Kenwood TM-V7A Service Manual

TM-V7A/E
CIRCUIT DESCRIPTION
@144MHz band PLL synthesizer section
The VCO section is in the shielding case and the PLL comparison with the reference frequencies obtained by
section is on the TX-RX board. The 12.8MHz reference frequency dividing X2. For VHF-band reception, oscillation
oscillator (X1) is oscillated with the PLL IC (iC7). The 5kHz is 182.85 to 184.845MHz (E), 182.85 to 186.845MHz (K, M)
and 6.25kHz reference frequencies are obtained by and for transmission, oscillation is 144.00 to 145.995MHz
frequency dividing this signal. Part of the 12.8MHz (E), 144.00 to 147.995MHz (K, M). For UHF-band sub-
oscillation output is also supplied to the 4830MHz PLL circuit reception, oscillation is 195.575 to 200.5725 MHz (M, &),
through a buffer amp. 199.575 to 205.5725MHz (K) using double the VCO
5kHz, 10kHz, 15kHz, 20kHz, 12.5kHz, 25kHz, and oscillation frequency as the local frequency.
50kHz step PLL synthesizers are configured through phase
VGO(IC12:KCH27)
“4 144,0~ 147.995 MHz (KM)
ov HT nq 144.0~ 145.995 MHz ( E)
PLL(IC7) MAIN
ATeaaIGr) 280 182.85 ~ 186.845 MHz (K,M)
aan 4738(GR){ | MB1511PFV-GBND}|—{ 4619 Bape 4-845 M2 (E})
(P.Q 195.575~200.5725 MHz (M,E)
AMP 499.575~205.5725 MHz (K)
TT 12.8M
IC6 10pin
Fig.18
@430MHz band PLL synthesizer section
The VCO section is in the shielding case and the PLL For UHF band reception, oscillation is 384.95 to
section is on the TX-RX board. 5kHz, 10kHz, 15kHz, 394.945MHz (M, E), 392.95 to 404.945MHz (K) and for
20kHz, 12.5kHz, 25kHz, and 50kHz step PLL synthesizers transmission, oscillation is 430 to 439.995MHz (M, &),
are configured through phase comparison with the 438.00 to 449.995MHz (K). For VHF-band sub-reception,
reference frequencies obtained by frequency dividing the oscillation is 378.1 to 382.09MHz (E), 378.1 to 386.09MHz
12.8MHz signal supplied from the 144MHz band PLL circuit. (K, M) using double the VCO oscillation frequency as the
local frequency.
VCO(IC10:KCH28)
438~ 449.995 MHz (K)
cv HT ' r—k 430~ 439.995 MHz (ME)
, S02 35 404.945 MHz (K)
. I~ . iz
PLL(IC6)
SS
384.95~394.945
MHz
(M,E)
SUB
3SC47a8\GR) |1MB1511PFV-GBND|-{ 4619 378.1 ~382.09 MHz (E)
(P.Q) 378.1 ~386.09 MHz ( K,M )
12.8M(1C7:MB1511PFV-GBND)
Fig.19
18

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"