Service manual

Service Manual SD170E Series
Page 13 of 44
Features
16 Channels
The SD-170E Series radio can store up to 16 channels within the same band. These channels
can be selected by inner DIP-S/W or serial command inputted from external control system.
Channel Spacing
The SD-170E Series is capable of programmable channel spacing, in both UHF and VHF bands.
Each channel can be programmed via the PC programmer, ACC-916E, having 12.5 kHz or 25
kHz channel spacing.
Output Power
Each channel can be programmed via the PC programmer to a high-power output, 5 Watts, and a
low-power output, 1 Watt.
Channel Scan
For audio application, SD-170E Series supports channel scan enabled via serial commands.
During programming of the radio, any channel can be selected as a scanned channel. When a
scanned channel is selected, it becomes a part of the scan list. Once the scan list has been
established, initiates scan by serial commands. If a conversation is detected on any of the
channels in the scan list, the radio will stop on that channel and audio signal will be released
through pin 9 of the DB-15 connector. At that moment, busy channel data is sent to external
equipment or device through serial command. So, busy channel data can be identified as
decoding received serial command from radio in the external equipment or device. Normally, if
user tries to transmit during scanning, the transmission will be made on the channel that the call is
received during the programmable scan delay time. (The scan delay time is the amount of time
the radio will stay on that channel once working has ceased. Dealer programming of 4 ~ 7
seconds is typical). The radio will resume scanning once the scan delay time has passed, and will
continue to scan until the serial command for scan stop is inputted by external equipment. After
the scan has resumed, if a transmission is made, the radio will transmit on the selected priority
channel. This feature is similar to priority scan TX except for selection of priority channel. You can
assign a priority channel by inner dip switch only.
Scan Delete
To temporarily delete a channel from the scan list, simply input the serial command for scan
deletion to the radio while scanning and stopped on the channel to be deleted. This will
temporarily remove that channel from the scan list until the scan is closed or the radio‟s power is
reset.
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