5. Insert (2) 8-32 x 1/4” set screws into each remaining SPLICE BLOCK. Slide a splice block 1/2” on the open
ends of each of the rods just installed and tighten the set screw.
Now insert two more 3/16” x 72” rods per side into these SPLICE BLOCKS and tighten the set screws.
6. Slide another 3/16” x 72” rod through the white insulators on the 3 arms beyond the dual support arm. In-
sert the inner rod end into splice block at the dual support arm and tighten set screw. Now slide the sec-
ond 72” rod in through the white insulators and connect it at the spice block as before. SEE THE FRE-
QUENCY CHART on the LINEAR LOADED ELEMENT ASSEMBLY DRAWING and select the desired
center frequency for Element #1. Cut this outer linear loading rod to the desired dimension. Position the
outermost linear loading arm about 6” from tip. Space the other arms to support the rod at equal intervals.
Then tighten all clamp screws. Repeat for other element half.
7. Next, pre-assemble both pair of LINEAR LOADING SHORTING BARS using (5) 8-32 x 7/8” screws and
locknuts. NOTE: THE BARS ARE NOT SYMMETRICAL IN THE CENTER GROOVES. Now pass about 4”
of HPTG-1200 through the CENTER groove and back through the offset grooves so you have about 2-1/2
inches of cable end coming back for later clamping. Using a tape measure, mark each rod at the “A” Dim.
back from where it attaches to the DUAL SUPPORT ARM. Slide a shorting bar set onto the rod ends and
position the shorting bar clamps at your “A” Dim. marks. Level the bars; equalize the rod tension and begin
tightening the outer screws. Once everything is straight and aligned, tighten all 5 screws. Repeat for the
other side.
NOTE: IF YOU WILL BE USING THIS ANTENNA FOR OPERATION BELOW 6.950 MHZ, THEN DO NOT
TRIM OFF THE EXCESS ROD BEYOND THE SHORTING BAR. CONSULT THE TUNING CHART FOR
THE PROPER SHORTING BAR SETTING AND THEN TRIM OFF EXCESS 5” BEYOND THE SHORT-
ING BARS.
IF OPERATION IS DESIRED ABOVE 6.950 MHZ, THEN CUT THE EXCESS ROD MATERIAL OFF AT 5”
BEYOND THE SHORTING BARS.
EXCESS ROD MUST BE TRIMMED AS DESCRIBED ABOVE OR RESONANCE MAY BE
LOWER.
8. Cut the 30 ft. phillystran into to equal length and route through the element support clamps and pull tight.
(see the self locking method shown in the assembly details diagram). Route the other end of the cable
through the thimble and upper turnbuckles and wire clips and pull tight and tighten the clips, equally ten-
sion the cables using the turnbuckle. To check your tension, lift the element up at the center and note the
element droop. Each element should droop 10” to 16” at the tip.
9. Now route the linear loading phillystran through the lower turn buckles and thimbles and add the wire clips.
Pull the cable though and tighten the wire clips. Use the turnbuckles to tension them just to slightly help
the main element supports. Use 1/4-20 nuts provided to jam the turnbuckle.
10. We have provided a new coil section to go across the rear element which is different from some earlier
coils. If this coil is different from your original, replace the original with this new coil.
FINAL CHECK ALL
HARDWARE FOR TIGHTNESS.
THIS COMPLETES THE ASSEMBLY PROCESS.
NOTE:
When mounting this log periodic on a tower or mast with other antennas there may be interaction par-
ticularly if any of the other antennas are resonant in the 7 AND 10 to 30 MHz band. In general VHF and/or
UHF antennas mounted for HORIZONTAL POLARITY should be at least 40 inches above or below the log
antenna. Use good quality 50 Ohm feed line to feed the log and be sure your tower and rotator system can
handle to wind area and weight of this antenna. We want you to enjoy operating the SEVEN AMATEUR
BANDS that this antenna covers not to mention all the other possible applications for this versatile performer!
ASSEMBLY INSTRUCTIONS
