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Date: Fri, 10 Jan 2014 22:19:47 +0100
From: wolf_dl4yhf <dl4yhf@freenet.de>
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Subject: Re: LF: MF: 'BIA' modulation sideband at 472.0 kHz ?
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Hi Roelof,

Many thanks for the info. As soon as wx permits, I will take a Perseus 
to my RX site and see if the signal is still there.
At the moment, I have the IC 706 running with preamp turned on, which 
isn't always a good idea (IM-wise) ... but it helps during daylight 
conditions.

Have a nice weekend,
   Wolf .

Am 10.01.2014 21:44, schrieb Roelof Bakker:
> 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
>
>
>