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Thanks to 'all'
This is the main
point of 'post'
Due to ==Ae bandwidth and perhaps alignment with other band’s==, I would suggest the original WSPR 502.4K is replaced with the lower frequency of
495.9K , thus restoring
the System’s coverage and facilitating changes of mode etc within a narrow bandwidth
Im not convinced on
the separation of the wspr 'band's in band'
exists purely to prevent interference, as
once the station separation exceeds round 75
miles the ground signal has substantially
diminished , moreover , with a reasonable receiver
and soundcard or direct conversion, the dynamic range is
quite sufficient to enable adjacent decode's
?
As a transmitting
station , I find I am unable to qsy from the top
to the bottom of the band without incurring a
substantial increase in the reflected power , due to the Q of
the 'small array' I'm sure other transmitting stations
are also in this position , which makes frequency
changing some what laborious (and wet if its
raining) , the fixed beacons in the USA are now
centred on the lower frequency .
Its now common to
find stations monitoring ,one or the other of
the frequency's for wspr , which effectively prevents the spot capture
of any TA opening by EU based stations monitoring
502.4 and vice versa , In point, Last Sunday
night at 21:30 gmt Joe VO1NA
decoded my ROS data signal. while
- NO TA - spots where showing on wspr , usa and eu where
monitoring each owns frequency slots
Band Police :
Well as recently
demonstrated in Egypt even the police can
feel hard done by , Those based in the Uk may well
be veterans of the 'war of the beacons' a sort
variation of the HG well's war of the worlds ,
where automated mania set in and by the discovery of
ground wave , destroyed reception south of Watford gap ,
so I can understand there may be a little residual 'high
tension' in the 'air'
Summery
Side band
interference from the 504 signal seems to be wider
and is causing problems with ROS
and WSPR decodes (no sun spots ?)
TA monitoring has
become divided rendering it ineffective and not capable
of catching 'flash' TA or other openings
ROS MF (100hz)
data mode frequency has been re defined
as 500K dial set ,
putting it 500Hz inside the lower band edge
Ae bandwidth
considerations prevent TX stations from frequency
change , hampering wspr QSY
Each to his own
of course , but a little alignment always
helps !
G ..
Sent: Tuesday, February 15, 2011 11:21 AM
Subject: LF: Re: RE: Alignment of (Narrow Band) DATA and WSPR
frequency’s on the 500 KHz band.
This seems a sensible approach. Time division. Keep to the
same freq in time slots.
g3kev
----- Original Message -----
Sent: Tuesday, February 15, 2011 7:23
AM
Subject: LF: RE: Alignment of (Narrow
Band) DATA and WSPR frequency’s on the 500 KHz band.
Hello Graham,
I would suggest to have all digital modes as
close as possible to the band edges, leaving the band centre for
CW.
For WSPR there are currently 2
segments: one for EU stations to transmit on (503.9kHz +/- 100Hz) and one NA
stations to transmit on (501.1kHz +/- 100Hz) to avoid local QRM (or better
said RX overload).
So 503.7kHz +/- 100Hz and/or 501.3kHz +/- 100Hz
for other digimodes ?
It would be possible to have a single data
segment for EU and NA it we go from frequency division to time division: if
all EU stations would transmit in the xx:00-xx:02, xx:04-xx:06, xx:08-xx:10
... time slots and all NA stations in the xx:02-xx:04, xx:06-xx-08 ... time
slots they can use the same frequency without local QRM.
But this would require a minor chang in the WSPR
software (and maybe also other software).
73, Rik ON7YD - OR7T
Alignment of (Narrow Band) DATA and
WSPR frequency’s on the 500
KHz band.
The original wspr frequency
502.4 was
defined as the
working frequency to
utilise the ‘clean’ area just
under the 504 harmonic, whilst avoiding
the various beacons
running across the
501/504 band at the time.
However, time has moved on and there are now numerous ‘dial setting’s’ in use
both sides of the Atlantic.
Due
to an apparent increase
in the side band
noise from the 504 signal ,
possibly by enhanced propagation ,
the ROS MF (100 hz b/w)
working frequency is to be re defined
as 500 USB dial set
giving a centre
carrier frequency of 501.500
Due to Ae
bandwidth and perhaps
alignment with
other band’s,
I would suggest
the original WSPR 502.4K is
replaced with the lower frequency
of 495.9K , thus
restoring the System’s coverage
and facilitating changes
of mode etc within a narrow bandwidth.
I don’t
see this
detracting from the monitoring of
spot frequency beacons
over 505Khz , but more appropriate
to transmitting stations ,
which by the nature of the
antenna arrays are not
able comfortably to
qsy from top
to bottom of the band
without re-tuning, not always a simple
option.
Comments or suggestions
please ?.
Graham
G0NBD
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