Kenwood TK-880 Service Manual page 52

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.
"H HPOW 256" E
"H2 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 470.100MHz±100Hz E
419.100MHz±100Hz E3
± 0.5W
26.0W
± 1.0W
25.0W
Set "H HPOW 250" ± 1.0W E
if you cannot adjust +1.0W, –5.0W E3
the output power to
25W for E3 type.
± 0.5W
6.0W
Check 25W±1W, 8A or less
25W+1W, –5W (E3 CH3 - Sig1)
Make the de- (Wide 5k/Wide 4k/Narrow)
modulation
waveform near.
TK-880
Specifications/Remarks
51