[Milsurplus] ARC-4

[Brenda Gentry]

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


On 7/20/25 2:11 PM, Jim Whartenby via Milsurplus wrote:
> 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 
> <farmer.rob.flory at gmail.com> 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.
>
> https://youtu.be/MYWgLHcVH0k?si=xjydC_IPf5AK9FmA
>
> RF
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