[Milsurplus] Re: [ARC5] SCR-274-N Transmitter Dial Accuracy

[J Forster]

That's the genius of the BC-221. The same master oscillator is used to
set both the receiver (with radiation from the MO) and of transmitter
(beating against the MO). Nothing is switched in the MO circuit, and,
being battery powered, it could likely be taken from plane to plane
while operating to set/check all the sets before a mission.

Very elegant, IMO.

Best,
-John

===================

Neil wrote:

> Mike Morrow wrote:
> >
> >> [snip]
> >> I have often wondered how the users of the MF/HF commands sets
> >> netted the receiver to the associated transmitter, since there is
> >> no MONITOR/NORMAL switch such as is found on the SCR-287-A and
> >> AN/ARC-8 UASSF liason sets which allows the receiver to monitor
> >> the output of the transmitter.  [snip]
>
> Why would a pilot want to net his receiver to his own transmitter?
> Doesn't it make more sense for the Squadron Leader to key his
> transmitter and all pilots turn on their BFO's and zero beat to him?
> That process puts everyone's receiver on the same frequency.
> Of course it doesn't ensure that their transmitters are all on the
> same frequency, but they are not adjustable by the pilot and must
> have been calibrated by the pre-flight ground crew anyway.
>
> 73 de Neil ZL1ANM