| Author |
Message |
    
Turfman
New member
Username: Turfman
Post Number: 2
Registered: 6-2005
| | Posted on Sunday, June 12, 2005 - 10:02 pm: | 
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I Need help with mods for my Uniden PC 78XL want to lower (rms) dead key with full modulation swing (pep) to drive my amp.Is there any other mod for this radio? Some say its the same like the cobra 29 but its not, in side looks differant |
Patzerozero
Advanced Member
Username: Patzerozero
Post Number: 923
Registered: 7-2004
| | Posted on Sunday, June 12, 2005 - 10:59 pm: |
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pc76 is exactly as 29. 78xl modify's the same, some different color wires & PN's, but most mods are the same. |
Turfman
New member
Username: Turfman
Post Number: 3
Registered: 6-2005
| | Posted on Monday, June 13, 2005 - 1:17 pm: |
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Resisters,transistors,caps, pots all have different numbers from the cobra 29LTD.
Can a good tech, post mod or direct me where to go?
thanks! |
Couchpotatoe
Junior Member
Username: Couchpotatoe
Post Number: 12
Registered: 6-2005
| | Posted on Monday, June 13, 2005 - 10:10 pm: |
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CLIP D-11, THE FERRITE INDUCTOR IN FRONT OF THE FINAL TURN IT OUT 3 1/2 TURNS, TO TURN THE DEAD KEY DOWN YOU'LL NEED A TIP 120 DARLINGTON TRANSISTOR, 103 POTENTIOMETER, AND A 16V+ 100UF CAP. TAKE THE TIP120 FACE FORWARD THE CENTER LEG ATTACHES TO THE (+) OF THE CAP THE RIGHT SIDE OF THE TIP120 GOES TO THE (-) OF THE CAP. THERE IS A JUMPER NEXT TO THE FINAL ON THE LEFT, CLIP IT AND ATTACH THE TIP120 TO IT WITH THE (-) TOWARDS THE REAR OF THE RADIO. SOLDER A 103POT.'S CENTER LEG TO THE LEFT TAB OF THE TIP 120 THE TWO REMAINING LEGS OF THE POT ONE TO GROUND AND THE OTHER TO THE GOLD LOOKING INDUCTOR IN FRONT THE FINAL. DIAL POT FOR SPECIFIED AMOUNT OF DEAD KEY AND WILL SWING TO 20-22 WATTS |
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