As "someone" here stated that I'm too grumpy and dense to be appreciated on that forum (the same kind of guy who couldn't differentiate a KYK-13 from a MX-18290 even if his life depended on it
) I don't know why I feel inclined to answer here and not "on that other forum" from which we're both members, and is far more "professional" (wink)...
Maybe it's because of your georgous photographs and odball radio stuff ? (BTW keep up the good work
)
So here ya go :
-DTMF based "pseudo-trunking" : Western Radio "Trac" System with it's DTMF homing channel (worked a bit akin to actual Moto Capacity Plus)
Ontario, Canada, later replaced by a MPT1327 system.
-MDC based "pseudo-trunking" : OPP (Ontario Provincial Police) NOR system
It used analog "Special Product" Spectra with custom MLM and custom firmware (the remote mount interconnect board was also heavily modified), and a very customized control head (special RSS needed of course !).
IIRC, most sites had two (or three) voice channels and the channel that wasn't in use was usually "acking" away (IIRC it used MDC-600 as a control channel).
The phone patch option was rather weird too, the unit sent MDC-600 bursts for each digit dialed which the repeater converted to DTMF tones...
It was later replaced by a VHF SmartZone system.
I still have a sound sample of the NOR MDC system and would have glady attached it here, but that forum doesn't accept WAV, too bad !
PS : Just for completeness sake, here is a description of the MultiAx (Australian) system, which could be classified as a "pseudo-trunk" system :
"A MutiAx (Multiple Access) channel is effectively a list of Community Repeater Channels.
While there is no signal present, the radio scans all channels for a signal.
When a signal is found, the radio checks it for CTCSS and, if correct, listens on that channel, allowing PTT if the user PTTs.
If a non-valid CTCSS is detected, the radio resumes scanning.
When the user presses PTT (if not already listening on a channel) then the radio searches for the first free channel and transmits there.
This allows the traffic capacity of a Community Repeater site to be increased by simply adding co-sited community repeaters.
The radio does all the hard work of determining which channel to listen to or to use."
MultiAx is NOT a variant of MPT1327/MPT1343 (as stated on Wikipedia) !
MultiAx operates on CTCSS to separate operational groups and does not comply with these standards.
It is a multi-group multi-access system which can also be multi site.
It supports fewer fleets or groups than MPT1327/1343 but can have lower infrastructure costs than MPT1327/1343
There's still lots of strange trunking protocols in this world; past like the French Alcatel DIVA system (similar to GE Marc V), or present like the Japanese MCA digital system for example, but that's a story for another time... ;-)
