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09-16-2016, 12:16 PM
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Join Date: Dec 2011
Location: Kirkland, WA
Posts: 886
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Avoiding kicking the transponder antenna cable
Is there much risk in kicking the transponder cable or BNC connector while flying? Seems like many people position the transponder antenna under the rudder pedal area, so how does one avoid kicking the cable? Are they far enough forward that you just never really reach it?
Thanks,
Russ
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09-16-2016, 12:33 PM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,183
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-7A
I considered the forward location but opted to put them under the gear weldments in my -7a. It is virtually impossible to kick in this location and provided for the shortest cable run down the sides (ADS-B on left, Transponder on right).
__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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09-16-2016, 01:12 PM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,957
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Quote:
Originally Posted by grayforge
Are they far enough forward that you just never really reach it?
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In a word: yes.
__________________
Kurt W.
RV9A
FLYING!!!
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09-16-2016, 01:28 PM
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Join Date: Dec 2011
Location: Kirkland, WA
Posts: 886
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Ah, one thing that was confusing me was mention of the 3' minimum mounting distance of the antenna from the transponder. I think I had it backwards and assumed it had to be within 3'. But now I realize it must be greater than 3' away... correct?
Thanks,
Russ
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09-16-2016, 02:20 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,514
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More than 3' - also I nearly got in trouble with the GPS under cowl and the transponder near the FW. I had to go measure. Yikes, I did not want to move it.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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09-16-2016, 02:34 PM
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Join Date: Sep 2011
Location: Edgewater, FL. KSFB
Posts: 1,116
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Russ,
I don't see what plane you are building but it is very, very common to use that forward spot with the 6, 7 and 9. Way too far forward to ever kick it.
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09-16-2016, 02:34 PM
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Join Date: Oct 2012
Location: Clearwater, FL KCLW
Posts: 1,281
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Unless you plan to tuck your feet behind the rudder pedals for some reason, it isn't an issue. At least, it sure isn't for me.
Chris
__________________
Chris Johnson
RV-9A - Done(ish) 4/5/16! Flying 4/7/16
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09-16-2016, 05:07 PM
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Join Date: Dec 2011
Location: Kirkland, WA
Posts: 886
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Sounds good. I'm building a 7A and will place the Transponder and ADS-B antennas at opposite corners at the bottom of the forward fuselage.
Looks like I'll have to put the Transponder antenna on the right since the Transponder is on the left under the sub-panel and would be within 3'. Might even be within 3' on the right. Hmmm...
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09-17-2016, 07:08 AM
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Join Date: Jan 2005
Location: San Antonio, TX
Posts: 1,024
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You might want to check required separation between the txp and ads-b antenna.
If I remember correctly Navworx wants 4 feet. Other manufacturers may vary.
__________________
Steve Formhals
A&P, Tech Counselor & Flight Advisor
RV3B
RV8
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09-18-2016, 08:03 AM
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Join Date: Sep 2011
Location: Edgewater, FL. KSFB
Posts: 1,116
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To get proper separation I put the ADS-B antenna behind the cargo area.
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