The WW2 and Korean era
VHF rigs, and the GRC-27,PRC-41,ARC-27,R-361,and
GRA-53/VRC-24 we used in the Air Force in
the early 70s were rated at 3 microvolts. The BC-639 could
sometimes do a little better, but getting a GRC-27 to do it
took hours of tweaking and hair pulling. All of them would
break squelch perfectly at 3.5 microvolts day in and day out.
I think pre-war VHF was mostly close to airports, so the 10
microvolts would have likely have been fine.
B. Gentry, KA2IVY
10uV input for 50mW audio output doesn't seem all that bad for a receiver with no RF amplification. Was this a civilian aviation VHF transceiver drafted into the military early in WW2? I seem to remember that the ARC-4 was in service before either the ARC-1 or ARC-3, but you know how memory can confuse things!Jim
Logic: Method used to arrive at the wrong conclusion, with confidence. Murphy
On Sunday, July 20, 2025 at 06:16:59 AM CDT, Rob Flory <[email protected]> wrote:
______________________________________________________________Hi,
I am an ARC-4/WE 233 person in recovery.
I pursued it because they were installed on USS Massachusetts, and because they work on the 2m Amateur band.
I used to take mine around to shows and talk between it and my ARC-1.
Read the description of the exercise K4CHE and I did, which revealed the relative deafness of the ARC-4.
RF
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