REFLECTOR: Poor Comm Performance

[Sid Knox]

----- Original Message ----- 
From: "Kirk Aragon" <aragon_kirk at hotmail.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Tuesday, September 04, 2007 12:11 PM
Subject: Re: REFLECTOR: Poor Comm Performance




John,

I had the local radio repair shop check my radio stack (SWR meter test). 
They verified that both radios are working well. They did not have an issue 
with the coax cable used so I assumed that the type is correct (but you know 
what they say about assumptions, so I'll check for RG58). They also verified 
the crimps and connectors between the radio and the COM1 antenna. They were 
not able to verify this to the COM2 antenna (in the winglet). I'm assuming 
that the COM2 antenna has become disconnected at its weakest point (the 
sheath connection).

The local radio shop would be very happy to install an external antenna for 
COM2.  :-)

Thanks

Kirk

Date: Tue, 4 Sep 2007 11:36:57 -0500
From: johnt at comp-sol.com
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Poor Comm Performance









A couple comments...

What type of coax cable was used in your airplane?

Have you double checked all of the crimps/connectors?

Suggest you get an SWR meter test (maybe a local HAM, or the local EAA 
chapter knows someone) - on your existing antennas.

Are you sure it's the antennas - have you checked the radios...?  i.e. check 
the antenna with a handheld radio connected - after the SWR test....



From: reflector-bounces at tvbf.org on behalf of Kirk Aragon
Sent: Tue 9/4/2007 11:17 AM
To: reflector at tvbf.org
Subject: REFLECTOR: Poor Comm Performance



Hi all,

Since I purchased my Velocity, I've noticed very poor COM performance on 
both COMs. Range is not much more than 3 miles with COM1 and COM2 appears 
not to work at all. Because of this, I will not fly into Class A, B, C, or D 
airspace. This limits my travel options quite a bit and I was looking for 
advice on new antenna placement.

Since I'm assuming that my radio cable has disconnected from COM2 and I'm 
already using an external antenna for COM1, I've looked at several internal 
and external antenna options, but consistently note that ground plane is 
needed for the correct functioning of the external antenna. I can't find a 
single flat place that is 42" or greater and attribute the poor performance 
of COM1 to this fact. I also don't like the idea of an external antenna from 
an aesthetic point of view and would like the aircraft to be as "clean" as 
possible.

Recently, I came across Advance Aircraft Electronics 
(http://www.advancedaircraft.com/index.htm) and their linear antennas. It 
seems like these would work great in the winglets. However, since I did not 
build my aircraft and the winglets are already "glassed," would this be a 
good candidate area for installation? If so, can anyone estimate the amount 
of work this might entail (no repairman certificate = lots of $$$)? Is there 
a better location for installation?

I haven't used my Terra stack in IMC, but intend to get my instrument rating 
in the next year. The poor COM performance has me worried that my antenna 
installations will not be up to the task. I would definitely appreciate 
guidance.

Thank you

Kirk Aragon
N360TV (SE/RG)







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