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

<470 MHz
>470 MHz
Tx isolation*
<470 MHz
>470 MHz
Antenna Connector
Rx/Tx Output Connector
* 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)

Frequency range
Insertion loss Tx*
Insertion loss Rx*
VSWR max.
Rx isolation*
Tx isolation*
Minimum Tx-Rx Frequency
Spacing
Antenna Connector
Rx/Tx Output Connector
* 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)

Operating Frequency
Range
Duplexer Spec Limit
(UHF)
100 dB
100 dB
100 dB
100 dB
N female
N Female
Duplexer Spec
Limit (VHF)
136–146 MHz,
144–160 MHz,
158–174 MHz
1.3 dB
1.3 dB
1.5:1
75 dB
75 dB
1.5 MHz
N female
N Female
External Dual Circulator Spec Limit
(700/800 MHz)
762–870 MHz
Chapter 10: GTR 8000 Base Radio Reference
Typical Notes
R/T 5 MHz
R/T 3 MHz
R/T 5 MHz
R/T 3 MHz
Typical
0.7 dB
0.7 dB
1.2:1
80 dB
77 dB
MN003286A01-E
Notes
Typical
273