Ramsey Electronics QAMP20 manual

ˆ41. Winding L1 and L3 toroid RF coils (two identical units ): Locate 2 of the donut shaped yellow toroid cores provided in the kit. Cut 8" of the enameled magnet wire and, following the drawing, thread the wire through the core 12 times - not 11, not 13; it MUST be 12 times through the core, pulling each turn gently tight. Winding too tightly runs the risk of scraping off the enamel insulation and shorting the wire. Tin each end with solder by holding your soldering iron and solder the ends until the insulation melts away and the copper wire underneath coats nicely with solder. Tin all the way up to the toroid core body.

ˆ42. Winding L2: Locate the remaining yellow toroid core and cut 9½" of enameled magnet wire. Wind 14 turns through the core using the same procedure as above. Tin the wire ends as before. Mark this part with a piece of tape, a dab of paint or a magic marker. We don't want to confuse it with the other two toroid coils wound just before!

12 turns through center of core

IMPORTANT: Loop the first winding around the front of the

core as shown.

ˆ43. Winding T2: Locate the smaller of the two 2-hole ferrite cores. Cut off one 11 inch length of enameled magnet wire and thread the wire through the core 6 times, pulling each turn gently tight. That's 6 times through each hole, resulting in 6 complete turns through the core. Be especially careful not to strip the insulation by pulling too tightly around the core. The amount of wire cut for this task is the proper amount. If you have too little or too much, you haven’t wound the core correctly. Tin each end with solder as before. Tin all the way up to the core body. This winding is the primary of transformer T2.

ˆ44. Cut off another length of the same wire, 8 inches long. Wind 1 turn through the core, loop out 1 inch, twist together and run one more turn

14 turns through center of core

IMPORTANT: Loop the first winding around the front of the core as shown.

QAMP20 • 10