Kenwood TM-731A Service Manual page 56

TM-731A/E
56
ADJUSTMENT
| Measurement Adjustment
Item Condition Test | Specification/Remarks
equip-
ment Unit {Terminat) Unit Part Method
3-1, DEV FREQ. 144.975 MHz (W} Linear Rear {| ANT? | TX-RX | VR3_ | +4.6 kHz leither + or ~ | +200 Hz There should be no
146.000 MHz {K,M,P) detector (144) | (144) value which is larger) abnormal within detecting
AG 1 kHz, 28 mV (W) Dummy range.
50 mV (K,M,P} {50 ohms) Linear detector condition:
Make transmission. Divider LPF: OFF
Oscil- HPF: 20 kHz
lascope Deemphasis: OFF
3-2. MIC GAIN | AG 1 kHz 2.8 mV (W) +2.4 kHz~ +3.6 kHz
5 mV (K,M,P) Check above
Make transmission.
4. Protection FREQ. 144.975 MHz (W) Ammeter Final VR3 | 5.5 A t0.2A
(CURRENT) 146.000 MHz (K,M,P) (144)
ANT open
Make transmission.
5. TONE FREQ. 145.100 MHz (K,M,P) Linear ANT f: BB~ 89 Hz LPF: 3 kHz
Make transmission. detector, (144) DEV.: +0.5~1 kHz HPF: 20 kHz
Dummy Linear detector condition | Deemphasis: OFF
FREQ. 145.100 MHz (W) load (50 £1780 Hz +10 Hz
Make transmission. ohms) DEV, +2.5 kHz or more
Tone push (W)
430 MHz Receiver Adjustments
Measurement Adjustment qT
Item Condition Test Specification/Remarks
equip-
_. — ST ment | Unit |Terminal) Unit |" Part" | Method
1. BPF FREQ. 435.050 (M,W) Tracking ANT1 | TX-RX | TC1,2 |The specified range :
{430 MHz) 445.050 (K,P) generator (430) L3,4 | should be secured with (
(440 MHz) Connect a sweep generator or track- or the GAIN set to MAX po- |
ing generator to ANT1 (430 MHz, | Sweep sition.
ANT terminal). generator |
wonnect ren analyzer to the Spectrum| TX-RX | TP1
test point
: analyzer | (430)
430 440
(438) (450) (K,M).
2. Receiving FREQ. 435.040 MHz (M,W} Tester | TX-RX | TP2 | TX-RX | L8, 9 | MAX.
sensitivity 445.050 MHz (K,P} (430) (430) '
SSG 0 dBu
MOD : OFF
3. Dis- FREQ. 435.040 MHz (M,W) Oscillo- | Rear EXT. | TX-RX L11 MAX,
criminator 445.050 MHz (K,P] scope | panel SP {430}
a SSG 0 dBp Millivolt-
meter "ee
4. Squeich FREQ. 435.040 MHz (M,W} Oscillo- EXT. | TX-RX | VR1_ | Set to the position where
(tight 445.050 MHz {K,P) scope SP {430) noise is not heard,
squeich) MAIN SQL. MAX. Mitivolt-
SSG ~6 dBu meter
SSG ~4 dBu Squeich open
SSG OFF 8:00 ~ 9:30
Rotate SQL to set to the position
where noise is not heard.
S-meter FREQ. 435.040 MHz (M,W) SSG Rear | ANT1 | TX-RX | VR2 | Set to $1.
445.050 MHz {K,P} SP pane! {S-meter; {430}
SSG ~4 dBy Front
panel
SSG 25 dBu All LED light up.
Sensitivity FREQ. 435.040 MHz (M,W) Oscillo- SP 12 dB SINAD or more
445.050 MHz {K,P)" scope
SSG ~9 dBu Millivett-
Set the band edge in the same way. meter
FREQ. 430.040 MH27}_ ny wy Distortion
439.940 MHz+(M. meter
438.940 MHz
449.940 MHz (K.P)