Vectronics VEC-1220K - Manual (Page 20)

VEC-1220K/1230K/1240K/1280K Owner's Manual
18
This completes stage 2 construction of the VEC-1230K 30-meter kit. After
checking for errors, you may now move on to the final stage of construction.
VEC-1240K 40-Meter CW Transmitter Kit
! ! 1. Find a 47 pF multilayer capacitor (47 or 470). Install at C6 and
solder.
Find two (2) 100 pF multilayer caps (101).
! ! 2. Install 100 pF at C8 and solder.
! ! 3. Install 100 pF at C16 and solder.
! ! 4. Find a 220 pF multilayer cap (221). Install at C7 and solder.
Find three (3) 470 pF multilayer caps (471).
! ! 5. Install 470 pF at C13 and solder.
! ! 6. Install 470 pF at C19 and solder.
! ! 7. Install 470 pF at C20 and solder.
! ! 8. Find a 1000 pF multilayer cap (102). Install at C14 and solder.
Find three (3) 4.7 uH molded chokes (yellow-violet-gold-gold or silver).
! ! 9. Install a 4.7 uH choke at RFC1.
! ! 10. Install a 4.7 uH choke at RFC2.
! ! 11. Install a 4.7 uH choke at RFC3.
Locate the T37-2 toroid form, a donut-shaped part about 3/8" in diameter and
color-coded red. Also, find the #24 enameled coil wire provided with your kit.
! ! 12. Wind eighteen (18) turns of #24 wire onto the T37-2 form. Turns are
counted inside the form, and each one is pulled tight before winding
the next. When done, spread windings to distribute them over 80% of
the form's circumference.
! ! 13. Trim each lead to 1/2" tin with solder.
! ! 14. Install the coil at L1 and solder.
! ! 15. Locate the 7.040 MHz crystal (metal can, two wire leads). Install at
Y1 and solder.
This completes stage 2 construction of the VEC-1240K 40-meter kit. After
checking for errors, you may now move on to the final stage of construction.
VEC-1280K 80-Meter CW Transmitter Kit