Crystal Calculations - Yaesu FT-2FB Instruction Manual

The output from the RE amplifier is then coupled
to the first mixer Q102, 2SC784R.
The first mixer converts the RF signal into a 10.7
MHz intermediate frequency.
The output of the heterdyne oscillator 0108, 25С-
712D is amplified by the buffer stage Q109, 2SC-
712D, and then coupled to a tripler D108, 151555
and multiplied. The frequency relationship is as
follows :
Signal Frequency -10.7
Xtal Frequency(MHz)= 9
The local oscillator injection signal is 10.7 MHz
lower than the signal received.
The first IF (10.7 MHz) signal is fed to a first
IF amplifier 0103, 25С784 К, through a crystal
filter, and amplified and then applied to a second
mixer 0104, 2SC712D.
The second heterodyne signal of 11.155 MHz is
generated by Q110, 2SC712D, and then fed to the
second mixer to produce the 455 kHz second IF
signal.
The 455 kHz second IF signal is amplified by
Q105, 2SC712D, through the ceramic-mechanical
filter. This filter determines the bandwidth and
selectivity of the receiver.
The signal is then applied to limiter amplifier Q107,
TA7061AP integrated circuit. The limiter is designed
so that input signal variations in amplitude produce
no change in the amplitude of the output signal.
The output from the limiter is applied to the dis-
criminator where the FM signal is converted to the
audio signal which is then fed {о the audio amplifier
Q111, AN212 integrated circuit. The amplifier de-
livers 2.5 watts maximum output to the speaker.
potentiometer on the front panel.
CRYSTAL CALCULATIONS
Transmit :
Xtal Frequency(MHz)= A (rf)
Receive :
Signal Frequency -10.7
<<...
Xtal Frequency = 9
MHz)
Accessory Socket Connection
Pin 1 Ground
Pin 2 NC
Pin 3 Discriminator output
Pin 4 Ground
Pin 5 Ground
Pin 6 DC +12V
Pin 7 DC +12V
Pin 8 DC +12V through power switch
Pin 9 PTT switch
For remote PTT operation, connect a switch
between Pin 1 and Pin 9.