Foxhunt VK3YNG Sniffer 4 사용 설명서 - 페이지 12

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

Configuring the Sniffer

The MK4 sniffer has a number of configurable features. Some of these have already

been described in the previous sections. The rest are explained here.

There are four levels of filtering available on the MK4 sniffer. These are selected by

holding buttons 1, 2, 3 or 6 when powering up the sniffer. The sniffer will retain this

setting until the next time it is changed.

This level of filtering is the same as the original MK4. It offers the fastest and most

accurate tracking of the received signal level. On transmitters with a high AM

component, the tone can become quite "thick" sounding as the tone tries to partially

track the modulation. This setting is the factory default.

This level of filtering offers the best compromise between response time and

Amplitude modulation (AM) filtering.

This mode provides maximum filtering of the received signal and is similar to that of

the VK3TJN/XAJ Ultra-sniffer. While this mode offers the best smoothing of

received signals it can tend to "blur" the definition of short duration pulses.

This is a special mode for use with very short duration repetitive signals such as those

emitted from wildlife or model aircraft transmitters. The transmitters used are

typically very low power and transmit for around 40 milliseconds every second or

two. The tone pitch and therefore signal direction can be very hard to determine using

the above filtering modes.

This special mode extends the time of the peak level of the received signal so that the

user can easily compare the signal level from different directions.

Holding the "4" button while powering up puts the sniffer into ARDF mode. In this

mode the sniffer will power up giving three beeps and will synchronise the ARDF

timer. For more information see the section on the Sync Button.

Holding the "5" button while powering up puts the sniffer into scan ready mode. In

this mode the sniffer gives a single beep during power up and the sync button

executes a band scan function. This is the factory default. For more information see

the section on the Sync Button.

Rev 2.2a

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