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  #1  
Old 01-29-2019, 11:20 AM
Stockmanreef Stockmanreef is offline
 
Join Date: Nov 2012
Location: Midland, mi
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Default Antenna wire: amount

I assume that I should probably use the following cable wire for the comm and gps:

RG-400 M17/128 Rf Double Shield Coaxial Cable

How much would I need? A rough guess. 30 ft?

thanks
ken
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  #2  
Old 01-29-2019, 11:21 AM
bkervaski's Avatar
bkervaski bkervaski is offline
 
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Location: Birmingham, Alabama
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Get double plus 25% of what you need .. so when you cut it 1 inch too short you don't have to pay shipping again

Seriously ... don't forget enough to learn how to install the connectors, order extra connectors to train with, and leave enough for service loops in case you have to re-terminate later to troubleshoot.
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Last edited by bkervaski : 01-29-2019 at 11:28 AM.
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  #3  
Old 01-29-2019, 11:29 AM
control control is offline
 
Join Date: Feb 2006
Location: Stockholm, Sweden
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Depends on what you will use.

At least one com-com antenna under the seats
A transponder antenna in the back
Probably to an IFR GPS antenna on top behind the canopy
a com2?
will you make you own EFIS GPS antenna or buy an antenna with cable


My com antenna cable, IFR GPS Antenna and Transponder antenna cables are probably closer to 50-60 ft in total
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  #4  
Old 01-29-2019, 11:40 AM
Bavafa Bavafa is online now
 
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Location: Sacramento, CA
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Just to add to what Control has suggested, it also depends on where those antenna will be located.
As a reference, my GPS (two of them) antennas are in the wingtip as well as my VOR. The TXPDR and remote radio are behind the baggage compartment and I believe I bought 100' and used majority of it.
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  #5  
Old 01-29-2019, 12:23 PM
Stockmanreef Stockmanreef is offline
 
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Location: Midland, mi
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well, the transponder antenna cable comes with the empennage kit. It is interesting that that does come with the kit while the comms do not. I have a gtx 45, which has one antenna for both the ADS-B and the transponder. ALso, I think that I have a gps antenna for the EFIS that came with the panel. I wil have to verify.

The VOR antenna will come with a wire. I plan to go with the whiskers in the vertical stabilizer and I can get antenna with the cable.

So it is just the 2 comms under the seat and the GPS on the top of the empennage. Steinair suggested 60'. I was thinking that was overkill.
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  #6  
Old 01-29-2019, 02:53 PM
Stockmanreef Stockmanreef is offline
 
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Does a VOR antenna use coax cable? like:

RAMI AV-532L VOR ANTENNA WITH CABLE

the picture on ACS with cable shows wire ends that don't look like cable terminal.
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  #7  
Old 01-29-2019, 03:30 PM
mturnerb mturnerb is offline
 
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Location: Ponte Vedra, FL
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I bought 60' and used most of it. My VOR antenna (Archer in wingtip) did not come with wire.
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  #8  
Old 01-30-2019, 06:58 AM
219PB 219PB is online now
 
Join Date: Aug 2014
Location: Victoria, Tx
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Unless you find a great deal from a source that you will not be using in the future, I recommend that you measure and order just what you think you will need.

I ordered most of mine from Aircraft Spruce and Stein Air. There are numerous opportunities to order more wire when you order other items and then save shipping costs. I think that I have placed more orders with Aircraft Spruce than any other vendor in my life. I use the wishlist on their site. Just keep adding items to it until I can justify the shipping costs.

This wire costs $3/foot. I know that you can use cheaper styles of wire for certain uses but I just used the 400 for all.
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  #9  
Old 03-05-2019, 02:44 PM
Stockmanreef Stockmanreef is offline
 
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Location: Midland, mi
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should I add a doubler plate for the transponder antenna?

did anyone find that the coax cable that Van's supplied with the empennage kit to be too short by a foot or so? It is supposed to run from the back of the tail cone to the panel. It does, but not any extra. Turns out it is not long enough to reach my GTX 45R. If I put it behind the center stack it would have been enough, but I have something else there. So it looks like i will be rerouting to the antenna to the port under the baggage area.

Not a huge deal. Just means that I have to climb into the tail cone and clip all the cable ties and then run the cable where I want it. sort of a PITA, but low on the list of annoying things thus far in the build.
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  #10  
Old 03-05-2019, 02:56 PM
Nova RV Nova RV is offline
 
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Location: Leesburg, VA
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Make sure you want the transponder antenna there for sure before you do that to save a few dollars on coax. The rear mount already has the doubler in place and it's always best to keep the distance between all of your antennas as much as reasonably possible. I also didn't like that there was an antenna pretty much underneath the passenger seat connected to a high output device that is transmitting constantly compared to a regular comm. the nice feature of the GTX 45R is it only needs the one antenna so you don't have to use that hole on the passenger side.
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