Kenwood TM-631A Service Manual page 25
144/220mhz fm dual bander
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Also See for TM-631A:
- Instruction manual (37 pages) ,
- Instruction manual (36 pages) ,
- Instruction manual (36 pages)
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TM-631A
DESCRIPTION
OF
ELEMENTS
220
MHz PLL Unit
(X58-3690-10)
Components
Use/Function
Operation/Condition/Compatibility
@
VCO
input
When receiving
189.175~194.170
MHz
When transmitting
220.0
~
224.995
MHz
IC1
PLL
10
At
low level when transmitting
14
At
high level
when unlocked
@)
Reference oscillator
input
12.8 MHz
Q1~2
LPF
03
Transmission select switch
Turns
ON at the
moment when transmission starts
05
Transmission select switch
Turns OFF when transmitting
When receiving
189.175~194.170
MHz
a4
VCO
output buffer
When transmitting 220
~ 224.995
MHz
Q101
VCO
When receiving
189.175~194.170
MHz
When
transmitting
220
~
224.995
MHz
When receiving
189.175~194.170
MHz
Q102
VCO
output buffer
When transmitting 220
~
224.995
MHz
Q103
Transmission select switch
Turns OFF
during transmitting
D101,
102
VCO
voltage control
24
TM-631A
DESCRIPTION
OF
ELEMENTS
220
MHz PLL Unit
(X58-3690-10)
Components
Use/Function
Operation/Condition/Compatibility
@
VCO
input
When receiving
189.175~194.170
MHz
When transmitting
220.0
~
224.995
MHz
IC1
PLL
10
At
low level when transmitting
14
At
high level
when unlocked
@)
Reference oscillator
input
12.8 MHz
Q1~2
LPF
03
Transmission select switch
Turns
ON at the
moment when transmission starts
05
Transmission select switch
Turns OFF when transmitting
When receiving
189.175~194.170
MHz
a4
VCO
output buffer
When transmitting 220
~ 224.995
MHz
Q101
VCO
When receiving
189.175~194.170
MHz
When
transmitting
220
~
224.995
MHz
When receiving
189.175~194.170
MHz
Q102
VCO
output buffer
When transmitting 220
~
224.995
MHz
Q103
Transmission select switch
Turns OFF
during transmitting
D101,
102
VCO
voltage control
24
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