Hi Terry,
If I understand what you are after, consider an antenna coax
switch box, like the old Heathkit 6-position switch, or similar.
Here I connect a Triton IV, Corsair II and Omni VI+ to the coax
switch and the common-out of the switch goes to the Titan amp.
When I select a rig using the coax switch, the other two positions
are gounded. Simple, with no fear of relay failure. Any one of
the three rigs can listen or send on the same antenna, but not
at the same time, of course.
I mounted a wafer switch on the shaft of the coax switch, so when
I select a rig, the keying line and speaker feed are switched to a
common output, so the key line and speaker feed are always
associated with the selected rig. My setup here is for CW only.
On Wed, 26 Apr 2000 Terry writes:
>
> Does anyone know what the relay is at the output of the Corsair or
> OMNI VI
> rigs? The manufacturer/type does not appear on the schematic and my
> old
> eyes don't easily read information on the relay in the rig. I want
> to
> build an outboard switch keyed by the keyer to bypass the rig -
> i.e., an
> external T/R relay so that I can connect my second rig in parallel
> for
> receiving on the same antenna, but shorting the second rig's input
> to
> avoid damage when transmitting. I also need to open the connection
> to
> the second rig when transmitting so that the output of the first rig
> is
> not shorted to ground by the first relay. The second relay needs, I
> think,
> to be similar to that used at the output of the rig.
>
> Terry Zivney, N4TZ/9
>
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