OK..
OK. dreamers, the TX is on the air since 1309UTC.
QRG:
8270.000Hz.
WX: continuous rain but not so strong.
when ever the order
comes, I can switch to Op-4H.
GL
Uwe/dj8wx
Von:
[email protected]Gesendet: 03.01.2014 13:21
An:
[email protected]Kopie:
[email protected]Betreff:
Fw: VLF: 8.275 kHz
Paul Nicholson put
forth the important argument that we'd better stay away from 8280 because
it's a multiple of 60 Hz. Mains harmonics tend to drift a bit with the
line frequeny so further away is better.
Thus I retract my
preposition, and suggest instead to stay with the original 8270
Hz.
Uwe, go
ahead!
Best 73,
Markus
PS Direct harmonics
from 16.67 Hz are relatively weak here, even though the railway is only 400
m away. It looks more like carriers from switchmode power
conversion units (eg near 8 kHz), accompanied by the telltale
33 Hz spaced sidebands. Unfortunately these frequencies are not easily
predictable.
Sent: Friday, January 03, 2014 12:56 PM
Subject: Re: VLF: 8.275 kHz
8970 is well placed with respect to harmonics of
both
50 and 60Hz.
8270/8275 not so good in a 60Hz region.
8124 to
8126 would be a good range, considering
harmonics of 16.67Hz, 50Hz, and
60Hz.
Let me know what is decided, I will switch my
spectrogram
over to the new band.
--
Paul
Nicholson
--
