Kirisun FM540, Service Manual

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FM540 Service Manual
D1,D4
D5,D6
1SV305 TX VCO oscillation varactor
D14,D15D16,D
17
1SV305 RX VCO oscillation varactor
D19 HSC277 RX VCO output switch diode
D2 HSC277 TX VCO output switch diode
D7 HZU5ALL APC output voltage-limiting diode
D3,D37
D36
HVC131 Transmitter antenna switch diode
D27,D28,D29,D
30
1SV305 RX band pass filter varactor
D25 RB706F Commutation diode
4. Feature Description and Parameter Settings
4.1 TOT(time-out-timer)
This feature prevents the user from long occupation of the channel. If the transmitting period exceeds the
dealer’s preprogrammed time, the radio stops transmitting and rings alert tone. To stop the alert tone,
please release the PTT button. For a second transmission, please press the PTT button after a certain
period (set by the dealer). If the dealer preprograms the pre-warning feature, a warning is given when the
transmitting period gets close to its time-out-timer limit, indicating the transmission will be forbidden soon.
4.2 Channel Scan
Channel Scan is able to search for the channel where there is a signal, and the radio stays on the channel
where a signal is detected to make a conversation. The scan method is carrier control scan.
4.2.1. Carrier Control Scan
The radio scan stays on a busy channel until it is no longer busy, and the scan is enabled automatically
after a certain period (the specific period time is set by the local dealer).
Press the “Scan” shortcut key, and the radio scans the scan list of the current channel. When the radio is
scanning, you can press the “Scan” shortcut key to stop scanning.
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