Formac 700 Information

[ButtFuzz]

for fishingshow:

1. 4:24 PM - ButtFuzz:
   Formac 700: <VR3 next to R145 is FM Dev, VR1-TX Meter, VR3-Lo AMC, VR4-Mid PWR AMC, VR5-Hi AMC,
2. 4:24 PM - ButtFuzz:
   VR6-Mid PWR, VR7-Low PWR, VR8-Sq Range, VR9-RX Meter>
3. 4:24 PM - ButtFuzz:
   TX Tune-up: LT8, LT7, LT6, LT5, (LT4, LT3, LT2 - careful - glued)
4. 4:24 PM - ButtFuzz:
   RX Tune-up: LT12, LT13, LT14, LT15, LT16, LT17
5. 4:25 PM - ButtFuzz:
   Disclaimer: Never been inside one. YMMV. You break it, you broke it.
6. 4:27 PM - ButtFuzz:
   Uses Sanyo LC7120 PLL
7. 4:28 PM - ButtFuzz:
   One of the later BCD/ROM chips now finding its way into European rigs. The programming, IFS, and T/R pins use internal pull-down resistors. Chip uses 5 KHz divider steps.
8. 4:28 PM - ButtFuzz:
   LD1 is active LOW; LD2 is active HIGH. Several N-Code sets are possible depending upon AM or SSB use and choice of IF, very similar to mPD2810.
9. 4:28 PM - ButtFuzz:
   Examples for AM circuits: For 10.695 MHz IF, N-codes are 182 to 270 (RX) and 273 to 361 (TX); For 9.785 MHz IF, N-codes are 364-452 (RX) and 273 to 361 (TX).
10. 4:28 PM - ButtFuzz:
    Notice the 455 KHz may shift up or down on TX relative to whether the IF is operating above or below the 10.24 MHz mixing signal.
11. 4:28 PM - ButtFuzz:
    For SSB use, the T/R and ½R pins are not used; Instead a separate crystal oscillator provides the loop mixing.
12. 4:29 PM - ButtFuzz:
    Most SSB chassis using this chip or the mPD858 (and some with MC145106 or mPD2824) have identical main chassis;
13. 4:29 PM - ButtFuzz:
    the PLL chip is the only difference and all are designed for straight 91 to 135 N-code division.

LC7120
(Sanyo)

P1 1 20 Vss
P2 2 19 AO
P3 3 18 AI
P4 4 17 PD
P5 5 16 LD1
P6 6 15 LD2
IFS* 7 14 Fin
T/R** 8 13 1/2R
Vdd 9 12 RB
RI 10 11 RO
*1=10.695 MHz IF, 0=9.785 MHz IF
**R=1, T=0