Yaesu FRG-100 Technical Supplement - Circuit Description

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.

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 Supplement