Hi All,
I used Argo last night to monitor the Amrad Beacon frequency at 136.750 kHz
and found a signal precisely on frequency to within 0.01 Hz. I used the
highest resolution of 120 sec dots, which means that one cannot see the QRSS
coding, which is probably 3 sec dots, but the signal could probably not be
seen at all if I had set Argo to that dot length. I used the Loran lines to
calibrate Argo.
To see the best image click on www.g4cnn.f2s.com/amradbeacon.jpg. The signal
is about 0.01 Hz low in this picture, but when I recalibrated Argo this
morning, I found the nearest Loran line at 136751.5669 also appeared 0.01 Hz
low, so this is just a calibration error (still learning).
The signal was visible from about 22.00 last night (010205) until 06.00 this
morning when it died out.
I saw no clear "Dawn effect" on the QRN in these images, but the QRN is low
throughout, which might be a result of using this resolution, or perhaps the
different frequency.
In order to measure to 0.01 Hz accurately, I had to import the images into
Paint Shop Pro and use the vernier to measure the difference in position of
two consecutive 1 Hz marks and the line. The lack of finer vertical scaling
in Argo is the one minor deficiency in this otherwise excellent package.
Thanks Alberto.
73, John, G4CNN
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