I interpreted the question to mean that he is transmitting legal limit into
his tx antenna, he has a receive antenna feeding the subreceiver through
the rx antenna jack on the rear, and he wants to know if he needs to add
external isolation/protection of the rx antenna during transmit.
It's a good question that's come up before but I confess to not
knowing/remembering the authoritative answer. Conventional wisdom is to
add external isolation/protection.
73, Barry N1EU
On Wed, Dec 6, 2017 at 7:24 PM, Ken Brown <kenradiobrown@gmail.com> wrote:
> There should never be "legal limit" power level on any transceiver antenna
> port. The maximum power level should be the transceiver's transmit power,
> and it should only be on the tx/rx port when transmitting. The internal
> switching in the transceiver will keep that transmit power out of the
> receiver front end. There should never be any RF power other than receive
> signal levels from the antenna feeding into any antenna port on a
> transceiver.
>
> Perhaps I am misunderstanding your question. How/why would you ever have
> legal limit RF power going IN to your transceiver?
>
> DE N6KB
>
> On Wed, Dec 6, 2017 at 7:05 AM, Sandor Wetsel <kg4fet@bellsouth.net>
> wrote:
>
> >
> > I have blown front ends on radios before so for me this is a concern. Is
> > the isolation of the Sub receiver good enough to protect it from a legal
> > limit transmission on the Main? This would be using either antenna port
> for
> > the SUB RX antenna. I did not want to assume now that I am into this
> (565)
> > rig a week now.
> >
> > Thanks es Merry Cristmas
> >
> > Sandor KG4FET
> >
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> >
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