KRX3 antenna routing

[Chris G3SJJ]

Whilst I am waiting for shipping notification of my KRX3, I have a
question on routing.

I have a specific contest application coming up where we will be using
SR2O. The idea is for the 2nd op to be monitoring a band other than the
Run band. We are only allowed one antenna and have designed it such that
the KAT3 will handle all the impedance presented on the various bands. I
had hoped that the K3/KAT3/KXV3/KR3X antenna routing would allow us to
connect the 2nd rx directly to the antenna
 and not via the ATU. Studying the manual I can't see how that can be
done. Can anyone confirm this?

If not, I can make up a small relay box which takes a feed off the
antenna input to Ant 1 socket and feeds it to Aux RF on receive and
grounds Aux RF on transmit and I can switch it via the PA PTT switch on
my mHam Keyer. An internal switching solution would be more sophisticated!

Chris G3SJJ
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[Dave, G4AON]

Chris another issue is the external RX "RF OUT" from the KXV3 is routed
via the TX low pass filter. For example listening on an external
receiver on 80m is OK unless the K3 is on 160m, etc.

73 Dave, G4AON

I have a specific contest application coming up where we will be using
SR2O. The idea is for the 2nd op to be monitoring a band other than the
Run band. We are only allowed one antenna and have designed it such that
the KAT3 will handle all the impedance presented on the various bands. I
had hoped that the K3/KAT3/KXV3/KR3X antenna routing would allow us to
connect the 2nd rx directly to the antenna
and not via the ATU. Studying the manual I can't see how that can be
done. Can anyone confirm this?

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[Alan Bloom]

It should work fine as long as the receiver is on a lower band than the
transmitter because the ATU is low-pass in nature.

Al N1AL


On Thu, 2008-08-07 at 09:59, Chris G3SJJ wrote:

> Whilst I am waiting for shipping notification of my KRX3, I have a
> question on routing.
>
> I have a specific contest application coming up where we will be using
> SR2O. The idea is for the 2nd op to be monitoring a band other than the
> Run band. We are only allowed one antenna and have designed it such that
> the KAT3 will handle all the impedance presented on the various bands. I
> had hoped that the K3/KAT3/KXV3/KR3X antenna routing would allow us to
> connect the 2nd rx directly to the antenna
>  and not via the ATU. Studying the manual I can't see how that can be
> done. Can anyone confirm this?
>
> If not, I can make up a small relay box which takes a feed off the
> antenna input to Ant 1 socket and feeds it to Aux RF on receive and
> grounds Aux RF on transmit and I can switch it via the PA PTT switch on
> my mHam Keyer. An internal switching solution would be more sophisticated!
>
> Chris G3SJJ

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[Chris G3SJJ]

Hmm, that would be nice but I suspect we will mostly be running on a
lower band and searching for QSOs on a higher band. Eg, running 20m,
searching 10/15, running 40 searching 20, running 80 searching 40/20. If
we had a decent opening on 15/10 it might work. Thanks for the thought Al.

Chris G3SJJ (GU4CHY/P - IARU Region 1 SSB Field Day 6/7 September)



Alan Bloom wrote:

> It should work fine as long as the receiver is on a lower band than the
> transmitter because the ATU is low-pass in nature.
>
> Al N1AL
>
>
> On Thu, 2008-08-07 at 09:59, Chris G3SJJ wrote:
>  
>> Whilst I am waiting for shipping notification of my KRX3, I have a
>> question on routing.
>>
>> I have a specific contest application coming up where we will be using
>> SR2O. The idea is for the 2nd op to be monitoring a band other than the
>> Run band. We are only allowed one antenna and have designed it such that
>> the KAT3 will handle all the impedance presented on the various bands. I
>> had hoped that the K3/KAT3/KXV3/KR3X antenna routing would allow us to
>> connect the 2nd rx directly to the antenna
>>  and not via the ATU. Studying the manual I can't see how that can be
>> done. Can anyone confirm this?
>>
>> If not, I can make up a small relay box which takes a feed off the
>> antenna input to Ant 1 socket and feeds it to Aux RF on receive and
>> grounds Aux RF on transmit and I can switch it via the PA PTT switch on
>> my mHam Keyer. An internal switching solution would be more sophisticated!
>>
>> Chris G3SJJ
>>    
>
>
>
>
>  

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