Hello Markus, Stefan, LF!
My receiver is on my workplace, therefore at night I can't supervise its work
directly. On screenshots I have noticed that with approximately 17:30 till
02:55 UTC quality of reception strongly worsens. At first I thought that it,
possibly joins any powerful device and creates a local QRN. To learn that this
such, I have added in sheduled actions wave.record. In the morning, having come
for work, I have analysed this record. It has appeared that the entrance signal
from the aerial increases at night almost in 10 times. The microphonic
amplifier of my sound card strongly there were nonlinear distortions. I have
switched off the microphonic amplifier and have reduced factor of strengthening
of the receiver (receiver has no AGC); probably, it will allow to have pure
reception at night time.
So a continuous line on 136172 Hz is result of nonlinear distortions in the
microphonic amplifier.
PS On screenshots each division of a scale of amplitudes is 10 dB
Vy 73 de rn3aus/Alex
13 сентября 2011, 15:31 от Markus Vester <[email protected]>:
Thanks a lot Alex for this! I'm glad that both our signals made it across,
in spite of unfavourable geomagnetic conditions.
At the beginning of the screenshot, there was a continuous line very close
to Stefan's frequency 136172.00 Hz. This does not fit the 6.25 Hz raster of
Loran/Chayka GRI 8000. Do you perhaps have another explanation for it?
Best 73,
Markus (DF6NM)
-----Ursprüngliche Mitteilung-----
Von: Alex K <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Mo, 12 Sept 2011 5:58 pm
Betreff: LF: DK7FC, DF6NM nr Moscow
Hello LF!
Rcvd 10 Sept 2011 at 03 UTC
73 de RN3AUS
12 сентября 2011, 22:57 от Stefan Schäfer
<[email protected]>:
>
> Am 12.09.2011 19:42, schrieb Stefan Schäfer:
> >
> > PS: Will try again TXing to the far west later at 18:30 UTC.
> >
>
> The SMPS has a fault again :-/ I am to close to the power limit and a
> SMPS as a load of a SMPS always keeps the supplying SMPS on its current
> limiting, which fails after some time...
>
> 73, Stefan
>
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