K3. 28MHz listen on 144MHz

[f4aag]

Hello all,
I use a k3 equipped module 144. I can observe when a signal is present
on the QRO 28MHz is also heard on 144MHz.
This is it normal or transceiver is failing.

F4AAG Eric
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[Felipe Ceglia - PY1NB-2]

Hello,

I could notice that the RF isolation between TX antenna ports and RX
antenna ports is not great.

For example, a S9+ level on main antenna will be clearly present when you
are using RX ANT.

If you have something connected to ANT2 or RX ANT, this might well be the
case.

73,

Felipe Ceglia - PY1NB
-------------------------------------------------------------------------------------
PR1T team member /// Rio DX Group member /// Araucaria DX Group member
http://dxwatch.com /// http://reversebeacon.net /// http://riodxgroup.com



On Tue, Jul 17, 2012 at 1:46 AM, F4AAG <[hidden email]> wrote:

> Hello all,
> I use a k3 equipped module 144. I can observe when a signal is present
> on the QRO 28MHz is also heard on 144MHz.
> This is it normal or transceiver is failing.
>
> F4AAG Eric
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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[Oliver Dröse]

Eric,

unfortunately this is normal due to low isolation between HF and TRV ports
in the K3. :-( Only way to cure it is disconnect HF antenna when using the
internal 2 m transverter (or use a relay to switch it off externally instead
of completely disconnecting it).

73, Olli - DH8BQA



----- Original Message -----
From: "F4AAG" <[hidden email]>
To: <[hidden email]>
Sent: Tuesday, July 17, 2012 6:46 AM
Subject: [Elecraft] K3. 28MHz listen on 144MHz

> Hello all,
> I use a k3 equipped module 144. I can observe when a signal is present
> on the QRO 28MHz is also heard on 144MHz.
> This is it normal or transceiver is failing.
>
> F4AAG Eric
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
> -----
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> 16.07.2012
>

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[f4aag]

to highlight the lack insulation between the connectors HF and VHF, I
injected into the HF input a level of-70dBm. The carrier was then heard
on 2 meters with a level S2. I am surprised that the insulation is not
better on the K3. DH8BQA proposed disconnect the HF input when using the
VHF band, which must be very efficient but not very practical. Has
anybody there another solution.
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