[Premium-Rx] RA-17xx variants

[Al Klase]

Hello Clemens,

I've had a 6772E for a number of years, and have been using it more 
lately.  Seems to be quite a good receiver.

Again from radiomuseum.org:

Commercial / military grade communications receiver covering 1000 - 
30000 kHz, AM, USB/LSB, CW, FM;
standard IF bandwidths 0.3 / 1 / 3.2 / 8 / 16 kHz, BFO control with 
separate LED readout, optional remote controllable with MA-6003 Remote unit.
Tempest qualified highly shielded variant of RA-6772, similar to RA-6778.

  Mine has the ISB option.

The major down side is that it forgets the frequency when you turn it 
off.  The only audio output on the rear panel is 600-ohm line-lever, but 
the headphone jack will drive a lo-Z speaker reasonably well.

There's no LCD's and no microprocessor.  The whole control circuit is 
implemented in TTL logic.  That's just fine by me, as I was able to work 
out a simple mod to tune below 1 MHz.  See: 
http://www.skywaves.ar88.net/commrx/RACAL/Racal.html

Regards,
Al

On 8/17/2010 12:50 PM, Clemens wrote:
>
> Michael asked about other types in the series. With so many elephants
> around, I hesitate a little,:-) but feel safe commenting on the -73
> and 74. They must have been aimed either at marine use or for some
> kind of mobile use(!), the radiomuseum site describes them thus:
>
> RA-1773 (RA1773): RA-1771 fitted with MA-1070A connector panel
> providing a fan and front connectors of rear sockets, all in Creeth
> Field Transit Case.
> Similar receivers:
> RA-1774 (RA1774): RA-1772 fitted with MA-1070A connector panel
> providing a fan and front connectors of rear sockets, all in Creeth
> Field Transit Case.
>
> I have been wondering when someone would bring up the
> American-produced types, like 6772, 6772E(R-2130), 6778A,B,C and Q
> (remote), the latter ones Tempest qualified, and the 6778A,etc having
> push-buttons and more memories. Does anyone have the story on
> those?  And on the Canadian RA8772CB?
>
> I could add to common failures, the LED's giving up, but fortunately
> they are 'standard issue', like HP used for instance, so easy to find.
>
> Best,
>
> Clemens S.Ostergaard
> DENMARK
>
>
>
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-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/