Home > VansAirForceForums

- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

Go Back   VAF Forums > Model Specific > RV-7/7A
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Thread Tools Search this Thread Display Modes
Old 10-28-2018, 12:19 PM
gmcjetpilot's Avatar
gmcjetpilot gmcjetpilot is offline
Join Date: Jan 2005
Posts: 3,820

I think there is a tad of over worry about all this, but following the
recommendations from the manufacture is almost always a good idea.

RV's are small planes and there are limited places to place antennas. With gear
legs, com antenna, firewall, wing spar, exhaust, there is only so much real-estate.

What ever you do will be a compromise. However you are not flying in the +FL180
altitudes, and your transponder will be able to communicate just fine with Mode C
and ADS-B...

RG-400 is pretty awesome stuff. I am not sure what Grarmin sells that cost more.
There are only so many 0.195 OD, 50 ohm, RF coaxials, and RG-400 is king (I thought).
RG-400 is a step up from RG-142 with solid core wire. RG-142 and RG-400 have
same performance for all intents and purposes. Solid wire is the only real difference.

RG-400 is what I used and try and minimize cable length, but 7 feet is not going to
ruin your transponders operations. 7 ft vs 6 ft adds 0.09 dB loss. Negligible. These
are all 50 ohm RF coaxial cables. They all "work" and it is unlikely it you would notice
differences in service. With that said see my first comment.

RG-58 is what was used before and performance and materials are less than RG-142
and RG-400. RG-58 has more loss. I would not use it for installation. However there
are many planes radios and transponders working fine with RG-58 today.
Raleigh, NC Area
RV-4, RV-7, ATP, CFII, MEI, 737/757/767

Last edited by gmcjetpilot : 10-28-2018 at 12:52 PM.
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 06:34 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.