PRO 510,520XL | CUT D14 | Adjust L6,L5,L4 for max RF output |
PC66XL | CUT D9 | Adjust L10,L9,L8 for max RF output |
PC76XL | CUT D11 | Adjust L17,,L20,L21,L16{Some Models},L14 for max RF output |
PC122 | Adjust VR5 | AM Power VR10 SSB Power VR11 |
GRANT XL & MADISON{UNIDEN 8719PLL} | CUT TR24 or R131 | Tune L37,L38 for max RF output |
GRANTDX EXPORT | CUT TR32 | AM Power VR13,SSB Power VR12 |
ZACHARY T.(2816 pll) | VR6 or cut D16 | Adjust L13,L12,L11 for max RF output |
WASHINGTON (858 pll) | VR7 or cut D23 | AM Power VR8, SSB Power CT7, TX Coils L32,L30,L29,L28 |
WASHINGTON{MB8719} | CUT TR32 | AM Power VR6, SSB Power VR7, VR1 "S"Meter, VR2 Squelch, VR3 TX Freq, VR12 Mod Meter, VR10 TX Power Meter |
WASHINGTON{MB8719} | CUT TR32 Change R99 to a 2.2k resistor Change R94 to a 2.2k resistor Adjust L36,L37 for max RF output AM Power VR6 SSB Power VR7 VR1 "S"Meter VR2 Squelch VR3 TX Freq VR12 Mod Meter VR10 TX Power Meter |
ZACHARY T(2816 pll) | VR6 or cut D16 Remove C128 (.47uF). Remove TR16. Replace R132 (1k) with a 470 Ohm. Replace R50 (3.9 Ohm) with a 1 Ohm. Re-tune coils L13,L12,L11 for maximum forward power output. Jumper C61 with a 67pF capacitor. Replace TR10 (2SC2029) with a 2SC1969 then tune L16,L17 and spread L14 For even power across band. Remove D13 and replace with a jumper. |
GRANT XL & MADISON{UNIDEN} | CUT TR24 Change R126 to a 2.2k resistor Change R124 to a 2.2k resistor Tune L37,L38 for max RF output |
PC76XL | Change stock final to a 2SC1969 Change stock driver to a 2SC1957,{some model use a 2SC2028 rf driver}Remove it Change R123 to a 0.47 ohm resistor Change R58 to a 2.7 ohm resistor Put a jumper across D8{by audio transformer} Change C71 to a 33uf 16volt polarized electrolytic capacitor Put a 47pf disc cap across C57 Put a 47pf disc cap across R55 For a higher dead key place a 100pf disc cap across C62{by rf driver} Key radio and say HEEELLLOOOOOO while adjusting L17,L20,L121,L16,L14 Some models dead key 8-10 watts swing 40-50PEP VR1 rx gain VR2 rx signal meter VR3 squelch VR4 AMC VR5 tx power meter VR6 antenna warning light |
PC66XL | CUT D9 Change R76 to a 1k resistor Change R43 to a 2.7 ohm resistor Change R108 to a .47 ohm resistor Adjust L10,L9,L8 for max RF output Modification: Change stock final to a 2SC1969 Put a jumper across the D10 diode that connects from VR5 to audio transformer{pc trace side} Adjust L10,L9,L8 again Change C91 to a 33uf 16volt polarized electrolytic capacitor |