[TenTec] TT 509 Argonaut Sticking Relay

[Stuart Rohre]

If the measurement of reed relay coil voltage shows a drop immediately 
on unkeying the PTT, and if degaussing the relay does not fix that, you 
may have pitted contacts that are arcing and welding with transmit 
currents..  If that turns out to be likely, replacement is the only 
solution.  This reed relay is used for changeover from transmit to receive.

Stuart Rohre
K5KVH