Hi Paul,
Very nice! I suggest to choose a frequency of 137.5 kHz +- 50 Hz,
because this is the range for OPDS receiving stations using DF6NMs
tool/decoder. There we can directly use the exportet txt files that are
generated for OPDS anyway, to look for your signal.
For weak carriers or QRSS i recommend 136.172 kHz +- 3 Hz.
You will find some active LF grabbers showing this range in 22 mHz (ish)
and 10s scroll rate.
73, Stefan
Am 07.03.2016 21:35, schrieb Paul Nicholson:
Today saw another 200m of wire added to the long wire antenna.
Its impedance dips to a minimum of 70 ohms at about 170kHz
corresponding to a free-space quarter wavelength of 440m which
is somewhat less than my estimated total length of wire.
100uH in series brings it into tune at about 135kHz and presents
an impedance of 50 ohms and the tuning is quite broad, I don't
think I need a variable inductance.
Can anyone advise a good frequency on which to test which
won't get in anyone's way? I expect to be using symbols
one second or longer.
--
Paul Nicholson
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