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Apply to a clean extract of gmfsk-hkj50.

Here's what this one does:

DominoEX: adds squelch and secondary text. This is the result of a few experimental diffs flung between myself, W1HKJ and VK3SB a month ago.

MFSK16: On idle, sends one null pattern then settles on the bottom tone.

RTTY: On idle, just sends a constant mark tone. Apparently, this is common behavior for mechanical setups.

FM Hell: On idle, carrier power is reduced by 6 dB, and dots are no longer sent.

-Joe, KD8ATU

Can these features be individually turned on and off?
Some of them seem like a good idea in general, and some
do not.

It's true that mechanical RTTY setups send constant mark
tone when there is nothing to send - but there are technical
and operational reasons to send diddles. They do annoy the
mechanical TTY users; but one can argue that the solution
to that is to make an electronic box that will keep them from
reaching the machine. The advantages of diddles are (1) you
know it's a RTTY signal, not just some carrier sitting there,
(2) modern demodulators take advantage of having both mark and
space tones preset pretty often, to judge the levels of them.

I'm also unsure of the virtue of the MFSK mode sending one
flop and then settling on one tone. Again there is the problem
that it just sounds like some random carrier, so the guy
tuning around doesn't recognize the signal for what it is.

Once (if) these get added to the mainline, there'll be options in hkj-config.h to disable them. For now, just decompress the file and edit it. To remove the RTTY hack, just delete the blocks that alter files in the src/rtty directory, for the MFSK hack do the same to the ones that affect the src/mfsk directory.

-Joe, KD8ATU

jhaynesatalumni wrote: