Trunking Frequency Constraints

(Glossary)

The CPS uses internal rules to validate all Control Channel and Failsoft frequencies entered by the CPS-user. The particular rules applied depend on the Trunking System's System Type (and hence, the Trunking Personality's Protocol Type) and the current frequency band ( OBT / 700 / 800 / 900 MHz).

Protocol Type:	Frequency Band	Control Channel and Failsoft Frequency Constraints:
Type II	OBT	Rx / Tx frequencies are validated against frequency parameters entered in the OBT Channel Assignment list defined for the referenced Trunking System. In addition, that System's Type II Frequency Band field must be set to the desired band: "VHF", "UHF1", or "UHF2".
Type II	800 MHz	Rx frequencies must be valid values for the frequency range predefined for the radio's codeplug. Tx frequencies must be set to exactly 45 MHz less than the corresponding Rx frequency. In addition, that System's Type II Frequency Band field must be set to "700 / 800 MHz". Type II is not supported in the 700 MHz band.
Type II	900 MHz	Rx frequencies must be valid values for the frequency range predefined for the radio's codeplug. Tx frequencies must be set to exactly 39 MHz less than the corresponding Rx frequency. In addition, that System's Type II Frequency Band field must be set to "900 MHz".
ASTRO 25	700 / 800 / 900 MHz	Rx frequencies must be valid values for the frequency range predefined for the radio's codeplug. In the 700 MHz range, Tx frequencies must be set exactly 30 MHz higher than the corresponding Rx frequency. In the 800 MHz range, Tx frequencies must be set exactly 45 MHz less than the corresponding Rx frequency. In the 900 MHz range, Tx frequencies must be set exactly 39 MHz less than the corresponding Rx frequency.
ASTRO 25	OBT / 700 / 800 / 900 Rx	Rx frequencies must be valid values for the frequency range(s) predefined for the radio's codeplug, and Rx frequencies are validated against all ASTRO 25 Channel ID records / rows previously defined for the referenced Trunking System, in the range defined by: (a) Minimum Frequency = Base Frequency. (b) Maximum Frequency = Base + {Channel Spacing times 4095), (c) The (Maximum Frequency - Minimum Frequency) range value must be evenly divisible by the Channel Spacing.
ASTRO 25	OBT Tx	Tx frequencies must fall within the same bandsplit as the corresponding RX Frequency, and Tx frequencies are validated against all ASTRO 25 Channel ID records / rows previously defined for the referenced Trunking System, in the range defined by: The same rules as OBT Rx, or The Minimum Frequency and Maximum Frequency may be offset (plus or minus) by an amount / direction determined by the Transmit Offset / Transmit Offset Sign.