TC-508 Service Manual
9
The Status Indicator solidly glows red when adjusting items CH1 to CH9.
RX Group Items: CH10-CH13 stand for SQL Normal On, SQL Normal Off, RX Low Voltage Threshold
and RX Bandpass Adjustment.
Green LED solidly glows when adjusting items CH10 to CH13.
CH14 to CH16 are unavailable and LED will go out.
4) To switch between wide and narrow bandwidth
Under a tuning item, long press PTT key to toggle between narrow band and wide band. After this
operation, the first frequency of current bandwidth is the frequency for adjustment by default.
5) To switch frequency
Short press PTT (the Status Indicator flashes green indicating valid press) to switch among different
frequencies orderly under certain bandwidth and certain adjustment item.
6) To add/subtract adjustment value
Short press SK1 under certain bandwidth and certain adjustment item to increase the adjustment value
in step of 1; hold down the key to increase the value continuously in step of 1. The adjustment value will
remain unchanged once it reaches the allowed maximum value.
Short press SK2 under certain bandwidth and certain adjustment item to decrease the adjustment value
in step of 1; hold down the key to decrease the value continuously in step of 1. The adjustment value will
remain unchanged once it reaches the allowed minimum value.
7) Operations of special items:
TX group items: CH8 represents TX Low Voltage Threshold. These adjustment items are related to AD
sampling. Press SK1 or SK2 after entering the above items, to activate AD sampling
(including calculation) once. Rotate the Channel Selector knob to save the current AD
sampling value.
Rx Group Items: CH10-CH12 stand for SQL Normal On, SQL Normal Off and Rx Low Voltage
Threshold. These tuning items are related to AD sampling. Press SK1 or SK2 after entering
the above items, to activate AD sampling (including calculation) once. Rotate the Channel
Selector knob to save the current AD sampling value.
8) Description of key-press:
Short press: key press no longer than 1 second;
Long press: key press time longer than 1 second.
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