[ARC5] How did HF command receivers net with transmitters?

[Mike]

The HF liason sets SCR-287 and AN/ARC-8 generally had a "NORMAL-MONITOR"
switch near the receiver that performed the following:

NORMAL - HV to some stages of the BC-348 is removed when the transmitter
is keyed (receiver disabled during transmit); SIDETONE from the
transmitter is applied to the interior communication system (output of
the receiver) when the transmitter is keyed.

MONITOR - HV is applied to all stages of the BC-348, even when the
transmitter is keyed (receiver is functional, though the ANTENNA input
will still be grounded when the transmitter is keyed); SIDETONE from the
transmitter is removed.

Obviously, the purpose of the MONITOR position is to allow the receiver
to be adjusted, while the transmitter is keyed, to the output of the
transmitter.

My question is:  How were the HF receivers of the ARA / SCR-274 /
ARC-5(when not fixed-tuned) command sets adjusted to the transmitter
frequency?  The operating information contained in the manuals for these
sets don't seem to address specifically how the receiver is adjusted to
the transmitter frequency, other than by relying on the dial calibration
of each.  Though a NORMAL/MONITOR switch would have been very simple to
install near the receiver control box that would disable the operation
of the receiver sidetone relays in the receiver rack, I've never seen
any documentation that such a switch was ever employed in these command
set installations.  

Perhaps tuning the receiver to the nominal transmitter setting was
sufficient, given the broad selectivity of the HF command receivers.

BTW, I have a B-24D Radio Installation book published in 1943 by
Consolidated Aircraft.  The wiring diagram for the SCR-287 does NOT show
a NORMAL-MONITOR switch, but pictures of the receiver desk position
point out the location of this switch between the right side of the
BC-348 and the J-37 transmitter key.  This book is NOT particularly
consistent in content on this and other topics, which surprised and
disappointed me.

Mike / KK5F