[DCboatanchors] Schematic AM-12/APR1 (IF schematic for AN/APR-1)

[Tom Dawson]

Roy,

Thanks for the suggestions.

I had run across the GR radio mentioned while searching online for a 
schematic.  It was the GR P-540 and the March 1947 issue of the GR 
Experimenter features the P-540 and mentions other RADAR Intercept 
receivers.  The appearance of the P-540 is pretty close to that APR-1 
that I have, except the tuning units for the APR-1 have the motor drive.

Other versions based on the P-540 were the APR-4, made by Crossley, and 
Philco made the NAVY ARC-1 (not the usual one) and the SCR-587 for the 
Army.

This APR-1 was manufactured by Galvin, and it's pretty interesting in 
that the modularity of the construction is quite similar,  in some 
respects, to the way Motorola built the G-strip two-way radios later in 
the '50's.

Mike Hanz sent me a copy of the schematic, which, while not complicated, 
is still a helpful roadmap.

Now to track down that leaky cap in the grid bias/AGC bus...

73

Tom



On 8/19/2015 6:28 PM, Roy Morgan wrote:
> On Aug 19, 2015, at 6:17 PM, Tom Dawson<wb3akd at earthlink.net>  wrote:

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