5
ASSEMBLY
assembly points in the same direction as the "L"-shaped clamp at the bottom of coil support tube 30
meter (O). Tighten the upper clamp around the insulator and set the completed coil support tube 30
meter (O)/coil/capacitor assembly 30 meter (P) assembly aside.
24. From the middle of the center clamp of coil assembly 80/40 meter (C), measure downward to a point
that is 13" (33cm) along the lower tube B2 w/insulator (B2). Mark this point and stretch the 80
meter, larger coil until the lower edge of the bottom clamp is even with the mark. Tighten the wing
nut to secure the clamp at this point.
25. From the middle of the center clamp of coil assembly 80/40 meter (C), measure upward to a point 9
3/8" (24cm) along the upper tube (B3). Mark this point and stretch the 40 meter, smaller coil until
the upper edge of the upper clamp is even with the mark. Tighten the wing nut to secure the clamp at
this point.
26. Take up the assembled 30 meter unit, coil support tube 30 meter (O)/coil/capacitor assembly 30
meter (P) and position the remaining upper clamp of this unit around the tube (B3) so that the L-
bracket clamp from the lower end of coil support tube 30 meter (O) is even with the fourth turn,
counting from the top down on the 40 meter coil. Use a split lockwasher and a hex nut to tighten this
clamp a slight amount.
27. Hook the L-bracket clamp from coil support tube 30 meter (O) around the fourth turn of the 40 meter
coil and use small #8 hardware to tighten the clamp securely around the coil. Adjust the position of
the 30 meter unit along tube (B3) to avoid distorting the 40 meter coil. Tighten securely.
28. From the upper edge of the upper coil clamp on the coil/capacitor assembly 30 meter (P)/coil support
tube 30 meter (O) measure downward to a point 9 7/8" (25cm) along coil support tube 30 meter (O)
and mark this point with a pencil. Stretch the 30 meter coil until the lower edge of the lower clamp is
even with this mark. Tighten the wing nut to secure the clamp at this setting. This completes the
preliminary adjustment of the 80, 40 and 30 meter coils. Refer to the pictorial page.
29. Install the coax 75 ohm matching line (R) on tube A w/insulator (A) and tube B1 section (B1) as
shown in the pictorial. Simply place the lugs over the ends of the #8 bolts at this time. The center
conductor connects to tube B1 section (B1), the braid to tube A w/insulator (A).
30. Place #8 flat washers over the lugs and install coil Q base matching (Q) as shown. Point 1 should go
to section (B), point 2 to tube A w/insulator (A) and point 3 to any ground rod or other earth
connection. Secure the connection to tube A w/insulator (A) and tube B1 section (B1) with flat
washers, lockwashers and hex nuts. Radials or additional grounding may be attached to the
connection on tube A w/insulator (A) with the remaining #8 hardware.
31. MAKE SURE THAT THE STATION EQUIPMENT IS CONNECTED TO A GOOD EARTH
GROUND! DO NOT HANDLE ANY CABLE CONNECTED TO STATION EQUIPMENT
WITHOUT FIRST DISCONNECTING THE EQUIPMENT FROM THE POWER MAINS. YOU
COULD BE ELECTROCUTED!
32. Connect coax 75 ohm matching line (R) to any length of 50-53 ohm coaxial cable. A PL-258 "barrel"
connector (S) is provided. A small roll of weatherproof sealing tape has been provided. This may be
used to seal the outside of the RF connectors that join the coax 75 ohm matching line (R) to the
transmission line.
CHECKOUT AND ADJUSTMENT
The dimensions and coil settings given above should produce reasonably low VSWR readings over the
entire 10, 15, 20 and 30 meter bands and over at least 250 kHz of the 40 meter band. Bandwidth on
80/75 meters should be at least 30 kHz for VSWR of 2:1 or less, depending on the efficiency of the
