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
