PX3 - qrm on VHF?

[Graham Kimbell]

In the past, users have reported qrm radiated from the P3 display,
particularly on 2m.  Has anyone had this problem with the PX3?  If so,
were you using the KX3 internal transverter or an external one?

Graham
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[ejkkjh]

Graham,
I use the PX3 with the KX3 2 meter internal transverter and I hear, see no
QRM from the PX3.
Very quiet and PX3 sure helps in knowing what is on the band.  73
Emory  WM3M

-----Original Message-----
From: Graham g3tct
Sent: Sunday, May 10, 2015 12:32 PM
To: Elecraft reflector
Subject: [Elecraft] PX3 - qrm on VHF?

In the past, users have reported qrm radiated from the P3 display,
particularly on 2m.  Has anyone had this problem with the PX3?  If so,
were you using the KX3 internal transverter or an external one?

Graham
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[Jim Brown-10]

On Sun,5/10/2015 1:19 PM, Walter Underwood wrote:
> The KX3 can radiate some VHF from the antenna connector, even during receive.

And also from cables connected to the ACC and I/Q connectors -- because
they are insulated from the enclosure, they are a Pin One Problem.

73, Jim K9YC
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[Graham Kimbell]

Thanks everyone for replies.  I have only one reply from Emory saying no
qrm from PX3. Any others want to chip in on whether they get qrm on VHF
from the PX3 specifically?

Jim, that figures - I have found problems connecting the KX3 to a USB
sound card, when I have to use an audio isolator to stop the spectrum
being filled with carriers. And even then it's not perfect.

Graham G3TCT

On 19:59, Jim Brown wrote:

> On Sun,5/10/2015 1:19 PM, Walter Underwood wrote:
>> The KX3 can radiate some VHF from the antenna connector, even during
>> receive.
>
> And also from cables connected to the ACC and I/Q connectors --
> because they are insulated from the enclosure, they are a Pin One
> Problem.
>
> 73, Jim K9YC
>

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[Jim Brown-10]

On Mon,5/11/2015 1:09 PM, Graham g3tct wrote:
> Jim, that figures - I have found problems connecting the KX3 to a USB
> sound card, when I have to use an audio isolator to stop the spectrum
> being filled with carriers. And even then it's not perfect.

A good common mode choke and proper chassis-to-chassis bonding is
probably a less expensive solution. With that bonding, there should be
no need for an audio isolator, and the right choke should kill any RF.

73,
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