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Re: LF: DJ9!E and DF5QG CW 0n 472.5

from [Roelof Bakker] [Permanent Link][Original]
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: DJ9!E and DF5QG CW 0n 472.5
From: "Roelof Bakker" <roelof@ndb.demon.nl>
Date: Mon, 29 Oct 2012 15:51:08 +0100
In-reply-to: <508DA2F3.20400@freenet.de>
References: <508D47B2.8060209@iup.uni-heidelberg.de> <46A9A1D9FC954A658216B197782524BF@White> <891CD59233F844C283BAC09A2AAA04BA@White> <508D6A9D.4020600@iup.uni-heidelberg.de> <508D6C1A.7050607@iup.uni-heidelberg.de> <508D8084.6020501@freenet.de> <508D8295.8010604@broadpark.no> <508D84F0.1000706@freenet.de> <508D87C4.9030808@broadpark.no> <1351458186.87962.YahooMailNeo@web133201.mail.ir2.yahoo.com> <508DA2F3.20400@freenet.de>
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Hello Wolf,

This phenomenon can be observed on many NDB's.
I don't think that a sophisticated modulator is used.
One reason for sure is selective fading.
It is not uncommon to see one sideband completely disappear whilst the other is quite strong and vice versa. 
An other possibility is the restricted bandwidth of the antenna in use.
Many installations use an automatic antenna tuner, but this can get awry in the long run by worn gearboxes etc! 
73,
Roelof, pa0rdt
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