Operating instructions

OPERATING MANUAL 2945A
46882-311D B-7
Features
This accessory is used to measure forward power, reverse power and VSWR in coaxial RF
transmission lines and antenna systems. There are two versions as follows:-
70 MHz to 1 GHz 54421-016
400 MHz to 1 GHz 54421-018
There are no controls fitted to the Light-weight Directional Power Head. RF line input and output
connections are by ’N type’ connectors. A multicore lead with an 8 way DIN connector at the end
supplies the connection to the service monitor.
The Light-weight Directional Power Head is not unique to the Communications Service Monitor
2945A, therefore an active adaptor is supplied. This connects between the ACCESSORY socket
on the service monitor and the connecting lead from the power head.
Performance data
RF frequency range
70 MHz to 1 GHz (54421/016)
400 MHz to 1 GHz (54421/018)
RF power measurement
Display resolution 0.1 dB
Input power
400 MHz to 1 GHz 20 mW to 50 W; CW, PEP
Accuracy <±1 dB (P = 1 W)
typically 0.5 dB (P = 1 W)
Input power
70 MHz to 400 MHz (54421/016 only)
70 to 88 MHz 0.5 W to 50 W
88 to 180 MHz 0.25 W to 50 W
180 to 400 MHz 0.1 W to 50 W
Accuracy
70 to 88 MHz <±1.5 dB (P = 10 W)
88 to 180 MHz <±1.5 dB (P = 5 W)
180 to 400 MHz <±1.5 dB (P = 2.5 W)
Display Watts
Barchart
VSWR measurement
Range 1.2 : 1 to 10 : 1
Resolution 0.1 : 1 (VSWR 1 : 1 to 3 : 1)
0.2 : 1 (VSWR 3 : 1 to 5 : 1)
0.5 : 1 (VSWR 5 : 1 to 10 : 1)
Display Numerical
Barchart
Indication of antenna short circuit
Red LED on the power head