UHF Radio Communication System Design Considerations
Design Considerations
- Designer shall estimate the number of frequency channel pairs for UHF Trunked Radio System at site, based on number of user talk groups.
- The complete radio system design shall comply with all the requirements mentioned in HCIS directive SEC-08 and SES-K01-E01.
- All the frequency channel pairs shall be pre approved by CITC before procuring the radio equipment.
- The radio system shall be class-A UHF and shall consist of sufficient repeaters, base stations, handheld radios to support specific number of user talk groups.
- The radio system shall provide communications coverage within authorized operating zones that shall be non-fading, electromagnetic interference free, with high voice quality. All radio
devices shall conform to part 15 of FCC rules. - Designer shall ensure, the radio equipment specifications conform with ETS 300 113, for the following parameters as minimum:
a. Frequency error
b. Adjacent channel power
c. Spurious emissions
d. Receiver sensitivity
- There shall be equal number of trunk repeaters and frequency channels to support the required number of frequency channel pairs for ensuring non blocking radio traffic during peak usage.
- The radio system shall be engineered for 99.99 percent availability with MTTR of 8 hours.
- All portable units and accessories shall be suitable to the specified hazardous classified area.
- The system should include but not limited to the following components of a radio system:
a. Trunk repeater
b. Transmitter combiner
c. Receiver multi coupler
d. Antennas
e. Site controller
f. Antenna tower
g. Feeder cables
h. System manager (computer, software, printer, keyboard, display)
i. Base station (transceiver) inclusive of transmitter combiner and receiver multi-couplers
where required
j. Desktop base station with push–to-talk (PTT) button, microphone and speaker
k. Base station towers and antennas with mounting hardware
l. Portable handheld radios with accessories
Voice and data recording
It shall comply with the requirements of HCIS directive SEC-08.
Propagation and System Dimension Study
This study shall be done by an experienced agency. Contractor shall review, validate and clarify survey results and engineer a system to suit all requirements.
Site conditions
Refer to BEDD for details.