-1937)
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Show quoted text
I started a new thread based on a comment by Gilles on Doug's talking FS-4A thread.
YES, the frequency counter in my FS-4B is less than desirable.? This is due to the ceramic resonator that is the time base on the cheap Arduino Nano boards.
The resonator has quite a warm up drift but after its temperature is fully warmed, it is "pretty" stable.? Since a counter needs a stable gate signal, this is a problem.
I found that you can provide an external clock signal to the Nano board rather simply.? See attached photo.
If you lift the two ATMega pins on the corner and solder a fine jumper to the second pin, you can supply an external 16MHz clock without an changes to the fuses
or Arduino code.? 0-3.3V or 0-5V squarewave is what you want to apply.? To get accurate frequency counting, it needs to be exactly 16.0000MHz and stable.
I was able to find a small $3.50USD clock chip at Mouser with temp compensation AND a voltage controlled freq trim pin.? Unfortunately they don't have these anymore
and I haven't been able to find them anywhere else.? You could make your own with a crystal and a trimmer cap... maybe use a logic gate oscillator or a transistor?
Maybe you can bring out two jumpers and get the ATMega into crystal oscillator mode by itself?
My workaround was a "calibrate" mode in the FS-5B code.. not ideal but after warmup it works pretty well.
I have also been looking for? a substitute for the Nano.? I thought I found it in the STM32 boards which have a crystal, are very advanced over the ATMega but?
unfortunately their software includes the FreeRTOS real time operating system with random interrupts to look for task switching.? The frequency counter works
great most of the time until the random interrupt corrupts... bummer.? Nobody seems to know how to shut down the RTOS... especially me.
NOTE: the Nano did have a similar problem with the millisecond counter interrupting but I did figure out how to stop that during freq counts.
If anyone knows a good cheap little computer board like the Nano but with a crystal and available freq counter code, let me know.
My FS-5 in both my R-4B (frankenstein!) and T-4XB have great stable counters using Nanos, so it is possible.
73,
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Re: FS-4B (with frequency counter)
Peter,
See the Files section for
$14 Homebrew FS-4B
That version has the frequency counter.? I tuses an ATMega internal Timer for the one second gate.
The code came from an Arduino library, I didn't write it.
I believe the 1PPS is not that accurate by itself but it corrects over time.? My GPS based frequency standard corrects over something like a minute and a half.
But, give it a try, maybe that could be a solution.
But too, for a digital dial, you want faster response than 1 second..? I use a 100ms gate for 10Hz resolution, that works well for me.
73,
Gary
WB6OGD
?
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If you have a proper size 24V fan then use it, but don't discount 12V models. They draw very little current and a 27-100 ohm 1/2w resistor in series with the positive lead will run it at whatever speed you want/ I often do this with 12V fans where full output is not needed. Just don't go too high or it won't start. I guess a rule of thumb is no less than half voltage. A 12V fan usually does not start running on 5V.
--
Doug, WA3DSP
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Re: wtb: repairable ac-3 or ac-4
Dave,
Forgot to mention I also have a MS4 for sale..I would be willing to make a package deal if your interested.
Thanks,
Bill N3WM
On Saturday, May 13, 2023 at 09:35:30 PM EDT, N3WM - Bill via groups.io <n3wm@...> wrote:
Hi Dave,
I have a spare AC4 that needs recapping that I will sell¡.it does not work.
Price is $125 + shipping from 23323 (Chesapeake, Va)
73¡¯²õ
On May 13, 2023, at 7:49 PM, Ronald Beaver <Ronaldbeaver1320@...> wrote:
? Hi Jim, I have a AC3 with speaker that you could use.? It has not been upgraded . I will take some pictures of it and send them to you. Are you planning on being at the Dayton hamvention?
Thanks, Ron WB4OQL Clyde, NC Hi to all!
I recently got a TR-3 functional and hope to use it on some of the vintage nets. I'm now looking for a repairable power supply to pair with it (with or without speaker.) If you happen to have one, please let me know.
73's and best wishes
Jim
KD0WF
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Re: FS-4B (with frequency counter)
Hi Gary,
Do you have some Arduino code somewhere showing how to use it as a counter?
I am also wondering if you would be better off connecting an accurate clock (such as the 1pps on a GPS module or from an OXCO) then using interupts to gate the frequency input. I have built an Arduino based WSPR generator designed by W3PM some years ago and it is accurate to less than 1 part in 10Million.
Cheers,
Peter - VK2AN
|
Good news Sean.? Thanks for letting me know.? I'd still open the RV-4C box and check out some of those larger resistors as well, if you have not yet done that.
Enjoy the TR-4Cw/RV-4C combo!
73 Peter VE7PS
On Sat, May 13, 2023 at 5:51?PM Sean (KK6BEB) < seanlynch@...> wrote: Peter, not only did the?De-oxit?fix the audio output issue, it brought back the VFO lamp! Thank you ! 73 Sean/KK6BEB On Sat, May 13, 2023 at 7:02?AM Sean (KK6BEB) via <seanlynch= [email protected]> wrote: Thanks so much Peter, really appreciate the thoughtful/thorough response here. Will absolutely follow your advice.
Sean KK6BEB? On Fri, May 12, 2023 at 10:55 PM VE7PS < ve7ps@...> wrote: Sean:
Suggest checking two things first....
