Receiving
GB3UHF
Monitoring the
beacon using WSJT JT65B mode
The use of JT65B enables the beacon to be received and monitored at extreme
ranges, even when inaudible in a conventional receiver bandwidth. The use of
JT65B will ensure that the user at long distances from the beacon can see if
there is any enhancement to propagation, or if propagation conditions have
deteriorated. It thus also allows automatic monitoring of the beacon over a
period of time.
Software to decode the JT65B is easily obtainable on the Internet at the
WSJT website www.physics.princeton.edu/pulsar/K1JT/
To decode the JT65B identification, tune the
carrier to obtain a tone of 1500 Hz with the receiver set to USB, and the dial
frequency reading 432.4285 MHz . The JT65B will then be tuned in correctly. The
1500 Hz AF originated from the "old" WSJT and specification when it was all
centered around 1270 Hz. In WSJT-X, and MSHV, the AF definition has since been
changed and WSJT-X can now receive tone 0 down to a couple of hundred Hz.
GB3UHF as
received on JT65B by Colin G3SPJ