I have several 110W Syntor X lying around. It is probably no longer my interest to get them working by the means that XCat or Piexx offered... But the RF frontend still holds promise with SDR applications. Has anyone documented the signaling for the RX LNA, TX PA, T/R switch, and feedback monitoring? Would love to hook them all up to an Arduino (or similar) GPIO header.?

I have several 110W Syntor X lying around. It is probably no longer

> my interest to get them working by the means that XCat or Piexx
> offered... But the RF frontend still holds promise with SDR
> applications. Has anyone documented the signaling for the RX LNA, TX
> PA, T/R switch, and feedback monitoring? Would love to hook them all
> up to an Arduino (or similar) GPIO header.

The internal control setup in an X isn't all that complex. But note
that those subsystems are scattered across multiple boards. The radio
isn't up to 9600 baud packet signalling, and the turnaround time isn't
all that quick. If those things don't counterindicate your proposed
application, then the Moto manuals (try repeaterbuilder.com) and
onfreq.com have the information you'd need.

De

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.

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

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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

Syntor X radios are fantastic radios, but they are terribly complex inside. On the other hand the new stuff has it all baked onto a chip and not much to play with.