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To:  lml@lancaironline.net
Date: Sun, 12 Sep 2010 20:42:14 -0400
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Subject: Transponder Antenna Locations
From: lalcorn@natca.net
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I am trying to diagnose an intermittent problem with my transponder.  I bel=
ieve it is my antenna location and would like to know where most people mou=
nt their antenna's on 320/360's.  Mine was located on an aluminum bracket (=
for the ground plane) on the middle to top right side of the inside aft fus=
elage tunnel.  Slightly above and behind the aft elevator bellcrank.  I was=
 getting problems with ATC lossing me, usually when I was pointed towards t=
he radar site.  I figured the antenna was located too high and that the eng=
ine and prop were blocking it.  I bought the AAE composite transponder ante=
nna so I could temporarily place it in different spots and test it.  I moun=
ted this one farther aft and lower in the tail and it seemed to work well e=
xcept, descending into and climbing out of KHEF, they lost me from 8000 dow=
n to 2000.  Considering I was pointed opposite directions, the engine shoul=
d not have blocked it both times.  I have a KT76A transponder.  I would lik=
e to know what are the best places people have found to internally mount th=
e antenna.  My comm antenna is mounted on the belly behind the rear bulkhea=
d and the vor is internal under the baggage compartment.  Thanks in advance=
 for you help.=0A=0ALuke Alcorn=0A=0A
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<font face=3D"arial" size=3D"2">I am trying to diagnose an intermittent pro=
blem with my transponder.&nbsp; I believe it is my antenna location and wou=
ld like to know where most people mount their antenna's on 320/360's.&nbsp;=
 Mine was located on an aluminum bracket (for the ground plane) on the midd=
le to top right side of the inside aft fuselage tunnel.&nbsp; Slightly abov=
e and behind the aft elevator bellcrank.&nbsp; I was getting problems with =
ATC lossing me, usually when I was pointed towards the radar site.&nbsp; I =
figured the antenna was located too high and that the engine and prop were =
blocking it.&nbsp; I bought the AAE composite transponder antenna so I coul=
d temporarily place it in different spots and test it.&nbsp; I mounted this=
 one farther aft and lower in the tail and it seemed to work well except, d=
escending into and climbing out of KHEF, they lost me from 8000 down to 200=
0.&nbsp; Considering I was pointed opposite directions, the engine should n=
ot have blocked it both times.&nbsp; I have a KT76A transponder.&nbsp; I wo=
uld like to know what are the best places people have found to internally m=
ount the antenna.&nbsp; My comm antenna is mounted on the belly behind the =
rear bulkhead and the vor is internal under the baggage compartment.&nbsp; =
Thanks in advance for you help.<br><br><!--WM_COMPOSE_SIGNATURE_START-->Luk=
e Alcorn<br><br><!--WM_COMPOSE_SIGNATURE_END--></font>
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