[ARC5] 200MC receiver?

[Mike Morrow]

Bob wrote:

> Does anyone know about a 200MC receiver that was made is a case that
> fit a ARC-5/SCR-274 receiver rack?

Michael wrote:

>That would be the R-4/ARR-2 which replaced the ZB for the Navy's
>shipboard navigation system.
>
>It was an interesting receiver since it downconverted to somewhere
>around 540 KCs into what amounted to a TRF receiver.

It replaced the USN homing system of R-1/ARR-1 VHF adapter feeding
R-24/ARC-5 broadcast band receiver (or ZB/ARA equivalent).  I haven't
seen any documentation of USAAF utilization of the AN/ARR-2 in place
of their few R-1/ARR-1 with BC-946-B homing systems.  The R-4 would
have worked in a SCR-274-N rack.  For that matter I've not seen
evidence of R-4/ARR-2 use in ARA racks, but it could be made to work
there.

The R-4/ARR-2 is an 11-tube unit, with a 234 to 258 MHz four-tube TRF
receiver circuit feeding its demodulated BCB frequency output into a
seven-tube six-channel superheterodyne BCB circuit.  The six pilot-
selectable channels could be preset between 540 to 1030 kHz.

Mike / KK5F