Intermittant feedback fix incorporated
This morning (FD!) a small board with timing and switching logic was incorporated in the PORT-2 I/O for the W8TVC/r RC210.
Apparently, the RC210 would on occasion open up the audio path from the received PORT-2 audio during times when it was also transmitting on PORT-2 with the audio from PORT-1. This isn't supposed to happen, but it does. Usually this manifestation takes a few minutes of PORT-1 'key down' to start and commences with a popping sound and then opens up into a really swell echoey feedback until the Port-1 signal dissappears. The feedback loop included the Empire systems.
The added board simply disconnects the incoming (from the W8TVC RC210 port2 perspective) COS and audio whenever there is PTT asserted on port2. An additional timer is incorporated so that these inputs are not returned to active for a full second after outbound PTT ceases, this should take care of the effects of audio delays and switching times.
73 John KF8KK