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Re: LF: MF: 'BIA' modulation sideband at 472.0 kHz ?

from [Roelof Bakker] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: MF: 'BIA' modulation sideband at 472.0 kHz ?
From: "Roelof Bakker" <[email protected]>
Date: Fri, 10 Jan 2014 21:44:55 +0100
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Hello Wolf,

This phenomenon is quite common for NDB's from the east
But not only there.
A nice example is UK based NDB CWL on 423 kHz.
Instead of two sidebands +/- 400 Hz it transmits a sideband at + 400 and + 800 Hz. 

BIA is by far not a worst case example.
Some Russian and Ukrain NDB's have multiple sidebands and at close range can cover up to +/- 5 kHz from the carrier. 

The cause is poor modulation or a faulty transmitter as in the case of CWL.

73,
Roelof Bakker, pa0rdt
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