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  #1  
Old 07-18-2016, 08:25 AM
gfb gfb is offline
 
Join Date: Jul 2014
Location: Madison, WI
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Default Antenna selection?

A quick search shows many antenna threads but not one that quite touches on selection. I have no opinions on antenna models or brands, and honestly it seems that antenna manufacturers seem to have many model numbers for antennas that look exactly the same to me

I randomly selected some options from ACS, please let me know your thoughts or other recommendations:

GDL UAT Antenna (bottom) RAMI AV-22 (ACS 65)
GTX Transponder Antenna (bottom) RAMI AV-22 (ACS 65)
GTR Com Antenna (bottom) RAMI AV-17 (ACS 179)
GTN Com Antenna (top) RAMI AV-10 (ACS 168)
GTN Nav Antenna (right) Archer SA-001 (ACS 100)
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  #2  
Old 07-18-2016, 08:29 AM
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Dbro172 Dbro172 is offline
 
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Archer is good for your Nav. The rest you can get here: http://www.deltapopaviation.com/Home.html
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  #3  
Old 07-18-2016, 08:38 AM
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I noticed the Delta Pop antennas in another thread. Are people flying with them and happy? I don't know enough about antennas to be able to compare them to the certified types.
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  #4  
Old 07-18-2016, 08:45 AM
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bret bret is offline
 
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I went with DP also, two blade, two bent whip, done, easy, nice quality.
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  #5  
Old 07-18-2016, 08:56 AM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by gfb View Post
I noticed the Delta Pop antennas in another thread. Are people flying with them and happy? I don't know enough about antennas to be able to compare them to the certified types.
Exceedingly happy, on performance, service, and price!
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  #6  
Old 07-18-2016, 08:59 AM
jchang10 jchang10 is offline
 
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I just got an antenna from DP as well for a top mounted straight COM antenna. After drilling the holes, i realized that you really really want the company to be around for a long long time making the same antenna for when you need to replace it and not have to drill new holes. Thus, yes, go with DP.
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  #7  
Old 07-18-2016, 09:42 AM
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Quote:
Originally Posted by jchang10 View Post
I just got an antenna from DP as well for a top mounted straight COM antenna. After drilling the holes, i realized that you really really want the company to be around for a long long time making the same antenna for when you need to replace it and not have to drill new holes. Thus, yes, go with DP.
I also didn't like the idea of a two-hole com type antenna with a unique mounting pattern.

However, the DP transponder and UAT antennae have a standard mount pattern that is identical to the Comant CI-105, Bendix KA-61 and other certified small blade mounts.
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  #8  
Old 07-18-2016, 11:06 AM
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flightlogic flightlogic is offline
 
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Default dipole stub for UAT

I do notice that you can now buy a specific UAT cut antenna. It looks just like the transponder stainless stub, but is cut shorter than 1090.... for the 978 UAT frequency. I just put on on the bottom of the RV9A for Navworx. It is working fine and was under $25.
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  #9  
Old 07-18-2016, 11:39 AM
rv7charlie rv7charlie is offline
 
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It's unlikely that you can tell the difference in performance among any of the externally mounted antennas, without megabuck instruments and a test range. Location (to a minor degree) and installation technique make far more difference than antenna selection.

So...

A straight, round section has the highest drag.

A swept round section can get fairly close to a streamline shape in drag.

A streamline section has lowest drag.

I'd buy the cheapest antenna that meets your mounting/appearance requirements. (Unless I find a 'deal' on a used one, I'll be making mine from stainless welding rod & a BNC bulkhead connector.)

Charlie

edit: Just saw that you had multiple antenna types listed. For a transponder/UAT that's likely to be on the belly (in already nasty-turbulent air) and only a few inches long, there's no contest for me. Cheapest every time.

Last edited by rv7charlie : 07-18-2016 at 11:44 AM.
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  #10  
Old 07-18-2016, 01:12 PM
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IowaRV9Dreamer IowaRV9Dreamer is offline
 
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Quote:
Originally Posted by flightlogic View Post
for the 978 UAT frequency. I just put on on the bottom of the RV9A for Navworx. It is working fine and was under $25.
Where can I buy this antenna?
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