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Hello Stephen
Wonderful things do sometimes happen. I
will try the impossible, and receive your VLF transmission here in Biggleswade.
- Good luck with it.
73 Dennis M0JXM
----- Original Message -----
Sent: Tuesday, November 15, 2011 8:09
PM
Subject: VLF: 8970 Hz transmissions, soon
again here
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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