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
