Ramsey Electronics QRP-80 Instruction Manual download pdf (Page 10)

QAMP-80 • 10

We're almost finished. All we need to do now is install a few remaining parts that

have to be handmade - for that "old-world craftsmanship" touch! We'll prepare all

those parts now for further assembly. The wire used for L1, 2, and 3 is the

smaller gauge enameled wire supplied with your kit. We give you plenty, but if

you mess up, you can get a whole 50' spool of it from Radio Shack (278-1341).

 41. Winding L1 and L3 toroid RF coils (two identical units ): Locate 2 of the

donut shaped yellow toroid cores provided in the kit. Cut 20" of the

smaller size enameled magnet wire and, following the drawing, thread

the wire through the core 25 times - not 24, not 26; it MUST be 25

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

wire 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.

 42. Winding L2: Locate the remaining yellow toroid core and cut 22" of the

smaller size enameled magnet wire. Wind 28 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!

 43. Winding T2: Locate the smaller of the two 2-hole ferrite cores. Cut off

one 11 inch length of the thicker 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 whole 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

25 turns through center of core

IMPORTANT:

Loop the first winding

around the front of the

core as shown.

28 turns through center of coil

IM PORTANT:

Loop the first winding

around the front of the

core as shown.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 18 19

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Ramsey Electronics QRP-80 Instruction Manual Page 10