Yaesu FRG-100, Техническое дополнение

Страница: 13 / 79

Circuit Description
filtered before by Q2019
and then applied to the mixer of the
main loop Q2012 as a sub-loop
Although the reference frequency of the
main loop is 81.92 kHz, a 10 Hz receiving
frequency step is obtained by mixing a
loop with the main loop. The VCO is
thus to the reference Signal.
Miscellaneous Con
Band selection for the PLL Loop 1
is provided from the CPU by
Q2005 and driver
Whenever either VCO Loop
and line (from pin 8
of Q2030) by
nals the CPU, then
audio and blinks the display until the
resume
The MPU provides band selection on
the Main Unit via
and selection using switching
gates and
Rotary encoded tuning data from the main
dial is by dial
and transferred to the MPU via an
S-bit data bus. contains a real-time
with reference oscillator crystal.
00
Supplement