lml@lancaironline.net Mailing List Archive

Your VSWR sounds ok. Where was it measured ? At the radio output or the antenna input ?

Could be a number of causes. Two main areas of investigation ;

1) check the radiated signal with a field strength meter and compare to another aircraft.

2) check your audio signal and make sure you have full modulation of the RF signal.

Wolfgang

From:	TOM GARDINER <n20087@yahoo.com>
Sender:	<marv@lancaironline.net>
Subject:	Antenna type and placement
Date:	Wed, 23 Feb 2011 09:09:33 -0500
To:	lml@lancaironline.net

Folks

I am experiencing a dreadful time getting my COM radios to perform to their full (or even half) potential in my LNC2. I have two Bob Archer's mounted in the tailcone and in the proper orientation with a VSWR of around 1.5 with RG 400 cable. The antennas are fed by two Garmin 430s with a measured output of 8 watts each. The thing is that ATC and my flying friends report a consistently weak signal and the same applies on reception on my end. My airplane has the carbon tail and I built the seat bench using carbon on foam (bad idea in hindsight). I have tried another type of antenna that is a dipole with a balun mounted in the center of the baggage section in a vertical orientation but with little or no improvement in results.

I am beginning to suspect the Lancair supplied Gray epoxy primer which I understand contains aluminum oxide in the base

I am now considering mounting an external antenna but thought I would ask if anybody had experienced similar issues and subsequently corrected them. Any help/advice would be very much appreciated

Thanks

Tom

LNC2

24 hrs