Hello
does anyone have the circuit diagram for the MA-824 as fitted to the TRA-921 please? Also a clear layout would help as well please. The 921 handbook does not seem to have these diagrams in.
Thank you
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Hello,
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Has anyone ever found the service manual for the MA4204, a voice scrambler mad by Racal Datacom
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Many thanks,
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Martin
M0MGA
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Re: Audio amp for 6217A receiver
I haven¡¯t looked at the details but very frequently audio amps can be capacitor coupled at both input and output so you should be able to find a solution.?
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On Sep 22, 2024, at 2:49?AM, Mike Harmon via groups.io <mharmon@...> wrote:
? I would like to replace the 10 mW headphone amp in my 6217A receiver with an amp capable of driving a speaker (maybe something like an LM380). ?Problem is that the 6217A is designed to use positive ground, and the LM380¡¯s architecture is based on a negative ground circuit.
It can¡¯t be as simple as grounding pin 14 of the LM380 and supplying -18v to pin 7, or maybe it is that simple. ?I¡¯m not interested in the 1mV line - can I just leave it disconnected?
?
Has anyone done this before? ?I¡¯m trying to avoid using an external amp to drive a speaker.
?
Thanks!
Mike, WB0LDJ
mharmon at att dot net
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Audio amp for 6217A receiver
I would like to replace the 10 mW headphone amp in my 6217A receiver with an amp capable of driving a speaker (maybe something like an LM380). ?Problem is that the 6217A is designed to use positive ground, and the LM380¡¯s architecture is based on a negative ground circuit.
It can¡¯t be as simple as grounding pin 14 of the LM380 and supplying -18v to pin 7, or maybe it is that simple. ?I¡¯m not interested in the 1mV line - can I just leave it disconnected?
?
Has anyone done this before? ?I¡¯m trying to avoid using an external amp to drive a speaker.
?
Thanks!
Mike, WB0LDJ
mharmon at att dot net
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Re: 6790/GM firmware for the Z80 version A6A2 ?
If Phill is making it all is good and it should work, I am the only one that knows all the software because I have all the master after RACAL gave them to me and I controlled them when I worked there, they dumped the whole HF line at the same time and went to Scope Shield Radios.
Gary
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---------- Original Message ---------- From: "Dan Rae via groups.io" <danrae@...> To: [email protected]Subject: Re: [RacalRadio] 6790/GM firmware for the Z80 version A6A2 ? Date: Sat, 21 Sep 2024 15:25:18 -0700 On 9/21/2024 2:26 PM, gewingerd@... wrote: Dan,
The 1600305 is software for RA6793A Thanks Gary for that list.? 1600305 was being offered by Phill for the Z80 version A6A2 board in one of his earlier adverts. I'll stick with my F8 board since that has the 1/10/100 Hz tuning steps firmware which I find much more friendly and pleasant to use. Regards, Dan
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Re: 6790/GM firmware for the Z80 version A6A2 ?
On 9/21/2024 2:26 PM, gewingerd@... wrote: Dan,
The 1600305 is software for RA6793A Thanks Gary for that list.? 1600305 was being offered by Phill for the Z80 version A6A2 board in one of his earlier adverts. I'll stick with my F8 board since that has the 1/10/100 Hz tuning steps firmware which I find much more friendly and pleasant to use. Regards, Dan
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Re: 6790/GM firmware for the Z80 version A6A2 ?
Dan,
The 1600305 is software for RA6793A
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---------- Original Message ---------- From: "Dan Rae via groups.io" <danrae@...> To: [email protected]Subject: Re: [RacalRadio] 6790/GM firmware for the Z80 version A6A2 ? Date: Fri, 20 Sep 2024 07:46:27 -0700 On 9/19/2024 11:41 PM, gewingerd@... wrote: The 2 software's for the RS232 card were 1600207 and 1600304, I might
still have the files, I will check Gary, mine has 1600304, which has the original GM tuning rates and LF extension.? I was looking for 1600305 which apparently has different tuning rates.? I suspect that if anyone has Z80 programming knowledge the 304 version could be changed.? But not by me :^) Thanks, Dan
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Re: 6790/GM firmware for the Z80 version A6A2 ?
On 9/19/2024 11:41 PM, gewingerd@... wrote: The 2 software's for the RS232 card were 1600207 and 1600304, I might still have the files, I will check Gary, mine has 1600304, which has the original GM tuning rates and LF extension.? I was looking for 1600305 which apparently has different tuning rates.? I suspect that if anyone has Z80 programming knowledge the 304 version could be changed.? But not by me :^) Thanks, Dan
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Re: 6790/GM firmware for the Z80 version A6A2 ?
The 2 software's for the RS232 card were 1600207 and 1600304, I might still have the files, I will check
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Gary
---------- Original Message ---------- From: "vk2bea via groups.io" <vk2bea@...> To: [email protected]Subject: Re: [RacalRadio] 6790/GM firmware for the Z80 version A6A2 ? Date: Thu, 19 Sep 2024 16:32:52 -0700
On Thu, Sep 19, 2024 at 09:25 AM, Dan Rae wrote:
the later versions of the A6A2 card indeed used a Z80
I stand corrected! ?
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Re: 6790/GM firmware for the Z80 version A6A2 ?
