Foxhunt VK3YNG Sniffer 4 Instruction Manual - Page 8

Browse online or download pdf Instruction Manual for Receiver Foxhunt VK3YNG Sniffer 4. Foxhunt VK3YNG Sniffer 4 15 pages.

Print Page

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

Sync Button

This facility is used to synchronise the receiver for use in international style (ARDF)

foxhunting for a one-minute cycle, five-transmitter system.

In ARDF mode this timer is automatically synchronized when the receiver is switched

on. Three short beeps are generated as confirmation of this mode.

Pressing the Sync button re-synchronises this timer. Three short beeps are given to

confirm this button has been pressed. The sync button should be pressed at the start of

transmitter one's cycle.

At 50 seconds into the cycle, the sniffer will generate three short beeps giving 10

seconds warning that the current transmitter's cycle is about to end. If the sniffer is

currently receiving at range 1 or lower, at four seconds before the completion of the

current transmitter cycle the sniffer broadcasts a number of beeps corresponding to

the number of the transmitter in the cycle which is about to commence. The pitch of

these beeps is set slightly lower than the "50-second" beeps. The display also briefly

flashes the number of the next transmitter.

When ARDF mode is not selected, the "7" key performs a basic band scan operation

where the sniffer hunts for the highest signal between the two frequencies stored in

channel locations 5 and 6. The highest signal found is stored in channel 4. The scan

will ignore any signals within approximately 10KHz of the frequency stored for

channel 1 and the signal must be detectable at range 2 or higher to be stored.

This operation takes some time to complete, especially if there is large frequency

difference between channels 5 and 6. The scan function works best for continuous

signals and may not properly detect intermittent transmissions. Channel 5 must be

lower in frequency than channel 6 and both frequencies must be within the same band

(i.e. 120MHz or 140MHz)

In ARDF mode, if a range down delay (d-Set) of zero is selected and the sniffer is not

currently configured for manual ranging, the sniffer will automatically select range

zero at the start of the next transmitters' cycle regardless of the current signal

strength.

Holding the "7" key during power-up cancels the Low RSSI Tone mode and the

Reduced Key Functionality mode. In this mode the signal strength tones function

normally and the maximum signal strength pitch is 8KHz. This mode is set as the

factory default.

This key is disabled in reduced functionality mode.

Rev 2.2a

Page 8