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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.

Hello, Has anyone ever found the service manual for the MA4204, a voice scrambler mad by Racal Datacom Racal MA-4204 (cryptomuseum.com) ( https://www.cryptomuseum.com/crypto/racal/ma4204/index.htm )

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. Peter

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

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,

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

Dan, The 1600305 is software for RA6793A

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

The 2 software's for the RS232 card were 1600207 and 1600304, I might still have the files, I will check Gary

I stand corrected! ?

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

Z80?? Isn't it a Fairchild F8 processor? Michael

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

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

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. Thank you

I have 4720s A and B. Grand little radios? Robin G?GNE

I designed the front panel for the PRM4720B. I've never seen it referred to as a B2 though. -- Mike G8GYW

Hi John Thank you for that. Any additions to the website are always welcome. I'll email you direct regarding the other brochures you mention. Regards Dave g1jwg

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 [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 didnot show a brochure for the Racal RA3711 HF receiver. I attach a scanned copy of the