On Mon, 3 May 2004 23:59:10 -0500, "Cowboy67"
wrote:

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 send puts the receiver in standby, filaments remain on but that is
about all. I suspect it disconnects the B+, or at least mutes the
audio. The idea is that when you are transmitting on the same antenna
even with a T-R switch, you really don't want the receiver active. It
isn't good for the receiver, or you ears.