Hello Horst, VLF,
Am 11.05.2010 10:45, schrieb Horst Stöcker:
TV
Transformer, interesting. I think it should work well on lower
distance. QRP on 9kHz, hi. I also had this idea after my first tests on
9kHz. I wanted to test it but my few TV transformers are DST and I
think I will need a flyback. The flybacks are common in the first
generations of tv sets up to the seventies but hard to get nowadays.
Look here: http://www.oppermann-electronic.de/html/teslatechnik.html
(TESLA 82)
I am
not sure if the hoizontal antenna is the best solution. As we know in
theory there are more ground losses. But if this will be of any
significant influence at this low frequencies?
It is just a simple and "inofficial" test. But the transformer already
works. The antenna is very bad! Just 8...10m and 3m up. It is mounted
in a tree and there are houses around it... A first test was negative
yesterday. It seems i've been to optimistic ;-) But anyway.
Those TV transformers are only suitable for local near field tests. I
assume you will not radiate something that can be detected in the far
field, as long as you stay below QRSS-600000000 ;-) My goal is to
produce a signal in 1,1km. Then i can check if an improvement of the
grabber is really an improvement. You know, sometimes you think you
have successfully reduced the noise but in fact you have also reduced
the wanted signal, so nothing is won. Increasing the SNR is the goal
and this is better to check if there is a wanted signal that is exactly
on the frequency and in usual modes...
I am
looking foward to your tests again.
As soon as possible!
BTW I
am waiting for more motivating weather conditions. I collected a few
hundred meters of isolated military wire. After confectioning it I will
have material for an earthbase of about 800 to 1000 m. This will be
tested as soon as possible.
Earthbase? Do you want to try such a ground electrode antenna? This
would be very interesting!
73, Stefan
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