[VIC] Metropolitan & Regional Mobile Radio (VICMMR / VICRMR)

[Bigfella237]

Do you think to save yourself a heap of work on the SAGRN - wait until they have made the P25 change over? Moto now has the contract and they going to upgrade it...sometime

I reckon that South Aus will start their upgrade once NSW is done'n dusted and they can ship all our Moto techs over there! (Another advantage of having a national corporation doing the upgrades?)

I did think about holding off until they upgrade but I figure, as with the NSWGRN, that most of the info won't change; they should be using all the same sites and frequencies etc. and only the site numbers and CCs will change?

Andrew

[citabria]

MMR and SAGRN have simulcast?

Does NSWGRN have it too?

Yep, when I say simulcast I'm referring to sites like our Site 150 (Crown Castle) where one donor site is simulcast from a number of different 'slave' sites.

Andrew

When I say simulcast im talking about true P25 CQPSK/LSM style modulation with several transmitters operating on the one frequency in a given coverage area...

[Wonky]

Yep cita,

that is what is run on the MMR simulcast sites...

[citabria]

Awesome, I hope it comes to the NSWGRN so I can test out our Mueller-Mueller CQPSK decoder.

Unless the boys in blue are using LSM also?

[system_tech]

hi folks
* NSW GRN did not have simulcast for 4.1 (or earlier versions) (it was possible) and is unlikely to have it in P25
* Even if a telco etc was managing the NSW and SA GRNs, Mot would still be doing the upgrades as the equipment supplier / contactor so whether or not they run the network would not make much difference I would say. They did the respective 3.5 and 4.1 upgrades as a supplier / contractor adid not have any problems.

[cartman]

What on earth is a Mueller-Mueller CQPSK decoder?
Google did not help - only confuse me more


Grant

[Bigfella237]

OK, so what are we calling sites like our GRN Site 150 (Crown Castle) where there are multiple sites all transmitting the same data on the same frequencies at the same time?

[system_tech]

OK, so what are we calling sites like our GRN Site 150 (Crown Castle) where there are multiple sites all transmitting the same data on the same frequencies at the same time?

I take it you refer to donor sites that have multiple slave outlets?

If so:

* yes they are simulcast in the broad sense of the word.
* but they have discreet enclosed and/or underground coverage areas
* where the RF from one site does not meet the RF from another site due to the physical isolation
* true simulcast traditionionally means the same frequency RF is transmitted from 2 or more sites and there is cross over / overlap coverage into variuous ares but it is steered or segmented by phasing / prescise frequencies / and with P25 a sort of data manipulation.

For a basic explanation, more to do with analogue, but will give you an idea, have a look here:

http://www.signalharbor.com/ttt/00oct/index.html


Cheers

S T

[Bigfella237]

Seems the MMR is expanding!

I've just added quite a few new sites discovered to the list.

Andrew

[Bigfella237]

Another couple of sites discovered for the Victorian MMR...

Sites 204 & 214 added to the list.

Andrew