[Exotics] RA6709GM-23

Tue, 06 May 2003 21:56:44 -0400

Hi,

  It sounds like you have the later version of the 6790/GM.  Try contacting Gary Wingerd about info.  Contact 
info for Gary should be on this list.

Regards,
Geoff Greer

5/6/03 16:16:48, [email protected] wrote:

>I recently received a RACAL RA6790GM-23. There is some control function 
>but not complete response. I'm using the test procedures from the R-2174 
>(P )/ URR manual so I don't know if it is all the same. I haven't been 
>able to find any documentation on this receiver as yet.
>
>Here is what I have so far........
>
>--A1 LPF    08385  - same as the R-2174
>
>--A2 1st Mixer    09635 REV C   -  080386 in the R-2174
>
>--A3 2nd Mixer    08191 REV B  -  same as the R-2174
>
>--A4 IF                                        -  totally different from the 
>R-2174
>        A4A1 IF Filters       4100506-501 REV E
>        A4A2 IF                     4100505-501 REV B
>        A4A3 IF DET          4100568-501
>
> The A4 PCB is broken down into 3 separate PBCA's. 
> A4A1 has the three XTAL Filters with 350 Hz, 750HZ, and 1.4KHz BP. 
> A4A2 looks like switching and amps.
> A4A3 is in a shielded container and looks like the detector. 
> All three PCBA's fit into the same area as a regular A4 PCB.
>
>--A5 ISB                                       -  totally different from the 
>R-2174
>        A5A1 Looks like a data interface           4100369-501 REV A
>                A5A2 ???     4100215-501 REV A
>
>  In the area where the ISB A5 PCB would go is two PCB's ID'ed as A5A1 and 
>A5A2. 
>  These are some sort of data interface.
>
>--A6        totally different from the R-2174
> 
> A6A1 ACSII Interface  -  not installed
> A6A2 Microprocessor (Z80)      4100030  - not same
>
> A6A2 Microprocessor is a Z80 in this RCVR and the A6A1 ACSII interface 
>isn't installed.
>
>--A7 1st LO/SYNTH 09134  -  08387 in the R-2174
>
>--A8 2nd LO/BFO  096?? (numbers obscured/unreadable)
>
>--A9 didn't check yet
>
>--A10 didn't check yet but looks like a normal R-2174 P/S
>
>There is line audio/no phone audio. No detected signal at the audio. No 
>signal indication on LCD.
>
>Tonight I will check and compare the signal routes against the R-2174 
>manual and see if I can get some signal thru the receiver.
>
>Any help out there???????
>
>RICH  WA6KNW
>
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