I have built an irig b encoder. Irig uses a 1 KHZ amplitude modulated
signal. I can't remember now if it was pulse width modulation also. But it
used a small processor and todays arduino is many time more effective at
the job.
That said I used a modulator using a small xtal controlled divider to
produce the carrier. It was a Epson chip and even the xtal was built in and
a analog CMOS gate as the modulator.
Its actually fairly simple to create.
Then it was a case of reading out the clock in the correct format.

On Wed, Mar 7, 2018 at 3:05 PM, Mark Sims <hol...@hotmail.com> wrote:

> I once looked into adding IRIG generation to Lady Heather.   I never came
> up with a reliable / robust way to do it.  It could possibly be done with
> some of the Windows multi-media support, but that would leave the
> Linux/macOS/FreeBSD people in the dark.
> I just added TS2100 support to Lady Heather... but it only reads the time
> code output string and drives the clock displays.   I don't have a TS2100
> to properly test it, but it works when fed with a simulation file.
> --------------------
> > RANDOM QUESTION -- does anybody know of software to *generate* IRIG time
> code? Something in C that's adaptable to a modern micro would be good. In
> something like a Raspberry Pi 3, IRIG generation would make a nice addition
> to Lady Heather...
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