[Milsurplus] [MRCA] BC-611 Operational Question

[Mark K3MSB]

I was not even remotely implying that my SCR-274N used in the feld was
authentic.   Clearly it is not.    I would be taking it into the field (in
a tent) to show (demo) a working WW II USAAF Radio Set.   It will be
explained that it was an airborne system used on Allied aircraft.   They
will have a small 117 generator available for powering the power supply I
bring along (which is my 28V power supply with two tractor batteries
floated across the output).    I of course will not be demoing it all the
time;  in the off times I suggested that just the two batteries could power
the Navigation receiver (0.19 to 0.55) tuned to a beacon.   Still in the
early planning stages.....

Mark K3MSB











On Wed, Oct 2, 2024 at 7:14 PM MARK DORNEY via MRCA <mrca at mailman.qth.net>
wrote:

>     About the only time an SRC-274-N would have been mobile would have
> been if the set was mounted in an aircraft. The SCR-274-N wasn’t really
> designed for use on the ground in the field. The set isn’t rugged enough to
> really withstand the rigors of field use and is not sealed against
> weather.  Power supply would also have been a problem since 24 volt vehicle
> electrical systems ( required to power up an SCR-274-N ) didn’t really come
> into use with US Army Ground Forces until the Korean War. During WW2, radio
> equipped vehicles had mostly 12 volt power systems ( 6 volt could be used ,
> but there were problems keeping a 6 volt equipped radio vehicle’s battery
> charged in the field ).  There were very limited 12 volt versions of the
> SRC-274 type radios, but they were very few and far between, and by the
> beginning of 1943, the USAAF had converted almost all of their aircraft (
> and all of their new aircraft ) to operate using 24 volt electrical
> systems, 12 volt aircraft liaison sets simply were no longer supplied to
> the USAAF overseas (the USN converted their aircraft sooner ). Another
> problem you might encounter using these few 12 volt powered aircraft radio
> systems is the limited frequency range the early radios used. You may not
> find a transmitter with a frequency range legal for you to use. Of the USN
> radios, the Western Electric GF-11/RU-16 is a 12 volt radio that comes to
> mind, but that set, while designed as an aircraft radio, wasn’t really
> fielded as an aircraft radio ( only documented use was on USMC ships - I
> didn’t know the Marines had ships, and by one USMC Artillery Battalion on a
> motor gun carriage). now I suppose a scavenged aircraft APU could be used
> to power your SCR-274-N, but as far as any standard vehicle was concerned,
> the options would have been very limited. Scavenged liaison radios like
> your SCR-274-N could be found in airfield watch stations, but were powered
> either using a rectifier ( if that could be found) or much more commonly a
> battery bank of scavenged automobile batteries.
>
> 73
> Mark D.
> WW2RDO
>
> “In matters of style, float with the current. In matters of Principle,
> stand like a rock. “.   -   Thomas Jefferson
>
> Sent from my iPhone
>
> On Oct 2, 2024, at 6:00 PM, MARK DORNEY via MRCA <mrca at mailman.qth.net>
> wrote:
>
> efficient on the 60 meters ( the short antenna on the BC-611 is better
> suited to that frequency band ). Unfortunately, the bandwidth the
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