[TenTec] receiver isolation

[Kim Elmore]

I use the DX Engineering Receiver Guard for jut this purpose. I have K9AY receive loops about 60-70 ft from my F12 Sigma 80 OCF vertical dipole. So far, everything has been fine. 

Kim N5OP

"People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith

> On Dec 6, 2017, at 14:11, Barry N1EU <barry.n1eu at gmail.com> wrote:
> 
> 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 at 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 at 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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