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-   -   Avoiding kicking the transponder antenna cable (https://vansairforce.net/community/showthread.php?t=141936)

grayforge 09-16-2016 12:16 PM

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

Raymo 09-16-2016 12:33 PM

-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).

krw5927 09-16-2016 01:12 PM

Quote:

Originally Posted by grayforge (Post 1112206)
Are they far enough forward that you just never really reach it?

In a word: yes.

grayforge 09-16-2016 01:28 PM

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

BillL 09-16-2016 02:20 PM

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.

MarkW 09-16-2016 02:34 PM

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.

YellowJacket RV9 09-16-2016 02:34 PM

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

grayforge 09-16-2016 05:07 PM

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...

sf3543 09-17-2016 07:08 AM

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.

MarkW 09-18-2016 08:03 AM

To get proper separation I put the ADS-B antenna behind the cargo area.


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