Hello Roger,
Do you have an estimate about your transmitter's frequency stability
(mHz per minute or similar) ?
This would help to guesstimate a half-way matched FFT bin width, or
-if you prefer- QRSS speed index. Anyway, even for listeners/viewers
in your neighbourhood, I'd suggest to use a setting for QRSS 120,
or, if soft/hardware permits, even slower mode to sequeeze the last
fraction of a dB out of the equivalent receiver bandwidth.
Unfortunately no good site for RX reception here, otherwise I'd like
to test a new GPS-stabilized receiver. Maybe in a few weeks, using a
remote VLF site with wideband FM link.
Good luck with the test,
73, Wolf DL4YHF .
Am 12.12.2010 23:51, schrieb Roger Lapthorn:
This Wednesday, Dec 15th, I will run tests on 8.7608kHz
with very long continuous TX periods of several hours
interspersed with gaps of 0.5 to 1 hour. Transmissions will start
at 0900GMT and finish at 2300GMT. I will reveal the TX pattern
after the test so the test is done "blind".
I'd be most grateful if suitably equipped stations could look for
any possible signs of the signal, even though I shall only be
using the 20m spaced earth electrodes and 5W as used for my local
earthmode tests. Those able to screw the bandwidths right down may
just be able to detect something, although I think it is unlikely
at any great distance.
15.12.10
0900-2300z
8.7608kHz
Carrier "on" periods of 30mins or more
Good luck to anyone having a go.
73s
Roger G3XBM
--
g3xbm-qrp.blogspot.com/
www.g3xbm.co.uk
www.youtube.com/user/g3xbm
G3XBM GQRP 1678 ISWL G11088
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