To all on the RSGB reflector,
As there is now wider interest in the tests, following the ZL to VE7 result
last weekend, this information is (somewhat optimistically) being posted to
the RSGB reflector. I would also like to wish Mike ZL4OL all the best in
bettering the result this coming weekend (he is further south of ZL6QH, so
the path to VE7 is some 598 km further).
73, Bob ZL2CA
ZL6QH and ZL4OL QRSS TESTING 7 JULY
ZL6QH and ZL4OL are conducting further slow rate digital mode test
transmissions this coming Saturday, on the frequency of 184.3999 kHz. ZL6QH
will transmit from 0500 - 1230 UTC, and ZL4OL 1045 - 1215 UTC (targeting
sunrise time in VE7).
The transmission format for ZL6QH is dual frequency keying, with 0.4 Hz
shift, and "dot length" of 120 seconds. The identifier is Q, sent as "dah
dah dit dah", with "dah" as 184.4001 kHz and "dit" as 184.3997 kHz. Dual
frequency keying has equal length elements for "dit" and "dah", and only a
brief transition between elements, to save time with very slow keying, so
each Q in the ten minute repetitious sequence of QQQQQ. has the following
format:
Dah of 184.4001 kHz for 2 minutes, then a brief pause
Dah of 184.4001 kHz for 2 minutes, then a brief pause
Dit of 184.3997 kHz for 2 minutes, then a brief pause
Dah of 184.4001 kHz for 2 minutes
A silent period of 2 minutes
Repeated for the whole session
The transmission format for ZL4OL is single frequency keying, with 184.3999
kHz carrier, and 120 second "dot length". This is deliberately arranged to
be "inbetween" the dual frequency keying of ZL6QH, and allows one correctly
tuned Argo screen to be able to capture either signal. The identifier is O,
sent as "dah dah dah", so each O in the 15 minute repetitious sequence of
OOOOO. has the following format:
Dah of 184.3999 kHz for 2 minutes
Silent for 2 minutes
Dah of 184.3999 kHz for 2 minutes
Silent for 2 minutes
Dah of 184.3999 kHz for 2 minutes
Silent for 5 minutes
Repeated for the whole session
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