James Moritz wrote:
Dear Valerio, LF Group,
I made 3 recordings of IK5ZPV's "Wolf" signals on 137.5kHz last
night; one made between 2000 and 2025utc produced no decoded
results, however the other 2, from between 2100 and 2200, both
decoded without problems after the 2nd and 3rd data frames
respectively. The message was "TST IK5ZPV 10W", and the
indicated frequency offset was between +0.15 and +0.4Hz. We are
now reaching what must be QRP by anyone's standards, and there
still seems to be some margin on signal strength. Conditions
seemed to be quite noisy last night, so lower powers should be
possible.
Valerio - I would be interested to know some details of TX
equipment and antenna you are using for these tests - seems to be
working well , whatever it is!
Cheers, Jim Moritz
73 de M0BMU
Dear Jim and others,
the setup i'm using to test Wolf is almost the same i use since 1999.I
made only some improvements to ground adding some hundreds meter of wire
but with small change in inpedance.
The antenna is the same 100mtX15mt L, and the TX is G3YXM design.
The wolf stream is sinchronized with the RF carrier and BPSK modulation
is obtained with a couple of x-or gates.
I wish to continue with wolf transmissions in the next days. I will use
different power level, starting from 20:00 UTC.
Many thanks to all for the reports,
best wishes, '73
Valerio
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