Circuit Description - Kenwood TM-D700A Service Manual
144/430mhz fm dual bander
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Also See for TM-D700A:
- Instruction manual (99 pages) ,
- Instruction manual (55 pages) ,
- Operation instruction manual (20 pages)
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TM-D700A/E
CIRCUIT DESCRIPTION
1.Frequency configuration
The TM-D700 has an individual VCO and PLL unit for both
VHF and UHF bands. Using these separate VCO and PLL
circuit, it can receive 2 separate bands at the same time. Also,
you can perform the full-duplex operation.
The UHF VCO is used for the following functions:
(i) UHF transmission
(ii) The first local oscillator for the main band(UHF) reception.
(ii)The first local
oscillator
for the sub
band(VHF)
reception(halved).
The VHF VCO is used for the following functions:
(i) VHF transmission
(ii) The first local oscillator for the main band(VHF) reception.
(iii) The
first
local
oscillator
for the
sub
band(UHF)
The PLL reference frequency is generated by a 12.8MHz
crystal oscillator connected to the VHF and UHF PLL ICs. This
reference frequency is used for both PLL circuits.
The second local oscillator for the VHF band uses the tripled
reception(doubled).
12.8MHz reference oscillator frequency. The 45.05MHz
second local oscillator for the UHF band is generated by the IF
IC crystal oscillator circuit.
ANT
MIC
H
A
y—
MIC AMP
[5
PLL 1
VCO 1
|
,
UHF TX
ly
1/2
G
ltst iF
TNC
AF
| 45.0SMHz
MAIN
B
UHF RX
[|
I
osc
;
—L
T
c
SUB
Cc
Crystal
Crystal
VHF AX
[774
TT
12.8MHz
45.505MHz
Crystal
|
12.8MHz
128MHz
k
D
AQKY
ose
PLL 2
vco 2
I
VHF TX |
J
2nd IF
xe
SP
v7
450kHz
list iF
AF
|
|38.85MHz
MAIN
AF AMP
T]
DET
IF2
|
t
E
VHF RX
[774
|
es
Ge
L
Lt
xs
38.4MHz
FE
susp
|_|
UHF RX
A}
K | 438.000~449.995MHz
D|
K | 144.000~147.995MHz
{Gj
K | 392.950~404.945MHz
K | 182.850~186.85
MHz
E | 430.000~439.995MHz
E | 144.000~145.995MHz
E | 384.950~394.945MHz
E | 182.850~184.815
MHz
M4 | 430.000~439.995MHz
M4 | 144.000~145.995MHz
M4 | 384.950~394.945MHz
M4 | 182.850~184.815
MHz
B|
K | 438.000~439.995MHz
E!
K | 144.000~147.995MHz
H | K_ j 378.100~386.090MHz
K | 199.575~205.572
5MHz
E | 430,000~439.995MHz
E | 144.000~145.995MHz
E_ {| 378.100~382.090MHz
E | 195.575~200.512
SMHz
M4 | 430.000~439.995MHz
M4 | 144.000~145.995MHz
M4 | 378.100~382.090MHz
M4 | 195.575~200.572
5MHz
C | K | 144.000~147.995MHz
F | K | 438.000~449.995MHz
||
K_|
4189.050~193.045MHz
K_ | 399.150~411.1450MHz
E | 144.000~145.995MHz
E | 430.000~439.995MHz
E | 189.050~191.045MHz
E | 391.150~401.115
MHz
M4}
144.000~145.995MHz
M4 | 430.000~439.995MHz
M4 | 189.050~191.045MHz
M4 | 391.150~401.145
MHz
Fig.1 Frequency configuration
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