Aeroflex 2948B Betriebsanleitung PDF herunterladen (Seite 235)

DIRECTIONAL POWER HEADS

A-7

Features

This accessory is produced by IFR Ltd for use with certain of their Radio Test Sets and

Communications Service Monitors. It is used to measure forward power, reverse power and

VSWR in coaxial RF transmission lines and antenna systems. There are two versions as follows:-

Frequency range Part no.

1 to 50 MHz (HF) 54421/002

25 to 1000 MHz (UHF) 54421/003

There are no controls fitted to the Directional Power Head. There are RF line input and output

connectors, and a DIN socket for the lead to the Service Monitor (or test set). A 1 m lead

assembly is available as an optional accessory. As the Directional Power Head is bi-directional, it

can be connected either way round in the RF line.

The Directional Power Head is able to measure CW power or give an indication of peak envelope

power (PEP) for AM and SSB. The [PEP/CW] key on the directional power meter screen is used

to select the required measurement method.

A wide measurement range is available for both forward and reverse power. This can be from

10 mW to 400 W under certain some operating conditions. Range selection is automatic,

controlled by the software within the Service Monitor (or test set).

A system of compensated peak responding detectors is employed to ensure fast response times and

a wide dynamic range. It should be noted that the instrument is accurately calibrated for signals

with low harmonic content and noise.

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Aeroflex 2948B Betriebsanleitung Seite 235