I use several Zetron Z38A controllers that I obtained surplus on amateur
repeaters and make use of the CTCSS encode and decode built into this
controller. (Vintage 1988) Even back then the controller provided for
terminating the transmit CTCSS as soon as the user un-keys. Or you can program
it to extend the CTCSS to the end of the tail and add the STE reverse burst.
This makes in-band links a cinch useing the encode/decode functions in the link
radio.
I also use a PSE-508 on one of my repeaters and make use of the CTCSS decode.
73 - Jim W5ZIT
Nate Duehr <[EMAIL PROTECTED]> wrote:
skipp025 wrote:
> ctcss logic back to an external repeater controller
>
> I've been talking with a small number of people off the group about
> external repeater controller interface logic lines. In specific how
> many of the external repeater controllers handle ctcss (sub-tone, aka
> PL) detection, logic, control and selection.
>
> To keep things short and simple... let us assume an example of the
> two most common repeater controller layouts regarding ctcss operation.
I'll see your two examples and raise you one, Skipp. (GRIN! Or maybe 2...)
Example 3:
At least two controllers now support CTCSS detection and/or generation
directly in the controller.
The S-Com 7330 (currently in beta test) offers CTCSS encode, but not
decode:
http://www.scomcontrollers.com/
The PSE-508 series from Pion and Simon Electronics handles both encode
and decode, but is built to be installed into a specific repeater, the
GE MASTR II. (In fact, their latest software rev offers 4 CTCSS tone
"community tone panel"-like functionality.)
http://www.pionsimon.com/products.htm
Wasn't there also a Pacific Research controller that did one or both of
these at one point? They've always been too expensive for me, but I
thought one of their boxes did it... maybe... ?
I think putting the encoder/decoder up in the controller is "the wave of
the future"... if done right, it should make things a lot simpler in the
long-run... no fussing with CTCSS boards in any fashion, just bring
discriminator audio to the controller and find a place to send audio
back that isn't high-pass filtered... done deal...
The controller folks making the CTCSS circuits have to go out and get an
"edumacation" on Reverse-Burst/STE and all that fun and games though, if
they want to fully emulate the original manufacturer's boards... I know
the 7330 is going to have the option to do "either type" of phase shift
on their encoder, for example. Not sure if the P&S does RB/STE at all.
Example 4:
Go digital, leave the silly CTCSS behind. The 70's are calling and they
want their repeater back!
Heh heh. :-) :-) :-) !!!
Nate WY0X
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