Hi all,
ZL6QH will carry out LF beacon transmission during ZL hours of darkness on
Friday 27, Saturday 28 and Sunday 29 December. The same format as previous
beacon tests will be used, with 120 second dot length, 0.42 Hz FSK, with
transmission code repeated QQQQQ.... with each Q coded as [hi hi lo hi off]
:
hi = 137.7890 kHz
lo = 137.7886 kHz
Timing will be such that the start of a Q coincides with the hour. It takes
10 minutes per Q, so there are six Qs per hour.
The DDS exciter has a frequency shift of 0.42 Hz, and the tones should be
within 0.1 Hz of the declared frequencies. If the SSB backup exciter needs
to be called upon, the frequency shift would be 0.4 Hz.
The ZL hours of darkness in late December are nominally 0750 UTC (sunset)
till 1655 UTC (sunrise). The beacon will be transmitting from before
sunrise till after sunset each night, and close down during daytime (summer
holidays downunder ...).
73, Bob ZL2CA
|
