"Cowboy67" wrote in message ...
Howdy all,

My brother-in-law just gave me a Hallicrafter S-20R receiver. I am trying
to gather some info regarding it. My question to you is...If this is a
receiver, then why the toggle switch for send and receive? What does this
do?

Thanks in advance!

The S-20R receiver was often used by hams along with a separate
transmitter.
The toggle switch was used to disable the receiver when transmitting
so that
it would not overload, feedback, or burn out something. I do not have
a schematic handy, but I think the switch turns off the B+. When using
the S-20 as a receiver only, just leave thge switch on receive and
forget it.