PHASE 6
Band Switching Components and Connections
6-1. Install c34, 56 pF. NOTE: C34 is the only capacitor
installed for C34-C42, all of which provide for putting
capacitance in parallel with an inductor.
Install the following nine .01 μF mylar film bypass capacitors,
using whatever insertion/soldering/trimming sequence seems
most efficient to you:
6-2. C20, .01 μF mylar film capacitor, marked 103
6-3. C21, " " " "
6-4. C22, " " " "
6-5. C23, " [probably installed in Testing Step 4-2]
6-6. C24, .01 μF mylar film capacitor, marked 103
6-7. C25, " " " "
6-8. C26, " " " "
6-9. C27, " " " "
6-10. C28, " " " "
Install the following nine 1N4148 part # 28001 diodes, using
whatever insertion/soldering/trimming procedure seems most
efficient to you:
6-11. PIN diode D1, with cathode oriented per board outline.
6-12. PIN diode D2 " " "
6-13. PIN diode D3 " " "
6-14. PIN diode D4 [probably installed in Testing step 4-31]
6-15. PIN diode D5, with cathode oriented per board outline.
6-16. PIN diode D6 " " "
6-17. PIN diode D7 " " "
6-18. PIN diode D8 " " "
6-19. PIN diode D9 " " "
6-20. COIL INSTALLATION: correct installation order of
inductors L1-L9 are important to the intended tuning coverage of
your receiver. Any mistakes in the following procedure will
result in mixups in frequency band selection. The inductors
directly determine the tuning ranges of all bandswitch selections.
There is no right or wrong direction for inserting the inductors,
but a consistent pattern is helpful for double-checking your work.
i.e., orient the first two bands of all 9 coils in the same direction,
one way or the other.
1253 - 36
Install the following molded inductors per Step 6-20:
6-21. Coil L1, 68 μH, (blue-gray-black-gold)
6-22. Coil L2, 33 μH, (orange-orange-black-gold)
6-23. Coil L3, 12 μH, (brown-red-black-gold)
6-24. Coil L4, 8.2 μ1, (gray-red-gold-gold) [Done in Step 4-1)
6-25. Coil L5, 4.7 μH, (yellow-violet-gold-gold)
6-26. Coil L6, 3.3 μH, (orange-orange-gold-gold)
6-27. Coil L7, 2.2 μH, (red-red-gold-gold)
6-28. Coil L8, 1.5 μH, (brown-green-gold-gold)
6-29. Coil L9, 1.2 μH, (brown-red-gold-gold [or silver])
6-30. Solder the WHITE wires from the bandswitch board to
their corresponding positions on the receiver board:
WIRE GROUP 1-5:
6-31. Band #1, 5.25 inches
6-32. Band #2, 5.50 inches
6-33. Band #3, 5.75 inches
6-34. Band #4, 6.00 inches
6-35. Band #5, 6.25 inches
WIRE GROUP 6-9:
6-36. Band #6, 5.50 inches
6-37. Band #7, 5.75 inches
6-38. Band #8, 6.00 inches
6-39. Band #9, 6.25 inches
6-40. Double-check Diodes D1-D9 for correct orientation of
the cathode bands.
6-41 . Double-check Inductors L1-L9 for correct values.
6-42. Double-check the 9 white wires to make sure that
"Band 1" on the switch board is connected to "Band #1 " on the
receiver board, and so forth.
CABLE TIES: Study how they are made but DON'T "play" with
them. Once the pointed end of the long strip is pulled through
the rectangular slot, it can be pulled only tighter, not backed out
very easily! Replacement cable ties are a common Radio Shack™
or automotive store item.
6-43. Attach a cable tie around Wire, Group 1-5, about 1 "
from the wire for Band 5 near the switch board. Pull the tie
tight, making the beginning of a neat bundle of wires. Trim
away the excess pull-through strip.
1253 - 37
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