TC-320 Service Manual
8
by user’s misoperations. )
Keep this option unchecked after values are well adjusted from factory, to avoid any unexpected change of values. The
adjustment values can be reset and changed in Factory Mode only.
Description of adjustment:
1) To enter Manual Adjust Mode
Hold down PTT, SK and Power On/Off Key until the radio is turned on and orange LED glows, the radio will enter Adjust
Mode. When the keys are released, the radio will enter item N of Tx group (N depends on the position where the Channel
Selector Knob locates). Red LED glows for adjustment of Tx group items and green LED glows for adjustment of Rx
group items.
2) To switch between Tx group and Rx group
This operation is done through the Channel Selector Knob.
Red LED solidly glows when adjusting items in Tx group.
Green LED solidly glows when adjusting items in Rx group.
3) To switch between items of Tx group/Rx group
This operation is done through the Channel Selector Knob.
Tx group: CH1 to CH9 stand for Tx Low Power, Tx High Power, CDCSS Balance, CDCSS Deviation, CTCSS Deviation
(low), CTCSS Deviation (medium), CTCSS Deviation (high), Tx Low Voltage Threshold and Max. Deviation of Tx Audio
respectively.
Red LED solidly glows when adjusting items CH1 to CH9.
Rx group: CH10 to CH12 stand for SQL On 5, SQL Off 5, and Rx Low Voltage Threshold respectively.
Green LED solidly glows when adjusting items CH10 to CH12.
CH13 to CH16 are invalid and carry no adjustment item.
4) To switch between wide and narrow bandwidth
When adjusting a certain item, short press SK (orange LED flashes indicating valid press) to switch between wide/narrow
bandwidth. After this operation, the first frequency of current bandwidth is the frequency for adjustment by default.
5) To switch frequency
Short press (no longer than 1 second) PTT (green LED flashes indicating valid press) to switch frequency one by one,
under certain bandwidth and certain adjustment item.
6) To add/subtract adjustment value
Short press [+] under certain bandwidth and certain tuning item, and the adjustment value will increase in steps of 1; hold
down [+], and the adjustment value will keep increasing in steps of 1. The adjustment value will remain unchanged once it
reaches the allowed maximum value.
Short press [-] under certain bandwidth and certain tuning item, and the adjustment value will decrease in steps of 1; hold
down [-], and the adjustment value will keep decreasing in steps of 1. The adjustment value will remain unchanged once it
reaches the allowed minimum value.
7) Measures on special items:
Tx group: CH8 is the Tx Low Voltage Threshold. This adjustment item is related to AD sampling. Press [+] or [-] after
entering the above item, to activate AD sampling (including calculation) once. Rotate the Channel Selector Knob to save
the current AD sampling value. If [+] and [-] are not pressed, neither the adjustment value will be updated, nor will AD
sampling be activated.
Rx group: CH10 to CH12 stand for SQL On 5, SQL Off 5, and Rx Low Voltage Threshold respectively. These adjustment
items are related to AD sampling. Press [+] or [-] 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 [+]and [-] are not pressed,
neither the adjustment value will be updated, nor will AD sampling be activated.
8) Description of key press:
Short press: key press no longer than 1 second; Long press: key press time longer than 1 second.