1) There are some power resistors in the RV-4C that get quite hot and can change value.? Check all of those to make sure they are OK and within spec. I have had to change some of these in the RV-4 and RV-4C's.
2) Be VERY sure the connector in the bottom of the TR-4Cw and the cable end connector of the RV-4C are VERY clean.? Use De-oxit D5 if you have?it.
I have found these connectors to be more troublesome than they should be at times.
While you are at it with the contact cleaner, make sure the VFO selector switch in the RV-4C is clean too.
Nice radios....I have a TR-CW/rit hooked up to an RV-4C here.??
73 Peter VE7PS
On Fri, May 12, 2023 at 10:12?PM Sean (KK6BEB) < seanlynch@...> wrote: Hey gang, I recently acquired a TR-4Cw and RV-4C. Both work great however I noticed a big reduction in audio when I switch to using the RV-4C¡¯s VFO. I¡¯m guessing I have a bad/degraded tube in the RV-4C but not sure yet.?
I made a short video. Would appreciate your thoughts on this:
--
|
Re: wtb: repairable ac-3 or ac-4
Hi Dave,
I have a spare AC4 that needs recapping that I will sell¡.it does not work.
Price is $125 + shipping from 23323 (Chesapeake, Va)
73¡¯²õ
toggle quoted message
Show quoted text
On May 13, 2023, at 7:49 PM, Ronald Beaver <Ronaldbeaver1320@...> wrote:
? Hi Jim, I have a AC3 with speaker that you could use.? It has not been upgraded . I will take some pictures of it and send them to you. Are you planning on being at the Dayton hamvention?
Thanks, Ron WB4OQL Clyde, NC Hi to all!
I recently got a TR-3 functional and hope to use it on some of the vintage nets. I'm now looking for a repairable power supply to pair with it (with or without speaker.) If you happen to have one, please let me know.
73's and best wishes
Jim
KD0WF
|
Re: wtb: repairable ac-3 or ac-4
David,
I am interested in the AC3 & MS4 if they are still available.
What are you asking for the pair?
I will also be at Hamvention hosting at booth 1003 - 1004.
Dave KC3AM
On 5/12/2023 8:03 AM, David wrote:
As
I answered the previous?call for a TR3 assembly power supply:
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Thu,
May 11, 7:52?PM (11 hours ago)
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I have
an AC3 that I used with a TR3 many years ago.? I
still?have both and they are on the?list for
restoration.? From the looks of it, I
already?changed one of the?capacitors?and it
worked then, but I would suggest that a new kit be
installed.? I also have an MS4 speaker and cabinet
for it if you wish.? In the arrangement I had, I
used a RV3 remote VFO and speaker power supply
with it.? Was a lot of fun, then.
I am
going to the Dayton hamfest and can bring?it all
with me, if you plan to be there; otherwise the
shipping would be quite costly.
So,
what do you think?? If you can get one that is
plug in working, you may wish to go with that
instead of this.?
I am
sure that you know the AC4 will also work with the
TR3, but same issue; it likely needs an upgrade as
well.
David Assaf III
W5XU, VP8RXU
?
I could also use a AC-3 or AC-4 for my TR-3.
This is on my list to look for at Dayton.
Dave KC3AM
On 5/11/2023 6:52 PM, Jim Linsenbardt wrote:
Hi to all!
I recently got a TR-3 functional and hope to use it on
some of the vintage nets. I'm now looking for a repairable
power supply to pair with it (with or without speaker.) If
you happen to have one, please let me know.
73's and best wishes
Jim
KD0WF
|
Peter, not only did the?De-oxit?fix the audio output issue, it brought back the VFO lamp! Thank you ! 73 Sean/KK6BEB
On Sat, May 13, 2023 at 7:02?AM Sean (KK6BEB) via <seanlynch= [email protected]> wrote: Thanks so much Peter, really appreciate the thoughtful/thorough response here. Will absolutely follow your advice.
Sean KK6BEB? On Fri, May 12, 2023 at 10:55 PM VE7PS < ve7ps@...> wrote: Sean:
Suggest checking two things first....
1) There are some power resistors in the RV-4C that get quite hot and can change value.? Check all of those to make sure they are OK and within spec. I have had to change some of these in the RV-4 and RV-4C's.
2) Be VERY sure the connector in the bottom of the TR-4Cw and the cable end connector of the RV-4C are VERY clean.? Use De-oxit D5 if you have?it.
I have found these connectors to be more troublesome than they should be at times.
While you are at it with the contact cleaner, make sure the VFO selector switch in the RV-4C is clean too.
Nice radios....I have a TR-CW/rit hooked up to an RV-4C here.??
73 Peter VE7PS
On Fri, May 12, 2023 at 10:12?PM Sean (KK6BEB) < seanlynch@...> wrote: Hey gang, I recently acquired a TR-4Cw and RV-4C. Both work great however I noticed a big reduction in audio when I switch to using the RV-4C¡¯s VFO. I¡¯m guessing I have a bad/degraded tube in the RV-4C but not sure yet.?
I made a short video. Would appreciate your thoughts on this:
--
|
Jim Shorney
Gary WB6OGD
Doug Crompton WA3DSP
Peter E
