[Milsurplus] National R-1230 countermeasures receiver

[Peter Gottlieb]

You should be able to figure out several pretty easily.  Start with ground, then 
use an ohmmeter to track back from a 6 volt tube to the 6.3 VAC pins, same for a 
5 volt tube.  Find a plate of some output tube and that should lead you to B+ 
input (175 VDC?  or is there a separate supply run by 115 VAC inside?).  Either 
way you will know, and presumably there is some 115 VAC transformer in there 
from which you can ohm out those input pins.  That kind of technique should get 
you pretty far.


On 12/1/2011 6:44 PM, HL wrote:
> Nick (K4NYW) found a typo in my appeal.  It should be AN/FLR-11, not AN/FRA-11. Sorry--another senior moment! My message is corrected as follows:
>
> Wanted: manual, schematics for National Radio Company’s 1963 countermeasures receiver, Models R-1230 (aka: R-1125 or AN/FLR-11 or AN/FRA-54). (Manual ID: NAVSHIPS 94581) I think I can deal with its 65kHz IF output, and I can provide the needed power voltages, but am stymied without a schematic by the power connector with its ten unidentified pins (A through J) for 175VDC, 6.3VAC, 18VAC, 5VAC, 115VAC, etc. Would love to get this wonderfully built, complex beast operating! Any info will be appreciated. Holiday greetings, Hal KK6HY
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