Zares ZTrak, Руководство пользователя

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Page 12
TX & RX Adjustments
Transmit Adjustment
The TX trimpot sets ZTrak transmit audio level. Setting the
proper audio level is critical to ensure you do not over
modulate the transmitted signal or cause clipping in the
transmitters audio circuit to occur. Either can adversely
effect the received signal performance. There are two ways
you can set the TX level:
1.
Dev iation meter connected to transceiver - set
the TX level for +/- 3Khz maximum deviation.
2.
Listening to the signal on another radio - turn the
level up slowly until the signal doesn’t get any louder, and
then turn it back down until it gets noticeably quieter.
Continue turning it down for about 1/8 turn after that point.
Receive Adjustment
The ZTrak does not decode incoming packet data, it detects
audio / carrier energy (voice, data, or static). This avoids
doubling or transmitting over the top of other stations. The
sensitivity of the detection circuit is determined by the RX
trimpot.
•
Adjust the squelch on the receiver so that it remains
closed under average channel conditions with no signals
present.
•
Turn RX trimpot all the way up so that the LED remains
lit (or flashes very fast), then turn it back down until it stops
blinking under quiet channel conditions.
LED Indicator
The LED indicator of the ZTrak indicates processor activity.
•
Rapid Blinking – indicates a signal (or carrier) on the
audio input port has been detected. This could be because
another station is transmitting, the squelch level is set too
low or the receive adjustment has been set wrong.
•
Slow Blinking – occurs when ZTrak is connected to a
1-wire wind instrument and is receiving 1-wire data.
•
Repeated series of flashes – the ZTrak is receiving
valid NMEA data from the GPS receiver which has received
GPS lock. The actual series of flashes will depend on the
type of GPS receiver used.
•
Repeated double flashes – the ZTrak is receiving valid
NMEA data from a GPS receiver that has not acquired GPS
lock. This may be because the GPS is just warning up and
in the process of acquiring enough satellites to get a positive
lock or the GPS antenna is not able to receive satellite data.
•
Lit solid – indicates the ZTrak is transmitting an APRS
packet or is connected to a PC and is in configuration mode.