Hallo Steve,
I have this version
hl2b2_main.jic Stable release of 20191110_68p4, testing release of 20190119_69p0 Jan 20, 2020
tested, but no TX.
It appears that PTT is not evaluated.
I am using PowerSDR OpenHPSDR.
There is also no PTT_out to
switch on the BLF188-PA (quiescent current).
73, Wolfgang