[Central-Electronics] 20a Station Control

[Jeffrey Welsh]

Hi All,
I've been working on my 20a, and it must be an early version, with no
accessory contacts for AC and no scope jack.  It's a rack mount unit in
nice cosmetic shape.  I've gotten it to the point where I'm getting 5-8
watts out.

My main question relates to station control.  I'm a newbie with respect to
separate xmitter/reciever setups.  My 20a will be paired with a Viking
thunderbolt and the receiver is a Collins 75a-3.  Antenna is a new Gap
Titan DX vertical.

I've got mic PTT set up, and I'd like to automate the send/recieve paths to
the antenna.  I have suitable relays to handle the amps' output, and was
thinking of switching it based on the accessory contacts of the 20a's relay.

My concern is that when I click the mic that RF current may start flowing
from the amp before (or as) the send/recieve relay contacts close.
Is there a concern here or am I just paranoid - I'm not sure how hams did
this in the 50's.  My alternative idea is to use a footswitch for
send/recieve relay, with an interlock to prevent PTT from activating unless
the relay is in Send position.

Help is greatly appreciated!
73 jeffrey KD2AZI