HYT TC-618, Service Manual

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TC-618/626 Service Manual
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group. If the LED glows red, Tx group is entered; if the LED glows green, Rx group is entered.
The LED solidly glows red for adjustment of Tx group items.
The LED solidly glows green for adjustment of Rx group items.
3) To switch between items of Tx group/Rx group
This operation is done through the Channel Selector knob.
Tx group: CH1~Ch15 respectively stand for Tx Preset Power, Tx Low Power, Tx Medium Power, Tx
High Power, CDCSS Deviation, CTCSS Deviation (low), CTCSS Deviation (medium),
CTCSS Deviation (high), MSK Deviation, VOX Level 1, VOX Level 2, VOX Level 3, VOX
Level 4, VOX Level 5 and Tx Low Voltage Threshold. (Note: Tx Medium Power is not
required to be adjusted and can be skipped. For radios without the ATIS function, MSK
Deviation is not required to be adjusted and can be skipped. )
The LED solidly glows red during adjustment of CH1~CH15.
Rx group: CH1~CH8 respectively stand for SQL On 1, SQL On 5, SQL On 9, SQL Off 1, SQL Off 5,
SQL Off 9, Rx Low Voltage Threshold and Rx Bandpass Filter.
The LED solidly glows green during adjustment of CH1~CH8.
CH9~CH15 are invalid, and the green LED goes out when the Channel Selector knob
locates on one of these channels.
4) To switch between wide and narrow bandwidth
When adjusting a certain item, long press PTT (orange LED flashes indicating valid press) to switch
between wide/narrow bandwidth. And the first frequency of the current bandwidth is the frequency
for adjustment by default.
5) To switch between frequencies
Short press PTT (orange LED flashes indicating valid press) to switch between frequencies orderly
under certain bandwidth and certain adjustment item.
6) To adjust the value
Short press SK1 under certain bandwidth and certain adjustment item to increase the adjustment
value in steps of 1; hold down the key to increase the value continuously in steps 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 steps of 1; hold down the key to decrease the value continuously in steps of 1. The
adjustment value will remain unchanged once it reaches the allowed minimum value.
7) Measures on special items:
Tx group: CH10~CH15 respectively stand for VOX Level 1, VOX Level 2, VOX Level 3, VOX Level 4,
VOX Level 5 and 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. If neither of SK1 or SK2 is pressed, the adjustment value will not be
updated, and AD sampling will not be activated.