[R-390] Break in function

[Kenneth]

I have a Receiver Radio R-390A/URR, Electronic Assistance Corporation;  Ok I
am poking fun with the non-A discussion 8^)

The above radio is hooked to a Johnson Viking II through a TR relay.  It
does the antenna switching and it has
additional connects which I  use to operate the break in function on the
390A. I have also have had to use one of its break contacts
to shut the speaker off.  The manual, at least what I have found, is not
clear as to just how the break in functions.  The receiver is muted,
however without also turning off the speaker I get feed back.  My question
concerns the break in relay in the 390A does it just disconnect
the antenna, and mute the receiver.  Is the speaker muted as well?  When I
key the transmitter without disconnecting the speaker I get feedback.
I can switch speaker off with the TR relay so this is no problem.  I guess
what I need to know is the break in on this 390A functioning as it should.

This old Viking transmitter is a real blast to operate, AM phone of course.
It is also very touchy and I still have some work to do to it.
Can you image if a transmitter such a this came to the market today. It
takes skill to operate one of these buzzards.  If you don't know
what you are doing you can detonate it. Of course this is what make the use
of this type of equipment so much fun. Easy to fix as well.
These transmitters you have to operate,  it isn't like modern stuff which
you just turn on and say "HELLO RADIO".

                                                                     Ken de
W7ITC