Read the article on Dopplergrams by G3PLX in RadCom three or four years ago
...
There is likely to be several Hz of Doppler shift on that frequency at night
time.
Guess who forgot that simple fact last night !
Andy G4JNT
-----Original Message-----
From: James Moritz [mailto:[email protected]]
Sent: 2001-11-26 12:23
To: [email protected]
Subject: LF: 73k Beacon - SM6LKM on 80m
Dear LF Group,
Transmitted on 72.4018kHz from about 2315 until 0505 last
night, with QRSS120.
I also saw SM6LKM's 80m signals, about 5-6 Hz above the
nominal frequency,
between about 2130 and 2300. Copy was "M" to "O" (see
attachment) - I found
better results were obtained using somewhat wider bandwidth
spectrogram
settings than usual - Using Spectrum Lab, about 0.3Hz
resolution, and Argo
on 3s dots, slow speed, seemed to be optimum. If higher
resolution was
used, the lines were quite fuzzy, whether due to propagation
or TX I don't
know. RX was RA1792, and the antenna was my LF TX wire. This
could be an
interesting way of monitoring HF propagation; It hardly takes up any
bandwidth, and does not require an elaborate TX or antenna to
get a few mW ERP.
Cheers, Jim Moritz
73 de M0BMU
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