Stephan
This latest setup was put together for the SAQ test in December. I've used various loop
antenna/receiver setups in the past and have had reasonable reception of SAQ however no reception of
Alpha. This was the first time for the e probe / Perseus setup and it worked very well...after the e
probe was put on battery power and transformer decoupled. Most of the time there were no 60 Hz
products in the frequency range of interest (10 kHz - 80 kHz) and the noise floor was very clean
sounding. No filtering was used between the e probe and Perseus.
There appeared to be a noticeable quiet spot in the waterfall between ~ 8 and 9 kHz. I didn't
investigate if this was an anomoly in the system or if there happens to be a quiet spot at that
frequency. As time permits I'll look into that further.
Jay
----- Original Message -----
From: "Stefan Schäfer" <[email protected]>
To: <[email protected]>
Sent: Thursday, February 25, 2010 10:39 AM
Subject: LF: AW: Re: VLF test signals?
Tnx Jay, Uwe, Jean-Louis, group,
Jay, that sounds to be a good RX concept. You do not have a band pass filter in the preamp? What
about the 50Hz or 60Hz ;-) lines and the levels they generate at your RX imput? No problem? Well
decoupled by the transformer? Sounds easy and at once to be built...
On that VLF SDR, the russian transmitter at 11,904kHz is really weak to copy :-(
73, Stefan
________________________________
Von: [email protected] im Auftrag von [email protected]
Gesendet: Do 25.02.2010 13:37
An: [email protected]
Betreff: LF: Re: VLF test signals?
Stephan
Which commercial VLF transmitters can actually be received in the 10kHz range?
The Alpha stations on 11.9, 12.7 and 14.9 kHz are visible (cw speed waterfall)
and audible here a
good percentage of the time. Receiving setup is 1 meter e probe (J310 version
of the Amrad e probe,
battery powered and transformer decoupled) to a Perseus SDR receiver.
Jay W1VD WD2XNS WE2XGR/2
----- Original Message -----
From: "Stefan Schäfer" <[email protected]>
To: <[email protected]>
Sent: Thursday, February 25, 2010 6:58 AM
Subject: LF: VLF test signals?
Which commercial VLF transmitters can actually be received in the 10kHz range?
There is much listed
in the web but in times where these transmitters are shut down all this may be
already old stuff.
Who is receiving in this frequency region and can tell us a frequency and the
SNR he is achieving?
There are so many OMs who watch the VLF sector and have nothing done with LF
and this group. Perhaps
it it an idea to activate/motivate them for some tests, to increase the RXers
density.
Maybe it is good to compare some RX rprts in that region. But i will rather be
active at the
transmitters front now ;-)
Stefan/DK7FC
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