Kenwood TM-V7A Service Manual

TM-V7A/E
42
ADJUSTMENT
Measuring Equipment for Adjustment
1. Digital voltmeter (D.V.M)
Input impedance: High
2. RF valve voltmeter (RF V.M)
input impedance: 1MQ or more, 2 pF or jess
Voltage range: Full scale = 10mV to 300V
Measurable frequency range: up to 450MHz
3. Frequency counter (f. counter)
Input sensitivity: About 50mV
Measurable frequency: 450MHz or more
4. DC power supply
Voltage: Variable in the range 10 to 17V
Current: 13A or more
5. Power meter
Measurement power: GOW, SOW, 10W
Impedance: 500
Measurable frequency: 450MHz
6. AF vaive voltmeter (AF V.M)
Input impedance: 1MQ or more
Voltage range: Full scale = 1mV to 30 V
Measurable frequency range: 50Hz to 10kHz
7. AF generator (AG)
Output frequency: 100Hz to 10kHz
Output voltage: 0.5mV to 1V
8. Line detector
Measurable frequency: 450MHz
9. Spectrum analyzer
Measurable frequency: 450MHz
10. Directional coupler
11. Oscilloscope
High sensitivity with horizontal input terminal
12. Standard signal generator (SSG)
The standard signal generator must be able to generate
the 1GHz band frequencies and vary the amplitude and
frequency. —
Output: -133dBm to greater than -13dBm
13. Dummy load (for AF)
8Q, about 5W
14. Noise generator
The noise generator must be able to generate noise
similar to ignition noise containing high-frequency
components of 450MHz or more.
15. Sweep generator
The sweep generator must be able to sweep the 144
and 430MHz bands.
16. Tracking generator
17. Adjustment jig
Preparation
@ Set the controls and switches to the positions listed
below unless otherwise specified.
VOL control Fully counterclockwise
SQL control Fully counterclockwise
POWER switch OFF
(For fixed stations) _ OFF
DC power supply POWER switch
Cann
UP DWN
8c : DC 8V R.D : Transmission band
100mMA max. detection output (100mV/ 10k Q)
GND MIC
STBY (PTT) GND (MIC)
Microphone socket
(as viewed from the front of the set)
@ Use an insulated rod, such as a plastic rod, for
adjustment (especially for trimmers, coils, etc.).
@ To protect the signal generator, never connect the
microphone to the microphone socket when the
receiver section is adjusted.
Before the power cord is connected, make sure the
power switch is off.
Without specification of SSG, standard modulation is
applied (MOD : 1kHz, DEV : +3kHz, AF output :
0.63V /8Q)
@ See the instruction manual for transmit and receive
operations.

Kenwood TM-V7A Specifications

General Specifications

VHF frequency range	144~148MHz
UHF frequency range	438~450MHz (U.S.A/Canada)
Antenna impedance	50Ω
Usable temperature range	-20°C to +60°C (-4°F to +140°F)
Power supply	13.8V DC ±15% (11.7~15.8V)
Grounding method	Negative-ground
Frequency stability	±3ppm (-10°C to +50°C)
Dimensions (W x H x D)	140 x 54.5 x 205.5 mm

Transmitter Specifications

High power output	50W (VHF) / 35W (UHF)
Mid power output	Approx. 10W
Low power output	Approx. 5W
Spurious emissions	-60dB or less
Maximum frequency deviation	±5kHz
Audio distortion	3% or less (at 60% modulation)
Microphone impedance	600Ω

Receiver Specifications

Circuitry	Double conversion
Intermediate frequency (1st / 2nd)	38.85MHz / 450kHz and 45.05MHz / 455kHz
Sensitivity (VHF or UHF band)	0.16μV or less (12dB SINAD)
Sensitivity (Sub VHF or UHF band)	0.25μV or less
Selectivity (-6dB)	12kHz or more
Selectivity (-60dB)	28kHz or less
Squelch sensitivity	0.1μV or less
Audio output	2W or higher (8 ohms, 5% distortion)
Audio output impedance	8Ω

Weight and Dimensions

Weight	1.2 kg (2.6 lb)
Dimensions (W x H x D)	5.51" x 2.15" x 8.09"