Kenwood TH-25A Instruction Manual page 15
144/430/440/1200mhz
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Also See for TH-25A:
- Service manual (73 pages) ,
- Instruction manual (24 pages) ,
- Instruction manual (23 pages)
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The schematic for the TH-25AT shows:
TH-25A
M,M2
TH-25A
M3,M4,X
TH-25AT
K
TH-25AT
M,M2
TH-25E
T
TH-25E
W
And the schematic for the TH-45AT shows:
TH-45A
M1,M2,X
TH-45A
M3,M4
TH-45AT
K
TH-45AT
M1,M2
TH-45AT
M3,M4
TH-45E
T
TH-45E
W
where O means USED, and X means NOT USED.
On the TH-25AT:
(All frequencies given in MHz.)
R22 in
R28 out
This is how the radio is delivered in the USA. TX 144-1, 141-163
(I think).
R22 out
R28 in
The radio tunes from 142-151. This may be the modification given to US MARS members. I don't
remember where the unit will transmit. It may or may not transmit outside the range from 144-148.
R22 in
R28 in
The radio tunes only from 144-148.
R22 out
R28 out
Frequencies may be selected from 100-200 MHz (on the display only - your PLL will not lock up in this
entire range). In addition, TX is possible where your PLL locks up.
R25 out
Removing R25 disables automatic offset selection.
R23 and R24 are used for selecting the step size for tuning. I can't remember which positions are for which
R18-R21
R25
-12
O
X
-23
O
X
-11
O
O
-12
O
X
-52
X
X
-62
X
O
R19-R21
R22
-21
O
O
-22
O
X
-10
O
X
-21
O
O
-22
O
X
-51
X
O
-61
X
O
R26,27
R28
R36
X
X
X
X
O
X
X
X
X
X
X
X
O
O
O
O
O
O
R23
R25
R26,27
O
X
X
O
X
X
O
X
X
O
X
X
O
X
X
X
X
O
X
O
O
Page 3
R28
R36
O
X
X
X
O
X
O
X
X
X
X
O
O
O
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