Yaesu FTV-901R, Instruction Manual

Page: 20 / 42

430 MHz UNIT
The incoming signal is fed through RL1301 to the
two stage RF amplifier, consisting of Qi201 and
Qi 202
(2SC2369),
and then passed through a
selective filter to the doubly balanced diode mixer,
Diso3 - D1so6
(1SS43)
where the incoming signal
is mixed with a
402-410
MHz local signal,
producing a
28-30
MHz output signal which is
fed to the
10
M OUTPUT jack.
The local signal is generated at
67-68
MHz by
oscillator Qi6oi
(2SC784R),
then multiplied by
Qi602 and Q15oi
(2SC1424).
The local signal at
402-410
MHz is then passed through a selective
filter to buffer Qi so2
(2SC1424
), for delivery to
the mixer.
For transmission, the output from the transceiver
is delivered to the diode ring mixer, where it is
heterodyned with the local oscillator signal,
resulting in a signal of
430-440
MHz . The signal is
then fed through a selective filter, which
effectively eliminates spurious responses. The
signal is then amplified by Q1203
(2SC1424
), fed
through another selective filter, then amplified by
the amplifier chain, consisting of Qi4oi
(2SC1424),
Q1402
(2SC1426),
Qi403
(2SC1426),
and final
amplifier Qi3oi
(UP-07BL).
The output signal
from Qi 3oi is fed through a stripline filter, via
RLi 301, to the ANT jack.
A portion of the output from Li 306 is detected by
Di302
(1S188FM)
and fed to the base of Qi2os
(2SC1815Y),
for control of the bias applied to
Q13oi. Qi204
(2SC1815Y)
acts as a switch for the
automatic final protection circuit. A further
portion of the output signal is rectified by Di 303
(1S188FM)
and fed to the meter, providing
indication of relative power output.
The supply voltage is regulated at
8
volts by
Qi6o3
(78L08).
70Cm UNIT(PB-1929,1930,1931,1932,1933,1934 1935)
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01202
2SC2369
RF
AMP
0120!
2SC2369
RF AMP
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01502
2SCl424
8UFF
01501
01602
2SCl424 2SCl424
x
2
x3
430-430MHz
432-434MHz
434-436MHz
436-438MHz
438-440MHz
01601
2SC784R
67.000MHz
67.333MHz r
67.666MHz
68.00IOMl1z
68.333MHz
L
_______ _ __ _ _____ ___ __ _______
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