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From: Dave Saylor <dave.saylor.aircrafters@gmail.com>
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Subject: Re: [LML] Legacy Com Antenna
X-Original-To: Lancair Mailing List <lml@lancaironline.net>
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Dean,

It is possible to use a single comm antenna but it takes something like
this:

http://www.aircraftspruce.com/catalog/avpages/comantswtich601.php

It's not a very common installation and it's a lot more expensive than a
second antenna!

My layman's understanding is that transmissions from one radio become
over-powered receptions to the other radio.  So most commonly, two comms
each use a dedicated antenna.

On a Legacy, the second antenna can go aft of the primary.  It needs to be
centered a minimum of two antenna lengths from the other comm antenna.
That makes it a challenge to use a straight antenna as it may hit the
ground before the tail tie-down.  We've put an antenna in that area, and we
may have ended up using a bent whip like a Comant CI-122.

Nav antennas can be split without worry.

Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell


On Fri, Dec 30, 2011 at 9:07 AM, Dean Whiting <dean.whiting@gmail.com>wrote:

> I was looking for some advice about communication antennas.  The legacy is
> setup to have one com antenna.  We want a capable IFR airplane and I am
> hesitant to have one antenna with a diplexer (or is it duplexer, I've seen
> it both ways) as a possible single point of failure.  Is this the method
> that most people are using?  If you mounted a 2nd com antenna, where did
> you place it?  I searched the archives and found someone else who asked the
> same question but I couldn't find the answer.  Any other input or advice on
> the subject would be appreciated.
>
> Dean Whiting
>
> --
> For archives and unsub http://mail.lancaironline.net:**
> 81/lists/lml/List.html<http://mail.lancaironline.net:81/lists/lml/List.html>
>

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Dean,<br><br>It is possible to use a single comm antenna but it takes somet=
hing like this:<br><br><a href=3D"http://www.aircraftspruce.com/catalog/avp=
ages/comantswtich601.php">http://www.aircraftspruce.com/catalog/avpages/com=
antswtich601.php</a><br>

<br>It&#39;s not a very common installation and it&#39;s a lot more expensi=
ve than a second antenna!<br><br>My layman&#39;s understanding is that tran=
smissions from one radio become over-powered receptions to the other radio.=
=C2=A0 So most commonly, two comms each use a dedicated antenna.<br>

<br>On a Legacy, the second antenna can go aft of the primary.=C2=A0 It nee=
ds to be centered a minimum of two antenna lengths from the other comm ante=
nna.=C2=A0 That makes it a challenge to use a straight antenna as it may hi=
t the ground before the tail tie-down.=C2=A0 We&#39;ve put an antenna in th=
at area, and we may have ended up using a bent whip like a Comant CI-122.<b=
r>

<br>Nav antennas can be split without worry.<br><br clear=3D"all">Dave Sayl=
or<br>AirCrafters<br>140 Aviation Way<br>Watsonville, CA 95076<br>831-722-9=
141 Shop<br>831-750-0284 Cell<br>
<br><br><div class=3D"gmail_quote">On Fri, Dec 30, 2011 at 9:07 AM, Dean Wh=
iting <span dir=3D"ltr">&lt;<a href=3D"mailto:dean.whiting@gmail.com">dean.=
whiting@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote=
" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

I was looking for some advice about communication antennas. =C2=A0The legac=
y is setup to have one com antenna. =C2=A0We want a capable IFR airplane an=
d I am hesitant to have one antenna with a diplexer (or is it duplexer, I&#=
39;ve seen it both ways) as a possible single point of failure. =C2=A0Is th=
is the method that most people are using? =C2=A0If you mounted a 2nd com an=
tenna, where did you place it? =C2=A0I searched the archives and found some=
one else who asked the same question but I couldn&#39;t find the answer. =
=C2=A0Any other input or advice on the subject would be appreciated.<span c=
lass=3D"HOEnZb"><font color=3D"#888888"><br>


<br>
Dean Whiting<br>
<br>
--<br>
For archives and unsub <a href=3D"http://mail.lancaironline.net:81/lists/lm=
l/List.html" target=3D"_blank">http://mail.lancaironline.net:<u></u>81/list=
s/lml/List.html</a><br>
</font></span></blockquote></div><br>

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