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Hi Doug,
you could probably have heard the Omega's
without the amplifier. One of the fascinating radio experiences
was when Geri DK8KW and I heard crisp 11.9 kHz dashes from Alpha
Krasnodar on a headphone connected to the LF antenna,
using only a line-output transformer tuned to resonance, and nothing else
inbetween. This was the same little backyard Marconi I still use
today (measured (in-)efficiency about -70 dB at 9 kHz), and an average
cheap "walkman" type headset.
Well that was a dozen years ago. Guess I'll
have to repeat the experiment to see if I can still do it now, at age
53 ;-) Ah, this must be the reason why we men need higher antennas as
we grow old ;-)
Good luck for your VLF work!
Best wishes,
Markus (DF6NM)
Sent: Saturday, January 28, 2012 4:18
PM
Subject: Re: LF: VLF this morning in
TN
Thank you Wolf. Those are nice captures for
comparison. I see you have no trouble receiving NAA, but the other two
continental U.S. stations are much weaker.
The alpha stations are difficult for me to copy
with the sound card, but I can often hear them at night using my R75 and
upconverter with the 250Hz CW filter.
The OMEGA system, when it was still active, put out
some very strong signals here. All one really needed to hear those was an audio
amp, short whip antenna, and headphones.....and sufficiently sensitive hearing.
I find that when I listen to some of the live
streaming "natural radio" receivers in Europe, I can hear the Alphas in my right
ear, but not my left ear. Guess my high frequency hearing is starting to
go.
Doug - KB4OER
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