Subject: LF: 8270Hz
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
--
