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The TX may have a delayed PTT logic that needs to be eliminated. I worked on a Metrocom data system for People Mover in Miami decades ago. There was a capacitor for PL reverse burst (Micors!!)? that needed to be removed or the one train that it hadn't had it removed, would collide/interfere with the next one in polling sequence. Fixed it by listening on the air for distorted data.

 > Securenet versions are signalling at 12 kbps 2 level FM so it would
 > seem the radios should be good for 9600 backet if you go past the
 > audio chain and follow Securenet paths and jumpering. Modulation Comp
 > will be a must.

I did use the Securenet pins for audio when I tried it.  It's possible I
screwed up the jumpering.  Or perhaps the modulation used by Securenet
works better than the usual ham 9600 stuff.

Turnaround time for Securenet isn't as critical as packet.  Around here,
the usual settings are faster than the Syntor X can do.

OP's application may or may not care about any of this.

De

-- 
Joe Leikhim


Leikhim and Associates

Communications Consultants

Oviedo, Florida

JLeikhim@...

407-982-0446