VLF,
A few days ago, Andrey / RD4HA from the RC4HAA club station has
installed a GPS module for getting a better accuracy of a 47 uHz
spectrogram. You can clearly see the improvement of the stability of the
Alpha trace at 11904.7619 Hz (the daily phase jump in the Alpha trace is
normal), see attachment.
Last night i gave it a first try and sent a pure carrier from about
19...9 UTC on 8270.0050 Hz. The antenna current was a bit reduced, just
about 650 mA but that's still a lot.
Now there is a short 'dit' on the right frequency. Just a few pixels in
the spectrogram scrolling at 100 min / pixel. It is on the right
frequency! Still not quite convincing, right? ;-)
But tonite i will run another transmission, starting 17...5 UTC. With a
second trace on the same frequency, to the right time, it will look a
bit more convincing :-)
73, Stefan
RC4HAA_VLF.jpg
Description: JPEG image
|
