James Moritz pisze:
Dear Stefan, Markus, LF Group,
A screenshot of DK7FC and DF6NM received in IO91VR between 2230 and
0000utc, with 84mHz FFT resolution, and using the ferrite rod antenna.
DK7FC seems to be about 6dB stronger than DF6NM here, on average. But
not really a very good night for testing receive antennas - the QRN
level is so high that the proverbial piece of wet string would be just
as good!
Cheers, Jim Moritz
73 de M0BMU
Dear Markus, Stefan, Jim, LF
Maybe this night is not a very good one for testing different rx
antennae according to Jim observations , nevertheless, some of us
decided to do it ... :)
Enclosed, there is a SL capture from my night 'experiments' - at
first, i have used my air loop antenna ( 1 sq. meter, 11t )
About 2:25 a.m. local time I disconnected my air loop while SL was
running , then, i reconnected SDR-IQ to my ferrite-rod antenna which
was inside the room !!!
( i only managed to raise it some 40-50 cm above the floor) and to my
real amusement i could still copy Markus DF6NM, also Stefan, though i
got some constant qrm line almost
on Stefan.. 172 freq i did not play with brightness/contrast etc.. just
to see how the noise changes.
Anyway, i am very happy - it is my first positive observation of a
distant amateur signal on 136 kHz band ( if i have correct data Stefan
grid-loc is JN49IK, Markus JN59NK so this makes
800 and 640 km , respectively) using ferrite rod antenna ( described
in earlier mails). As an amplifier i have used Roelof, PA0RDT miniwhip
circuit , simply
using as a high Z-input the LC parallel network.
73, Piotr, sq7mpj
qth: Lodz /jo91rs/
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