Yaesu FT-208R, Руководство по техническому обслуживанию

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SERVICING
FREQUENCY RANGE MODIFICATIONS
This modification will enable your transceiver to
operate within the frequency range and with the
channel spacing required for use in your particular
area. Please refer to the diagram and chart below
for details.
PB-22058 (Viewed
from
Solder Side)
Prod.L.Dts
1 - 6 ( Ser.Nos 01XXXX- 06XXXXI
X201
TYPE YAESU PN. FREQUENCY
A , D, E , F HOI02408
HC- 18T 5.76MHz
B , C HOI02409
II
7. 2MHz
PB-2337 (�iewed from Solder side)
Prod.Lot
7 &
UP<s.,Nos.07XXXXl
X202
TYPE
YAESU PN .
FREQUENCY
A,D,E
HOI02403 H
C
-
1 8
T
1 25.595 MHz
B,C
H0102405
//
1 24.5875MHz ,
HOI02404
//
1 2 6.095MHz
FREQUENCY RANGE MODIFICATION
Type A Type B
Type C Type D TypeE
BAND (MHz)
144.0 - 14 7.995 144.0 - 145.9875 144.0-147.9875 144. 0 - 147.995 144.0- 147.995
PRESET (MHz)
147.0 145.0 145.0 145.0 147.0
CH.STEP (Hz)
5k/ 10k 12.5k/25k
12.5k/25k
5k /10k 5k/10k
JP-I
0
0
I
0
x
0
JP-2
x 0 0 x x
JP-3/ R314
0 x 0 0 0
JP-4
x x
x
x x
R314
x x x
x
x
R315
x x x
x x
NOTE :
1 .
"O"
in the above table indicates that a jumper wire (or resistor) should be installed.
TypeF
144.0 - 145.99 �
145.0
10k/20k
x
x
0
Carbon film
Carbon film
2. Some models use a resistor between the points indicated in this connection, while other models use
simply a jumper wire (JP-3)
3. Type A transceivers can have their range extended to 143.5 - 1 48.495 MHz by removing jumper JP-3 .
4. Except for R3 1 4 (if used), all jumper wires and R3 1 5 are located on the component side of the board.
MO D I F I C AT I O N S
3- 1 8
MODIFICATION OF THE FT-208R FOR
1 WATT OUTPUT IN THE LOW POWER
POSITION
Although the specification for LOW power output
from the FT-208 R is 0.3 watt, with this modifica­
tion the LOW power output will be approximately
1 watt.
Parts needed : one 1 8 ohm, 2 watt metallic film
resistor with insulating sleeve over
the body of the resistor.
1 . Connect the 1 8 ohm resistor between the
HI/LOW switch terminal to which the brown
wire is connected and the point on the pattern
of the Main Unit circuit board shown in the
drawing. Leave the brown wire connected as
before. This completes the modification.
0
WW
SOI
0
-----PS-2276
1
H I /LO
I
I
I
I
I
0
::i: (f)
18il2W