[Premium-Rx] SRT CR302A EJ KANB 301A

[Karl-Arne Markström]

Hello,

The CR301 will give audio output from the Channel A or USB channel 
when set to ISB mode.
However, if the Channel B button is pressed, there will be no sound, 
as the LSB IF channel is unpopulated
(there is actually an empty box in the IF section of the receiver).

Unpopulated slots can have several reasons.

One is the lacking ISB audio amplifier, one is the optional FSK 
demodulator or remote control switching cards.
It seems that the improvised decade counter board uses one of the 
spare remote control card slots.

Regarding a manual, it presents a problem to scan or copy them, as 
they are a binder 6 cm thick.
I would look out for a spare English language manual if I manage to 
find one somewhere.

Here is a link to the Swedish language military manual 

http://www.sm7ucz.se/Ra844/Ra722.pdf

I have worked professionally with these receivers (and their 
successors CR90 and CR91)
in civilian and military systems since the early 80's, and still 
maintain a handful of CR302's
for a customer.

73/
Karl-Arne
SM0AOM

73/
Karl-Arne
SM0AOM


----Ursprungligt meddelande----
Från: zpz at gmx.de
Datum: 2013-06-24 20:55
Till: "premium-rx"<premium-rx at mailman.qth.net>
Ärende: [Premium-Rx] SRT CR302A EJ KANB 301A

Many thanks to Karl-Arne and Chuck for the detailed information, 
impressing expertise!

In the front right corner of the unit there are 4 originally 
unpopulated slots (one of these helds the DIY pcb).
I guess these are for the ISB option(?). What I do not understand, 
that the unit is still working (giving some sound)
when switched to ISB or even to the further not marked positions. The 
rest of the unit is really full. Most modules
have their own enclosure and carry a ITT label.
It would be very interesting to get some schematic or manual of some 
SRT 300 series 
receiver - but I guess this could be a *difficult* task. 

This evening is reserved for further investigation and measuring the 
IF out.

best regards
Peter



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