Stefan
I look forward to your tests, please try and give me a warning even
for the spontaneous tests so I can leave my Grabber,
http://g3zjo.bplaced.net , on overnight if needed. Also, due to lack
of sunshine on the solar panel here, I have been running a dirty
earth supply to charge the battery, during tests I can remove this
for cleaner signals.
73 Eddie G3ZJO
On 15/11/2011 20:09, Stefan Schäfer wrote:
VLF,
Am 15.11.2011 17:03, schrieb DENNIS EASTERLING:
[...] I also have a mini-whip, but this
has
been extended for
VLF purposes. [...]
...which is good since soon there will be some activity again on
8970
Hz. If you like you can join in to the group of successful
listeners on
the 33 km band.
Yesterday i carried my TX coil to the fixed antenna here. Also the
PA
and variometer part of course. I do inted to use the fixed
antenna.
I did some calculations about the radiation resistance and losses
and
power at maximum voltage (50 kV rms on the wire) and found that
the ERP
will be about 10 dB higher than expected, i.e. i could radiate
something in the range of many 100 uW up to 1 mW or theoretically
up to
2 mW. We will see and measure.
Paul Nicholsen reported about a very senistive receiver in USA
that
allows long time integration, i.e. not producing a spectrogram but
integrating a given TX time into a single bin, like Paul usually
does.
Here on the fixed antenna i could do night transmissions. 500W TX
power
key down for 24h is no problem (as long as there is no rain).
So i am optimistic and looking forward to some new work on the
dreamers
band!
Also i would be interested if there is (still) some interest in
VLF in
this group. For Paul, a endless straight "carrier" would be the
optimium while a radio amateur may like to have some true ID and
maybe
a message to be read and displayed. What about the grabber runners
and
new prepared VLF receiving stations?
Probably i will start next week but may do some spontaneous tests
before...
73, Stefan/DK7FC
PS: I would like to see other VLF transmitting stations as well.
What
about G3XIZ, DF6NM, OE3GHB, OE5ODL, OK2BVG, DJ8WX? We all could
leave
some common traces again in the excellent dark spectrogram
backgrounds!
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