PTT ID

[kb0rpj]

I hope this is the best place for this, but Ive got myself a question.

I understand MDC-1200 and maybe fleetsync can send PTT id's at the start of a transmission, so in theory, if im looking at my radio I would see an ID popup showing what radio it is.

Other than those two systems are there any other methods (analog) of PTT ID which would allow the ID of a radio to show up during the entire PTT keydown.

I know most digital methods do, but are there any analog methods?

 

[nd5y]

The only analog methods I know of use tones at the beginning and/or end of transmission.

 

[ramal121]

The other popular analog method uses DTMF, but not all radios can display the ID. In that case you'd have to use an outboard decoder like something from Cimmaron.

 

[mmckenna]

G-star, but I think that's pretty well fallen out of favor.
There was an older version of MDC-1200 called MDC-600. MDC-1200 is 1200 baud, MDC-600 is 600baud. Again, I think MDC-600 has fallen out of favor.

Icom had something called BIIS that they used for a while. I think it was there own proprietary method before the Motorola MDC patent expired.

Now that the MDC patents have expired, it seems to be showing up in many other manufacturers radios.

Then there are all the analog trunking types that will do radio ID of one type or another. Most of these use a data stream, so they could be considered a form of digital.

 

[SteveC0625]

The other popular analog method uses DTMF, but not all radios can display the ID. In that case you'd have to use an outboard decoder like something from Cimmaron.

When I started dispatching for Rochester, NY Police Department in 1976, the whole county had a GE vhf system that used DTMF for PTT ID. All the dispatch consoles had DTMF decoders built into them, and were set to hold the ID visible for several seconds.

The officers on the street never did use the system properly and always talked over the DTMF tones. We spent an awful lot of time asking units to repeat, especially those who were using a different call number from their unit number.

And towards the end of the system, the street figured out how to open up the GE control heads and change the jumpers that defined the ID. We just shut the decoders off and kept on going.

 

[kb0rpj]

G-star, but I think that's pretty well fallen out of favor.
There was an older version of MDC-1200 called MDC-600. MDC-1200 is 1200 baud, MDC-600 is 600baud. Again, I think MDC-600 has fallen out of favor.

Icom had something called BIIS that they used for a while. I think it was there own proprietary method before the Motorola MDC patent expired.

Now that the MDC patents have expired, it seems to be showing up in many other manufacturers radios.

Then there are all the analog trunking types that will do radio ID of one type or another. Most of these use a data stream, so they could be considered a form of digital.

I wonder how the analog trunking does it. Is it subaudible data?

Sent from my SAMSUNG-SM-G890A using Tapatalk

 

[mmckenna]

I wonder how the analog trunking does it. Is it subaudible data?

Sent from my SAMSUNG-SM-G890A using Tapatalk

It's on the control channel data stream.

 

[kb0rpj]

Thanks. Really is a shame that no one is making analog trunking systems anymore

Sent from my SAMSUNG-SM-G890A using Tapatalk

 

[mmckenna]

Thanks. Really is a shame that no one is making analog trunking systems anymore

Sent from my SAMSUNG-SM-G890A using Tapatalk

LTR is still being produced.

 

[kb0rpj]

Hmn. Didnt think about ltr. Most of the ltr or ltr passport systems around here have been changed to trbo

Sent from my SAMSUNG-SM-G890A using Tapatalk