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ADS600-B vs. Transponder Antenna Locations...

 
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Matt Dralle
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Joined: 08 Nov 2005
Posts: 26320
Location: Livermore CA USA

PostPosted: Sun Jul 22, 2012 6:09 pm    Post subject: ADS600-B vs. Transponder Antenna Locations... Reply with quote

Dear Listers,

The manual for the NavWorx ADS600-B says that the normal transponder antenna and the UAT antenna "MUST be at least 5 feet apart". On an RV-8, that presents somewhat of a problem. Realistically, the farthest forward you can mount a transponder fin is just behind the main spar under the aileron pushrods. 5 feet back from that point is right under the rear-mounted battery box! That means that the next realistic place is right behind the elevator bellcrank and behind bulkhead F-808. The coax w/ TNC connector on one end that comes with the ADS600-B is just long enough to make it to the forward position. I was thinking of mounting the transponder antenna (Garmin GTX-237) in the aft position as described above and using RG-400.

But that's pretty far back for a transponder antenna. I've never seen one mounted there before. Any reason why I wouldn't want to mount it there?

The only other option would be to mount it out on the wing somewhere to maintain the 5' separation. But that's even goofier, it seems to me...

Thoughts?

Thanks,

-
Matt Dralle

RV-8 #82880 N998RV "Ruby Vixen"
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jhclarkfl



Joined: 17 Jan 2009
Posts: 9
Location: Pensacola, FL

PostPosted: Thu Aug 23, 2012 1:44 am    Post subject: Re: ADS600-B vs. Transponder Antenna Locations... Reply with quote

I'm building an RV-8A. Placing antennae are challenges. I placed my transponder approximately under the passenger seat. I installed the ADS-B antenna in the tail just before the last bay. This worked well for me since the ADS-B is mounted in the tail. Both of my antennae are from Papa Delta. I can't attest as to how well they work because they have not been tested but I do like the way they look.

This is the ADS-B installation location:

http://www.mykitlog.com/users/display_log.php?user=jackclark&project=211&category=6250&log=117079&row=167

This is my transponder location:

http://www.mykitlog.com/users/display_log.php?user=jackclark&project=211&category=6250&log=117083&row=164


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Jack Clark
RV-8A Fuselage
http://www.mykitlog.com/jackclark/
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