Today's Message Index:
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1. 12:25 PM - Re: Antenna grounding (Robert L. Nuckolls, III)
2. 01:13 PM - Re: Antenna grounding (Michael Lazarowicz)
3. 04:35 PM - Re: Antenna grounding (user9253)
Message 1
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| Subject: | Re: Antenna grounding |
At 08:20 AM 6/10/2016, you wrote:
>One other question if you cont mind.=C2 I am
>using RG400 for my ADSB and with all this
>antenna location I may have to add about 6 " to
>the ADSB cable.=C2 Its already about 12 feet
>long.=C2 This is just ADSB in so not
>transmission.=C2 How much will I loose if I
>extend the cable with a interconnect fitting
>?=C2 I got into this long length because of the
>transponder being in the back.=C2
6 inches? The losses added by 6" plus
connector to an existing 12' run cable
would be difficult to measure much less
observe in practice.
A 12' length of RG400 will toss off about
40% of your transmit/receive signals at
transponder frequencies . . .
http://tinyurl.com/hdphfdv
. . . again, probably not enough to be
observed in practice. But at Beech, we'd use
something more like LMR-400 for a loss of
about 15%. There are probably sellers
on eBay that would custom assemble a
cable for you.
What model transponder are we talking about.
I like to read the wordage in the manual
associated with antenna locations.
Bob . . .
Message 2
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| Subject: | Re: Antenna grounding |
Hi Bob,
I am not speaking of the Transponder antenna. Mine will bee around 40"
long with RG400. What referring to is the ADSB inn on The Garmin
GRT39.remote I does not specify or give any antenna lengths. max or
minimum. Teh RV8 bottom make mounting all this stuff 2 Comm antennas one
transponder antenna and on ADSB Antenna. Basically Garmin wants them all
3feet or better apart. Since I mounted the transponder box itself a GTS
23ES in back I am fighting the distance Garmin wants between the Unit and
the Transponder antenna 3 feet. To add tomy problem I have the
Magnetometer in the tail and as I mentioned previously Garmin has concerns
that my transponder antenna may be too close to the Magnetometer.
I have it set up so I can switch the cables of the ADSB antenna and the
Transponder antenna. The transponder is no big deal but my ADSB unit is up
front and I already have it run. I was just a small amount short if I do
the switch, so I was wondering if I was stretching the limits of the length
of the ADSB in.
In the End I will just hook it up and do the checks . Just trying to keep
the crawling in back and re routing of wire to a minimum.
The units are Transponder GTS 23ES,
ADSB GRT39 R
Thanks
On Sat, Jun 11, 2016 at 3:23 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 08:20 AM 6/10/2016, you wrote:
>
> One other question if you cont mind.=C3=82 I am using RG400 for my ADSB
and
> with all this antenna location I may have to add about 6 " to the ADSB
> cable.=C3=82 Its already about 12 feet long.=C3=82 This is just ADSB in
so not
> transmission.=C3=82 How much will I loose if I extend the cable with a
> interconnect fitting ?=C3=82 I got into this long length because of the
> transponder being in the back.=C3=82
>
>
> 6 inches? The losses added by 6" plus
> connector to an existing 12' run cable
> would be difficult to measure much less
> observe in practice.
>
> A 12' length of RG400 will toss off about
> 40% of your transmit/receive signals at
> transponder frequencies . . .
>
> http://tinyurl.com/hdphfdv
>
> . . . again, probably not enough to be
> observed in practice. But at Beech, we'd use
> something more like LMR-400 for a loss of
> about 15%. There are probably sellers
> on eBay that would custom assemble a
> cable for you.
>
> What model transponder are we talking about.
> I like to read the wordage in the manual
> associated with antenna locations.
>
> Bob . . .
>
Message 3
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| Subject: | Re: Antenna grounding |
Another RV-8 builder posted:
> I previously installed my transponder antenna under the RV 8 baggage floor on
the left side. I mounted my Navworx ADSB antenna next to the innermost inspection
cover on the right wing. This gave me the suggested 5 foot distance between
the two and minimized cable length. Works like a charm.
> Don
http://www.vansairforce.com/community/showpost.php?p=788980&postcount=12
Manufacturer's lawyers probably specify the minimum distance between various aircraft
antennas. And that distance is probably greater than necessary.
Bob, how far apart should a 1090 MHz transmitting antenna be from a 978 MHz receiving
antenna? And how far should a transponder antenna be from a com antenna?
Thanks
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457041#457041
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