NSW P25 GRN - Site Listing (current)

[citabria]

My understanding is there are two types of simulcast - C4FM and LSM.

Correct.

a TX carried on one site will also be carried on the other site at the same time on the same frequency.

Can you give me the specific sites and frequencies please?

[citabria]

My understanding is there are two types of simulcast - C4FM and LSM.

Correct.

a TX carried on one site will also be carried on the other site at the same time on the same frequency.

Can you give me the specific sites and frequencies please?

Until now there have been no live simulcast sites with overlapping coverage that would require LSM. This Strathfield site would be the first confirmed LSM site operational.

That's because that isn't simulcasting. Unless there is overlap, with a GPSDO simulcast controller that's locked to a universal GPS derived 1PPS time synchronisation source, and a variable launch time delay per Tx, then it's not simulcasting. A hidden host rebroadcasting is not simulcasting in the strict definition.

[citabria]

My understanding is there are two types of simulcast - C4FM and LSM.

Correct.

a TX carried on one site will also be carried on the other site at the same time on the same frequency.

Can you give me the specific sites and frequencies please?

Until now there have been no live simulcast sites with overlapping coverage that would require LSM. This Strathfield site would be the first confirmed LSM site operational.

That's because that isn't simulcasting. Unless there is overlap, with a GPSDO simulcast controller that's locked to a universal GPS derived 1PPS time synchronisation source, and a variable launch time delay per Tx, then it's not simulcasting. A hidden host rebroadcasting is not simulcasting in the strict definition.

[citabria]

My understanding is there are two types of simulcast - C4FM and LSM.

Correct.

a TX carried on one site will also be carried on the other site at the same time on the same frequency.

Can you give me the specific sites and frequencies please?

Until now there have been no live simulcast sites with overlapping coverage that would require LSM. This Strathfield site would be the first confirmed LSM site operational.

That's because that isn't simulcasting. Unless there is overlap, with a GPSDO simulcast controller that's locked to a universal GPS derived 1PPS time synchronisation source, and a variable launch time delay per Tx, then it's not simulcasting. A hidden host rebroadcasting is not simulcasting in the strict definition.

[citabria]

Page 8 of this PDF :-https://cms1files.revize.com/montgomery ... ument).pdf

[Scotty]

Can you give me the specific sites and frequencies please?

Can't give you the frequencies or full details while mobile, but off the top of my head 3-014 as mentioned is one and another one is at Bingara.

That's because that isn't simulcasting. Unless there is overlap, with a GPSDO simulcast controller that's locked to a universal GPS derived 1PPS time synchronisation source, and a variable launch time delay per Tx, then it's not simulcasting. A hidden host rebroadcasting is not simulcasting in the strict definition.

I can't comment on the strict definitions, however those sites do 'simulcast' transmissions for the lay user. I understand it's not LSM (and wouldn't fall under the definition of LSM) but what would be the term for what these other sites doing if not 'simulcasting' the transmission?

[Mike Alpha]

The defining difference between a hidden host system and a LSM simulcast system is the overlapping of frequencies and the proximity of each site to the other sites. With hidden host systems, the "slave" sites are isolated, usually indoors or in tunnels, so no chance of overlap will occur.

For example, Horsley Park has a hidden host site on 500MHz linking many other sites, such as Bass Hill Plaza, Liverpool Westfields and Penrith Wesfields all on the same frequencies internally, so they would never overlap and hence, not cause inteference to each other.

True LSM Simulcast systems using CQPSK have multiple sites that are all on the same frequency but also within reception distances of each other. If the GPS synchronisation and the other magical technology Citabria mentioned wasn't in play (the audio is held till synch on all sites happens...bloody amazing!) the radios would not work as the same frequency is received from multiple nearby sites. I've read that in the USA, multiple LSM sites are known as one site.

So get ready as more LSM sites go online for frustrating reception issues on our mere C4FM scanners.

Mike

[citabria]

I can't comment on the strict definitions, however those sites do 'simulcast' transmissions for the lay user.

No they don't. You are simply confusing things and when REAL simulcast appears, the poor lay user is going to be even more confused....

what would be the term for what these other sites doing if not 'simulcasting' the transmission?

As per Mike's post above, they are Hidden Host master/slave sites. This is pretty much an accepted term in the industry.

[JAFO]

Morning all,

I'm doing an update of my Uniden Sentinel entries, and have notice in one of cartman's updates in 2021 he has listed "002-083 Forest Hill".

In my Sentinel entries I have Z2-083 listed as "RAYMOND TERRACE'. Tried searching the forum and see a separate entry for "005-047 Walcha Road NSW", which it's site has "Forest Hill" indicated on ACMA Site Search.

I'm at a lost, can anyone shine some more light on the location of "002-083 Forest Hill"?

Grant

[citabria]

Raymond Terrace is 002-087
Forest Hill is 005-047

Forest Hill used to be 002-083 from memory.