Foxhunt VK3YNG Sniffer 4 Kullanım Kılavuzu - Sayfa 3

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VK3YNG Sniffer 4 Instruction Manual (for V2.2 hardware)

Introduction

The VK3YNG sniffer is designed to allow quick, easy and accurate determination of

the direction of a transmitted signal in either the 120-123MHz or 143-150MHz bands.

The sniffer provides enough sensitivity to determine the direction of a signal from

many kilometres or miles away. This is useful for ARDF or Radio Sport use. It also

provides enough attenuation to accurately determine the direction of signals right up

to the source of the signal without suffering from overload or compression effects.

Attenuation (signal reduction) is provided automatically in steps of approximately

15dB each time a particular signal strength threshold is reached. The number of 15dB

steps of attenuation is shown on an LED display. For example, a display value of zero

indicates maximum sensitivity, where a value of 9 indicates a very strong signal that

requires approximately 135dB of attenuation.

Signal strength indication is provided by an audible tone that increases in frequency

(pitch) with increasing signal level. This is done because the human ear is a much

more sensitive to changes in pitch than sound level. There is also no inertia or

overshoot problems as tend to occur with signal meters. A special software algorithm

ensures that the received signal strength tone does not suffer from "compression"

effects that occur at higher signal levels with some designs.

Rev 2.2a

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