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Ok Marcus
Yes its probably the sdr playing
tricks .. shortly after , I found
reception under 500 was 'odd , so re
installed the software , I did check with the twent
web sdr , nothing was showing , so its
possibly a ghost from hf
Its one of the rtl dongels , wired direct sample ,
looking at the Tx Ae via the 477 atu ,
works quite well (most of the time)
especially as there is a MW Tx not
too far away
There was a wide data signal covering
the lower end 502/504 for some time in
the past ... this was quite a fast transition ,
that 'gap' took only a few seconds to
pass right to left , not fading ? , some
characteristic of the tx ?
73 -G..
Sent: Thursday, April 25, 2013 10:11 PM
Subject: Re: LF: whats just below 472 ?
Hi Graham,
what's the timescale on your SDR# screen? To my
eyes the selective fading looks way too fast for MF. Might be some
samplerate alias from an HF transmission. Are you using RTL in direct sampling
mode, bypassing the tuner - any prefilters?
Best 73,
Markus (DF6NM)
Sent: Thursday, April 25, 2013 5:02 PM
Subject: LF: whats just below 472 ?
Some sort of wide band data system
? and short bursts above the band
or is this the sdr playing tricks
G... ?
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