info about Moscow Russia FD radio system

https://kenwoodcommunications.co.uk/comm/case-studies/radioactivity-cs/fire-brigades/

Lastly, the customization of the frequency band in the 479-490 range,
facilitated its introduction in one of the region's networks.

The simulcast system deployed by Radio Activity, in partnership with
MPT-Service project, is composed of 3 huge networks to cover Moscow,
with 10 base stations each. MPT-Services managed the installation of
the system and provided combiners, power supply and all the necessary
accessories to complete the system.

In the past, the city of Moscow used to install a repeater and voting
system for each channel.
This solution, in a network composed of 13 analogue channels, could
not provide sufficient high quality coverage in an urban environment.
Furthermore, the fact that the radio frequency equipment deployed in
the past used separate antennas, was often the cause of bad
interference.




The city is divided into 10 administrative regions, covered by 7
smaller networks, with 2 base stations each and 3 smaller networks
with 3 base stations each. Each base station includes equipment for 3
оr 4 frequency channels for MPT- 1327 trunking system, plus 1-4
channels for simulcast. Simulcast networks and trunking networks use
common combiners and antennas. The new simulcast equipment uses space
diversity receivers and antennas. All receivers use mast mounting
filters and low noise amplifiers.

old system had 13 analogue channels