On Saturday 20 November 2004 10:14 am, Kevin Custer wrote:
> A Micor Mobile antenna relay for the input power (400
> mW), and the OEM GE antenna relay used with the high
> power station (part number unknown, but it looks and is
> similar in size to a Dow Key Relay) for the "hot side" of
> the RF.
OK. I am familiar with both of those relays.
> Since these relays are driven from a 110 volt derived
> source, they simply drop out and the 110 watt PA takes
> over. It switches in a matter of milliseconds and the
> user might only tell by his "S" meter.
I wouldn't mind even a couple seconds of dropout while
things switch. It doesn't happen that often.
> They seem to. In normal practice, the antenna relays are
> actually switched prior to the channel element being
> enabled. This function was incorporated into the Station
> Control Module by using the delays already built into
> that module. While I'm not suggesting the way I do it is
> the best, and while I don't make it a practice of hot
> switching the PA's, it does work and hasn't given any
> trouble, yet; however it's only been on the air a short
> time.
Thanks for all the helpful information. I've given the
matter some thought to see if I could come up with some
sort of switching logic that would disable PTT, switch the
relays and then enable PTT. Ideally it would be nice if it
did that when the PA is switched in or out by a control
function and when AC power fails or comes back up.
Meanwhile I think I will just try some different relays
with the existing configuration and see if they hold up any
better than the DowKey type (unknown manufacturer) that I
used last time.
Paul
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