Hello Joe,
Good propagation last night and it was no problem to copy your CW
signal by ear. See attachment.
This is an interesting picture as it clearly shows the keying
sidebands of your signal. The signal is 9 Hz wide and the optimum
filter bandwidth is 10 Hz.
However, just like an AM signal, the same information is contained
in either sideband, so one sideband can be omitted. The signal can
indeed be copied using a bandwidth of 5 Hz, which improves the
signal to noise ratio by 3 dB compared to a 10 Hz filter bandwidth.
Yet, it can also be marginally copied in a 500 Hz bandwidth.
The horizontal band at 07:04 UTC is caused by severe static hail.
Even reception of the Dutch NAVTEX station on 518 kHz was severely
corrupted.
Best regards,
Roelof
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From: Roelof Bakker, PAoRDT
Location: Middelburg, Zealand SW Netherlands, 51 30 02 N, 03 36 02 E
Locator: JO11tm
Receiver hardware: PERSEUS
Receiver software: Linrad
Aerial: pa0rdt-mini-whip, 5 metre up in a hawthorn tree.
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File: VO1NA20160225.gif
Date: 25 Feb 2016, 9:56
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