User's Manual

VHF Headstation & In-Line Amplifiers
User Handbook
Handbook Nō.-50-127201FCC Issue No:-A
Date:-14/06/2005
Page:-
23 of 45
4.2 VHF 30dB Coupler (07-000108)
4.2.1 Description
The purpose of these couplers is to ‘tap off’ known portions (usually 15-30dB) of RF signal
from transmission lines, either resistively or by induction, and to combine them, for example
through splitter units for different purposes (alarms/monitoring etc.), whilst maintaining an
accurate 50Ω load to all ports/interfaces throughout the specified frequency range.
In this instance, one of these couplers is used at each antenna port, with its’ DC output taken
to the RS232 PCB in order to monitor any power output loss to the antenna.
4.2.2 Technical Specification
PARAMETER SPECIFICATION
Frequency Range: 140 – 160MHz
Bandwidth: 20MHz (typical)
Insertion Loss: <1.0dB
Rejection: >20dB
30dB Coupling: ±1dB (in band)
operation: -10%C to +60%C Temperature
Range:
storage: -20%C to +70%C