Kenwood TM-221A Service Manual page 34

COMMON ADJUSTMENT
Condition
M-221A/E/ES
CIRCUIT DESCRIPTION
Measurement Adjustment
Test |
Unit |Terminal! Unit
equipment
Part
Specification/Remarks
Method
1) Power supply : 13.8V DC
Power SW : OFF
VOL VR: Fully counter
clockwise (CCW)
SOL VR: Fully counter
clockwise (CCW)
VR6 on TX-RX unit :
Fully counter clock-
wise (CCW)
2, Reset
ing the VFO/M and M.IN
SW down.
2) Release the VFO/M and
M.IN SW.
1) Turn the power SW ON, hoid-
Display 145.000
Mien
iJ; appeared during 5 sec.
Min
then, | &) disappeared.
[ieee
1) RX VCO
FREQ, : 145.020
Receive.
2) TX VCO
FREQ, : 145.020
Transmit.
Digital
volt-
meter
£0.1V
1) FREQ. : 146.000 (K,M)
145,020 {T,W)
Transmit.
RECEIVER SYSTEM ADJUSTMENT
Condition
f.counter
Power
meter
Test
equipment
146,000MHz (K,M)
145,020MHz (T,W)
Adjustment
Specification/Remarks
Method
1) FREQ. : 146.020 (KM)
145.040 (TW)
1. Helical
2) Connect the spectrum ana-
lyzer to the TP1 terminal.
from the TX-RX unit.
jt
3) Connect the TP3 terminal to
GND terminal.
Connect the sweep gen. to the
ANT terminal and the Oscillo-
scope to the detector output.
Oscillo-
scope
Oscilloscope or
Spectrum
01,2: 1SS99
L3(3E)
(TW)
Adjust for the wave-
) |form perform shown
on right.
K,M T,W
144 145 146
1) FREQ. : 147.500MHz
SSG output : 126.170MHz
MOD : OFF
Output : GOdBu
Digital
multi-
meter
TP2
(4D)
TX-RX eta
(3F) |
144 148
MAX.
1) FREQ. : 146.020 (K,M)
145.040 (T,W)
SSG output : 5dBy
MOD : OFF
Digital
multi-
meter
TX-RX [uae
L5(4E)
L7(4E)
Check : Accurate SSG's Repeat for MIN.
Repeat the adjustment |freq.
in order of L5 and L7,
1) FREQ. : 146.020 (K,M)
145.040 (T,W)
SSG output : 20dBu
MOD : 1kHz
DEV : +5kHz
36
AF VM
Oscillo-
L9(4E)
lun i MAX,
(4D)