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Astro 25 Simulcast: max number of sub-sites

maus92

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I'm watching 3 jurisdictions rebuilding their TRSs from Smartzone to Astro 25 infrastructure. Two systems currently use a single simulcast zone of 10 subsites sites, while the third use two zones of >= 10 subsites per zone. I know that SmartZone has a limit of 10 subsites per simulcast zone (maybe 11 with some trickery,) but Astro 25 allows more sites per simulcast zone. The two single zone Smartzone systems are being rebuilt to single zone Astro 25 with 22 subsites - I'm curious if 22 is now the upper limit of subsites per simulcast cell, or is this just a coincidence? Note that the third system is retaining the two simulcast site design, but now has 33 subsites in total.
 

GTR8000

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An ASTRO 25 simulcast subsystem can have up to 32 subsites with up to 30 repeaters per cell. That limit applies to all M cores.

In case you're wondering, an M1/M2 core can support up to 24 non-simulcast sites (ASR) with up to 28 repeaters per site, however the maximum amount of channels systemwide is 300. The M3 core can support up to 150 non-simulcast sites with up to 28 repeaters per site, with a maximum of 1,000 channels per zone.
 

GTR8000

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M1/M2
1 zone
300 channels per zone (trunked or mixed trunked/conventional)
24 ASR with 28 RF channels per
32 simulcast subsites with 30 RF channels per

M3
7 zones
1,000 channels per zone (trunked or mixed trunked/conventional)
150 ASR with 28 RF channels per
32 simulcast subsites with 30 RF channels per
 

RFI-EMI-GUY

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There are some practical limitations to the numbers of sites in simulcast mode due to coverage overlap, time differential interference, etc. It is difficult to keep everything in same phase everywhere over a wide area of coverage. Even if you could ideally have 32 sites, changes in propogation such as tropo ducting will smack you with TDI from a distant site.
 

ILMRadioMan

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That assumes the towers are in close proximity to each other, and there are more than one in overlap area.

While that is absolutely the most common application, there are simulcast designs for wider areas, and also underground where there isn't TDI.
 
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