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RPM 14 software question

mancow

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I was under the impression that in Motorola systems, the difference between message and transmission trunking is in how long a channel is held open after the end of a transmission. That with transmission trunking, every time a transmission terminates, the repeater is de-keyed and returned to the pool, while with message trunking, the repeater is held open for a defined period of time to allow a reply to occur on that same repeater, reducing the need for the replying unit to wait for channel assignment when the system is busy.
That's how it was explained to me in the moto CPS programming training class.
 

IFRIED91

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Be aware that with EDACS, the channel order of the trunked frequency list has to be correct. A channel out of order will result in missed calls. Because EDACS assigns them based on that order. It's not like how a Motorola control channel does it, which is to call them by standardized channel numbers which each have a defined frequency. (Channel 123 will always be...whatever that is...) Like Marine channel 16 is always 156.800 MHz.

Oddly, I don't actually remember if a Harris P25 system uses the Motorola channel system or the EDACS logical channel order system.... I think it's the Motorola format but I'm not sure...

The Motorola format makes it easier to expand a site and add channels. You don't have to add them to the radio in any particular order.
I Believe MOST NOT all P25 systems use a standardized bandplan... There are few exceptions particularly when dealing with OBT systems close to the Canada/Mexico border

So to clarify EDACS chan order; if there is a chan number skipped on one site but appears in another site of a system, what is the correct way to enter that into the trunked freq sets?
 

ElroyJetson

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DO NOT ASK ME FOR HELP PROGRAMMING YOUR RADIO. NO.
Skipped channels in the frequency list should remain skipped. If for example, channel 5 is blank, leave it blank. Don't move the other entries up to fill in the blank space.

When the system calls for "repeater 16, transmit", then repeater 16 needs to be the proper one.
 

BMDaug

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Skipped channels in the frequency list should remain skipped. If for example, channel 5 is blank, leave it blank. Don't move the other entries up to fill in the blank space.

When the system calls for "repeater 16, transmit", then repeater 16 needs to be the proper one.
This answers a question I’ve been wondering about… I think. So in a trunked set, I would list all control capable channels first, and really that’s all I need, but I could enter other non control capable channels after channel five and then tell set the option for CC Limit to “first five”, leaving channel five blank if there are only, say four CCs at that site… I didn’t realize it would hold blank channels in the trunked set list. RPM doesn’t like blanks in other set types.

-B
 

ElroyJetson

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EDACS trunking does not work like Motorola's classic (Pre-P25) trunking formats.

A typical Motorola Smartnet system will have typically four channels that are allocated for control channel usage, and the system will rotate between those four channels so that at any given time, one of them is the control channel. Typically that channel rotates every day.

Bigger systems may have a larger pool of up to eight repeaters in the control channel pool.

You only have to enter the frequencies of those control channels into the trunked frequency list, in a system like that. You don't have to enter the voice only repeater frequencies.

EDACS has always used explicit channel assignments. There may be 20 channels at one site, and you have to enter them all and in the correct order. ANY of them may do duty as control channel on any given day.

With P25, as I understand it, it could go either way. I've never SEEN a P25 system that follows the EDACS channel list scheme, but apparently that's allowed. Typically you just enter the control channel pool and that's that.
 

carcarjg

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This link helps me get and hang of programming.

While my vid is a good resource, just keep in mind most systems do some things differently from other ones (ie: Motorola RCM ID vs TIA-102 RCM ID, PTT/Transmission/Message convo type etc. But my vid should work 99% of the time, Moto, Harris, Everstack, Semoco, Tait, etc
 
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