Today's Message Index:
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1. 06:51 AM - Transponder antenna separation (Roger Evenson)
2. 07:47 AM - Re: Transponder antenna separation (LessDragProd@aol.com)
Message 1
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| Subject: | Transponder antenna separation |
--> Avionics-List message posted by: "Roger Evenson" <revenson@comcast.net>
Garmin transponder install manual suggests 3' minimum between transponder antenna
and any other antenna, and also 3' minimum between transponder antenna and
transponder unit itself.
I don't have these ideals. I can locate the transponder antenna closer (than 3')
to the com antenna in order to be 3' from the transponder itself; or, I can
locate the transponder antenna closer to the transponder and maintain 3' between
the transponder antenna and the com antenna.
Having to compromise, is one criteria more important than the other?
Message 2
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| Subject: | Re: Transponder antenna separation |
--> Avionics-List message posted by: LessDragProd@aol.com
Generally, the smaller antenna is blocked by the larger antenna in the
direction of the larger antenna. The smaller antenna signal should also be
stronger in the opposite direction from the larger antenna. A greater the distance
between antennas reduces the signal strength distortion.
The larger antenna should be basically unaffected by the smaller antenna,
except that the signal could be stronger across the smaller antenna.
Hope that helps.
Jim Ayers
RV-6A mounting transponder antenna in tailcone behind baggage compartment
and using a Sportcraft Vertical Stabilizer COM antenna.
Just a few holes to patch in the fuselage belly. :-)
In a message dated 09/25/2004 6:52:33 AM Pacific Daylight Time,
revenson@comcast.net writes:
--> Avionics-List message posted by: "Roger Evenson" <revenson@comcast.net>
Garmin transponder install manual suggests 3' minimum between transponder
antenna and any other antenna, and also 3' minimum between transponder antenna
and transponder unit itself.
I don't have these ideals. I can locate the transponder antenna closer (than
3') to the com antenna in order to be 3' from the transponder itself; or, I
can locate the transponder antenna closer to the transponder and maintain 3'
between the transponder antenna and the com antenna.
Having to compromise, is one criteria more important than the other?
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