Hi Stefan, Bob,
LF,
brought the antenna back up for the night,
hope it will stay put.
I'm sorry about the mediocre sensitivity of
the grabber in this location. The noise level seems to be constant
irrespective of day or night, which is a sure indication that I'm
dominated by local noise rather than band noise. The spectrum is full of 50 Hz
spaced lines, with what looks like white noise inbetween.
The hardware configuration is similar
to the one which had worked best during my springtime visit in 4X: a
passive wire antenna with separate earth lead, a small isolating ferrite
tranformer, FiFi-SDR receiver with a simple input
filter, netbook and 19V power supply grounded
to protective earth. But here the antenna is lower (no trees on the
island), ground connection is worse (ashes and rock), and a noisy
environment. Not sure about the degree of directivity
introduced by the Famara ridge, but as it is going up by 400 to
600 m ASL it may well have some effect.
If I really wanted I could probably
go out into the desert, take along a couple of
broomsticks to raise a wire, and record on battery for an hour or so. But
then there would be no internet connection, and it could only be a single
experiment of limited duration.
Bob: if you want to try despite the RX
deficits mentioned above, I would recommend to use QRSS-60 or DFCW-90 in
the TA slot (137775 - 137781), as it will show traces at weaker
levels than WSPR-15 would decode.
Best 73,
Markus (EA8/DF6NM)
Sent: Monday, November 18, 2013
11:59 AM
Subject: Re: LF:
Lanzarote
Hi Markus,
Thanks for the service.
Last night i tried again but there is no chance. It appears that the DCF39
SNR is much lower than expected over that distance. Are you sure this is due
to the hill on the path to DCF?
Do you think you can see the band noise /
have the maximum sensitivity? I assume there could be at least 10 dB, rather
20 dB to gain. How does the diurnal wideband spectrum look there? Periodic
QRM?
And do you use the same equipment as in India last year?
73,
Stefan/DK7FC
Am 18.11.2013 10:39, schrieb Markus Vester:
Just went out and noticed that the wind had taken
down the antenna wire - hence the weak signals.
73, Markus
Sent: Monday, November 18, 2013
10:12 AM
Subject: Re: LF:
Lanzarote
No signals were captured here in the Eu / TA /
WSPR-15 slots last night.
Best 73,
Markus (EA8/DF6NM)
