Kenwood TK-780 Service Manual page 51

Transmitter Section
Item Condition
1. Frequency 1) Set test mode
Select "FREQ" in tuning mode. F. counter panel
PTT : ON
2. Power 1) Maximum power
output Set test mode
Select "HPOW" in tuning mode.
"L HPOW 256" E
"L HPOW 250" E3
PTT : ON
3. High power 1) Set test mode
Select "HPOW" in tuning mode.
"L HPOW"
PTT : ON
2) "L2 HPOW"
PTT : ON
3) "C HPOW"
PTT : ON
4) "H2 HPOW"
PTT : ON
5) "H HPOW"
PTT : ON
4. Low power 1) Set test mode
Select "LPOW" in tuning mode.
"L LPOW"
PTT : ON
2) "L2 LPOW"
PTT : ON
3) "C LPOW"
PTT : ON
4) "H2 LPOW"
PTT : ON
5) "H LPOW"
PTT : ON
5. Power check 1) Set test mode
CH : CH1 - Sig1
CH2 - Sig1
CH3 - Sig1
PTT : ON
6. Modulation 1) Set test mode
balance MIC input : OFF
Select "BAL" in tuning mode. meter
"nL BAL"
Deviation meter filter
LPF : 15kHz
HPF : OFF
De-emphasis : OFF
2) "nC BAL"
PTT : ON
3) "nH BAL"
PTT : ON
4) "s BAL"
PTT : ON
5) "w BAL"
PTT : ON
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
Power meter Rear ANT
TX-RX VR1
(A/2)
Power meter
Power meter ANT
Ammeter DC IN
Power meter Rear ANT
Deviation panel
Oscilloscope
AF VTVM Front MIC
AG panel
Adjustment
Parts Method
Check 160.100MHz±100Hz
± 0.5W E
27.0W E
± 0.2W E3
5.0W E3
± 1.0W E
25.0W E
± 0.2W E3
5.0W E3
± 0.5W E
6.0W E
± 0.1W E3
1.0W E3
Check 25W±1W, 8A or less E
5W± 0.2W, 5A or less E3
Make the de- (Wide/Semi-wide/Narrow)
modulation
waveform near.
TK-780
Specifications/Remarks
51