Motorola ASTRO 25 GTR 8000 - Duplexer Specifications (VHF); External Dual Circulator Specifications (700;800 Mhz); Table 73: Duplexer Specifications (VHF); Table 74: External Dual Circulator Specifications (700;800 Mhz)

Duplexer Spec Limit
(UHF)
Typical Notes
<470 MHz
>470 MHz
100 dB
100 dB
R/T 5 MHz
R/T 3 MHz
Tx isolation*
<470 MHz
>470 MHz
100 dB
100 dB
R/T 5 MHz
R/T 3 MHz
Antenna Connector N female
Rx/Tx Output Connector N Female
* For <470 MHz R/T can be as low as 3 MHz and for >470 MHz R/T can be a low as 2 MHz; however,
insertion loss or isolation specs may not be met.
10.2.7
Duplexer Specifications (VHF)
Table 73: Duplexer Specifications (VHF)
Duplexer Spec
Limit (VHF)
Typical Notes
Frequency range 136–146 MHz,
144–160 MHz,
158–174 MHz
Insertion loss Tx*
1.3 dB 0.7 dB
Insertion loss Rx* 1.3 dB 0.7 dB
VSWR max. 1.5:1 1.2:1
Rx isolation* 75 dB 80 dB
Tx isolation* 75 dB 77 dB
Minimum Tx-Rx Frequency
Spacing
1.5 MHz
Antenna Connector N female
Rx/Tx Output Connector N Female
* Minimum Tx-Rx spacing may be as low as 1.0 MHz; however, insertion loss of isolation may not be
met.
10.2.8
External Dual Circulator Specifications (700/800 MHz)
Table 74: External Dual Circulator Specifications (700/800 MHz)
External Dual Circulator Spec Limit
(700/800 MHz)
Typical
Operating Frequency
Range
762–870 MHz
MN003286A01-E
Chapter
10: GTR 8000 Base Radio Reference
273