Garmin 340 Audio Panel Split Com

Does anyone out there have experience with Garmin's 340 audio panel and
its feature that lets you split the Com 1 and Com 2 so that the pilot
can talk/receive on one while the co-pilot can talk and receive on a
separate frequency on another? It is called the "Com 1/2" button.
On my installation, the co-pilot experienced that Com 2 reception was
blocked with I was talking on Com 1. That is not how it is supposed to
work. I have been told by one avionics shop that it is difficult to not
have Com1/Com2 interference and that I should just write-off this
feature. Another shop said that the Com 1 and Com 2 antenna's had to be
relocated so that they were on opposite sides of the plane (one op top
and one on bottom). I am not sure what to believe at this point. Any
advice or experience that folks have had would be appreciated.

-Sami
N2057M Piper Turbo Arrow III

O.,

> I have been told by one avionics shop that it is difficult to not
> have Com1/Com2 interference and that I should just write-off this
> feature. Another shop said that the Com 1 and Com 2 antenna's had to be
> relocated so that they were on opposite sides of the plane (one op top
> and one on bottom).
>

We have been told the same thing. Our antennas are both on top and we have
similar problems.

--
Thomas Borchert (EDDH)

My 340 does the same thing if the frequencies are close together. I
can't say what the spread needs to be but have noticed that if they
are close the odds of blocking are more pronounced.

Jack
Sundowner - N6363U


"O. Sami Saydjari" <ssaydjari@m> wrote in message news:<1013r3usdplec86@corp.supernews.com>...
> Does anyone out there have experience with Garmin's 340 audio panel and
> its feature that lets you split the Com 1 and Com 2 so that the pilot
> can talk/receive on one while the co-pilot can talk and receive on a
> separate frequency on another? It is called the "Com 1/2" button.
> On my installation, the co-pilot experienced that Com 2 reception was
> blocked with I was talking on Com 1. That is not how it is supposed to
> work. I have been told by one avionics shop that it is difficult to not
> have Com1/Com2 interference and that I should just write-off this
> feature. Another shop said that the Com 1 and Com 2 antenna's had to be
> relocated so that they were on opposite sides of the plane (one op top
> and one on bottom). I am not sure what to believe at this point. Any
> advice or experience that folks have had would be appreciated.
>
> -Sami
> N2057M Piper Turbo Arrow III