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Dear LF,
around 137.78 kHz, UA4WPF (starting
at 01:03z) and WD2XGJ (3:58 to 6:10) were again visible with good
signals.
In addition to the MF stations reported before (sri for typo
with OK0EMW), my little 501 kHz grabber harvested a strong signal SM6BHZ, and
more traces near the bottom which looked like CW beacon signals. The signal on
501.89 kHz (best around 03:00) was presumably the transmission from GM4SLV, as
seen on John's own grabber. I could not identify the trace at 501.3, and
another one on 501.2 which shifted to 501.15 at 0:50z. All would have been "O"
in QRSS3.
Roman, yes I'm using the DE 1103 which is a nice portable SWL
receiver. I have modified the BFO to place it 7 kHz above center in the wideband
filter setting. This was originally intended for DRM reception but
that worked marginally at best. One drawback for QRSS is the mediocre stability,
with three separate oscillators mixing up and down to 55.85 MHz IF - after three
hours of not touching it (!) it seems to stay within about 10 Hz. The
1st LO PLL is also affected by close-in phase noise and hum modulation. The
wideband input is somewhat prone to overload from MF and HF signals, but works
nicely on a resonant antenna with an attenuator. When tuned to 500 kHz center,
the "local" amateur signals from DI2AG and DI2AT at the passband edge
do not desensitize the receiver.
Have a nice Easter
weekend
Markus, DF6NM
----- Original Message -----
From: "Markus
Vester" <[email protected]>
To:
<[email protected]>
Sent: Saturday, March 22, 2008 12:13 AM
Subject: LF: 500 kHz
Grabber in Nuernberg
> Good evening LF,
>
> despite a
simplistic receoiver (Degen 1103) and relatively high local noise levels, it
looks like I'm now seeing a few MF signals
> here. This evening, I could
identify DI2AT (at 20 km), OK2EMW, DI2AM, G4WGT. G3KEV was copied in CW. There
are also a couple of
> unid traces on 501.97 and 501.31.
>
>
To share the fun, I have lashed up a temporary screen grabber for 500 to 505.5
kHz:
> http://freenet-homepage.de/df6nm/Grabber/500kHz.htm>
> Have a good time -
>
> Markus, DF6NM
in JN59NK
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