Hi Michael and Bill
The meaning of the single tones for JT4 are as follows:
1000 Hz = tune
1250 Hz = please send messages
1500 Hz = RRR
1750 Hz = 73
Joe still intends to provide the same single tone messages for QRA64 as they
are about 4 dB easier to detect than the QRA64 progressive AP system. But
at present we manually insert them for QRP EME using the @XXXX feature.
Not sure if it is relevant to what Michael is doing but JT4f and QRA64 use
messages of the form Call+Call+signal report rather than OOO and RO style
signal reports.
I am also not sure what is the intended use of the test messages but WSJT-X
already includes simulators that can be used for testing that provide
messages with specified S/N and spreading. The shape of the spreading does
vary with frequency and G3WDG has produced simulators that can be inserted
in WSJT-X for JT65, JT4 and QRA that use spreading shapes specific to 10 GHz
EME. In the long run it might be useful to have the simulators with
adjustable shapes for each band but this is not a priority.
73 Rex VK7MO
From: Bill Somerville [mailto:[email protected]]
Sent: Friday, 28 April 2017 5:21 AM
To: [email protected]
Subject: Re: [wsjt-devel] Test messages
On 27/04/2017 20:15, Black Michael wrote:
So sounds like JT4 need the same added messages as JT65/JT9
Hi Mike,
no I don't think so. JT4 uses single tones for the "short codes", they are
not generated by the message encoding routines but synthesized directly by
the Modulator class. Otherwise you are correct.
73
Bill
G4WJS.
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