We have 2M packet node transceivers at a new government radio site.
The
new site owner requires isolators be installed on all transmitters.
As you might surmise, it doesn't seem possible to do so on a simplex
one RF port radio such an Alinco DR-135.

Anyone out there with some realistic suggestions on how we might
manage
to do this?

Ed K7AAT



Thanks to those who have responded already. I was hoping for some
elegant solution I had not thought of, but so far nothing has come to
light. Also I was hoping there would be some way to implement this
wihthout relays.... but maybe not.

Regarding the comment about breaking out the Rx line to a separate
output... that might be possible but its solid state switching and would
be somewhat tricky to implement right after this solid state PA module
output.

One reason I hate the thought of adding antenna relays to switch the Rx
around the isolator is that this is a busy packet node and I don't like
the reliability issues a couple of added relays might add to a presently
solid state switched radio.. . although I could do this if forced to.

We have operated at this site since before the new vault was built and
all present customers simply moved over to it so to answer the question
posed, no ... no calculations have been done... but the new owner
"requires" isolators. The best solution for this situaion might be to
gather a few respected technical persons who this non-technical site
owner is familiar with and perhaps convince him this isn't necessary.

OR.. we could easily add a pass cavity of two and hope that this
would passify him.

We will see.

I'm still open to another other new or inovative solutions.

Thanks.

Ed K7AAT