On Thu, Sep 19, 2024 at 09:25 AM, Dan Rae wrote:
the later versions of the A6A2 card indeed used a Z80
I stand corrected! ?
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Re: 6790/GM firmware for the Z80 version A6A2 ?
On 9/19/2024 7:23 AM, vk2bea via groups.io wrote: Z80?? Isn't it a Fairchild F8 processor?
Michael Michael, the later versions of the A6A2 card indeed used a Z80 processor to replace the obsolete (by then) F8.? It completely imitated the original in function by order of the US military.? I have one in front of me. 73 - Dan
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Re: 6790/GM firmware for the Z80 version A6A2 ?
Z80?? Isn't it a Fairchild F8 processor?
Michael
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On Wednesday, September 18, 2024 at 12:11:18 PM EDT, Dan Rae via groups.io <danrae@...> wrote:
Does anyone have? .BIN file for the 1600305 that they can share? This
has the slightly better tuning rates than the 304 version I have.? I
have become so used to the 1/10/100 Hz tuning rates that going back to
the original military specified ones is painful.
73 - Dan
ac6ao / g3ncr
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6790/GM firmware for the Z80 version A6A2 ?
Does anyone have? .BIN file for the 1600305 that they can share? This has the slightly better tuning rates than the 304 version I have.? I have become so used to the 1/10/100 Hz tuning rates that going back to the original military specified ones is painful.
73 - Dan
ac6ao / g3ncr
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I have what I think is a 906 Squadcall. However, the circuit board layout is not the same, and the two power transistors attached to the side of the chassis are not there. There is not provision to fit these. Can anyone identify this radio please, or did Racal change the design part way into production.
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????????????????????????????????????????????????????????????????????????? Thank you
?????????????????????????????????????????????????????????????????????????????????? Andy
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Hello, does anyone have a manual or even just a circuit for the MA-926 please? I have one with wires taken off, and can find no info on the web.
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????????????????????????????????????????????????????????????????? Thank you
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Re: Racal manpack models list
I have 4720s A and B. Grand little radios?
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On 6 Sep 2024, at 15:51, Mike via groups.io <mail@...> wrote:
? On Thu, Jan 9, 2020 at 10:46 PM, Howard Small wrote:
There is also a 4720B2. I had a few of them that were made under licence in the Phillipines. They have an inbuilt speaker and microphone which is added by replacing the front panel.
Howard, Vk4BS
I designed the front panel for the PRM4720B. I've never seen it referred to as a B2 though.
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Mike G8GYW
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Re: Racal manpack models list
On Thu, Jan 9, 2020 at 10:46 PM, Howard Small wrote:
There is also a 4720B2. I had a few of them that were made under licence in the Phillipines. They have an inbuilt speaker and microphone which is added by replacing the front panel.
Howard, Vk4BS
I designed the front panel for the PRM4720B. I've never seen it referred to as a B2 though.
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Mike G8GYW
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Re: Racal manpack models list
Hi John
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Thank you for that. Any additions to the website are always welcome. I'll email you direct regarding the other brochures you mention.
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Regards
Dave g1jwg
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Re: Racal manpack models list
And excellent to see the PRM4051 on the home page. The first radio I worked on when I started at Mobilcal in 1979
Memories, memories
Steve
On Fri, 6 Sept 2024 at 22:05, John Whitehouse via <jgjwhitehouse= [email protected]> wrote:
Hi,
I hope you don't mind my unsolicited email but I have just had a look at your web site and noted you did not show a brochure for the Racal RA3711 HF receiver. I attach a scanned copy of the brochure for you if it is of any use? Not only do I have a copy of the brochure but I also have a RA3711 receiver. I also have somewhere copies of very old Racal Communications brochures dating back to the 1960's if they may be of interest?
Good web site by the way.
Best regards
John Whitehouse ?G6LJU
On Friday, 6 September 2024 at 09:19:44 BST, g1jwg < g1jwg@...> wrote:
Hi Terry
I don't know what Bob has done since 2004 and subsequently 2020 when the last post was made on this subject, but I've worked on it and my website at ? has a comprehensive list of Racal equipment.? I see you mention manuals, is there a specific one you're looking for.
?
Regards
Dave g1jwg
-- =====================
Decibel Engineering Pty Ltd
Westel Wireless Systems
4/21 - 25 Woods Parade
Fairlight? NSW 2094
Australia
m: +61 419 264 473
skype: steve_tucker
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Re: Racal manpack models list
Hi,
I hope you don't mind my unsolicited email but I have just had a look at your web site and noted you did not show a brochure for the Racal RA3711 HF receiver. I attach a scanned copy of the brochure for you if it is of any use? Not only do I have a copy of the brochure but I also have a RA3711 receiver. I also have somewhere copies of very old Racal Communications brochures dating back to the 1960's if they may be of interest?
Good web site by the way.
Best regards
John Whitehouse ?G6LJU
Hi Terry
I don't know what Bob has done since 2004 and subsequently 2020 when the last post was made on this subject, but I've worked on it and my website at https://www.radiohistory.uk/Racallist.htm? has a comprehensive list of Racal equipment.? I see you mention manuals, is there a specific one you're looking for.
?
Regards
Dave g1jwg
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Martin_Smyth
vk2bea
Robin Maddison
Mike
