Specific Operations And Requirements - HYT TC-580 Service Manual

sampling. Press SK1 or SK2 after entering the above items, to activate AD sampling (including
calculation) once. Press OK to save the current AD sampling value and exit. If neither of SK1 or
SK2 is pressed, the tuning value will not be updated, and AD sampling will not be activated.
5) Description of key-press
Please refer to "Software Specifications →Description of Modes → Manual Tune Mode →
Description of key-press" on page
6) Tuning Items
TX group items: include the Preset Power, Frequency Tolerance, TX Low Power, TX High Power,
Rx Group Items: include the Squelch, RX Low Voltage Threshold, Max. RX Volume and RX

3. Specific Operations and Requirements

1) Tuning out of the mode
Note: CH1, CH2 and CH3 must be preset as wide bandwidth with low, medium and high frequency
respectively and CH4, CH5 and CH6 as narrow bandwidth with low, medium and high frequency
respectively. Make sure the antenna or load is connected before adjustment.
Tuning of TX/RX VCO Voltage
Item Condition
Set the channel to
TX CH3 and press
VCO PTT to transmit.
Lock
Set the channel to
Voltage
CH1 and press
PTT to transmit.
Rx Set the channel to
VCO CH3.
Lock
Voltage
Set the channel to
CH1.
12.
CDCSS Balance, CDCSS Deviation, CTCSS Deviation (low), CTCSS Deviation
(Medium), CTCSS Deviation (high), DTMF Deviation, TX Low Voltage
Threshold and Max. Deviation of TX Audio tuned in tuning mode via software,
and VCO Lock Voltage tuned out of the tuning mode via hardware.
Bandpass Filter tuned in tuning mode, and VCO Lock Voltage tuned out of the
tuning mode.
Test
Test Instrument
Digital
Voltmeter
Adjustment
Test point Part
Adjust TC101 with
ceramic tuning tool until
the lock voltage meets
TC101 the requirements.
Check
CV
Adjust TC102 with
ceramic tuning tool until
the lock voltage meets
TC102
the requirements.
Check
43
TC-580 Service Manual
Specifications
/ Remarks
Method
4.0V±0.2V
≥0.5V
4.0V±0.2V
≥0.5V