MDC1200 preamble use

[merlin]

There is a Harris TSM describing the configuration of G-Star for compatibility with Motorola systems with MDC.
Really simple and a matter of using 1800/1200 Hz for tones and setting the tone timing as needed.
Nothing mentioned regarding the displaying of packet info, but to access a Moto repeater, yes.
The point of APCO P25 is for compatibility between different systems, especially digital.

 

[RussH]

Modern GE/Ericsson/Tyco/M/A-Com/Harris/L3Harris (whatever we want to be today) are able to seamlessly integrate this functionality. We're running a multi-vendor environment on MDC-1200 and have no issues amongst subscribers.

 

[mmckenna]

Modern GE/Ericsson/Tyco/M/A-Com/Harris/L3Harris (whatever we want to be today) are able to seamlessly integrate this functionality. We're running a multi-vendor environment on MDC-1200 and have no issues amongst subscribers.

Right, the patent on MDC1200 expired a few years ago. Most of the big manufacturers added the functionality around that time. Kenwood released some firmware that added the feature to many of the radios at the time. All the Kenwood stuff I've purchased at work in the last 10 years or so have all been MDC1200 capable.

 

[RussH]

All the Kenwood stuff I've purchased at work in the last 10 years or so have all been MDC1200 capable.

Same with us

 

[IFRIED91]

The

Right, the patent on MDC1200 expired a few years ago. Most of the big manufacturers added the functionality around that time. Kenwood released some firmware that added the feature to many of the radios at the time. All the Kenwood stuff I've purchased at work in the last 10 years or so have all been MDC1200 capable.

I believe the patent for only the ID feature expired… DOS muting looks to still be a Motorola only thing.. vertex had it also but needed an option board made by a completey different manufacturer so Technically I don’t count em either

 

[mmckenna]

The

I believe the patent for only the ID feature expired… DOS muting looks to still be a Motorola only thing.. vertex had it also but needed an option board made by a completey different manufacturer so Technically I don’t count em either

DOS muting seems to work fine on my Kenwood radios.

 

[rescue161]

DOS muting seems to work fine on my Kenwood radios.

Not on the NX-5800 that I had and especially not on Post-ID. That was driving force for why I abandoned that line and went back to Motorola.

 

[IFRIED91]

Not on the NX-5800 that I had and especially not on Post-ID. That was driving force for why I abandoned that line and went back to Motorola.

Yeah I have to agree with rescue…Harris attempted DOS muting by adding that MDC STE option which you told me LEAVE IT BLANK due to falsing

 

[IFRIED91]

And kenwood i can’t speak for them since I never used the new ones… I think EF Johnson can DOS mute since they are basically mirror images of Motorolas in terms of operating system and software

 

[Giddyuptd]

DOS muting seems to work fine on my Kenwood radios.

Why majority dont pre ptt mdc ill never know. It comes in handy with Dunlap keyups banging the console or door. Though those make for some interesting moments not ideal on a PS system to hang things up.

 

[Giddyuptd]

the NX line if programmed right will mute pre mdc. Though if your city uses a muting at voter level this would be solution for post mdc muting 😉

 

[902]

I can say that BK P150 and M150 radios do pre- and post- MDC1200 signaling, but do not do DOS or preamble functions. I brought the concept of DOS up once in Melbourne a few years ago and they looked at me funny. Their P150 line just discontinued production, so I'm unclear about future product features. Also, the Telex Vega C-Soft console will decode and display, as well as outwardly signal in MDC1200, but also does not mute during reception. It would be very nice if it did.

I had a fairly large fleet of EFJ 5100 and 5300 radios with an expansive aviation-based organization. The radio system that supported those radios did not use MDC, so I never tried it (although we used P25 discrete user ID but never could standardize on what exactly to put in there, so most IDs were "1"). They are NOT just like Motorolas, although the 5100 series shared Motorola RSMs, batteries, etc., they had far more problems than an XTS or Spectra/XTL and used independently developed firmware and software, among various hardware and construction technique differences.