M2 Antenna Systems 40M1L, Руководство пользователя

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the assembly together and the other two screws and locknuts can be added anytime. String on
one cable clip and secure it near the shorting bars. Repeat for the other side of the element.
Install the shaft retainers on the 3/16” rod ends beyond the arms using the 3/8 x 3” push tube.
9. Using the two 1-1/2” U-bolts, attach the mast mounting plate to the center 1-1/4” rod insulator.
Center the plate and align it vertically. Then tighten the nuts.
10. Attach the two turnbuckles to the ‘L’ shaped turnbuckle angle plate and extend the turnbuckles
evenly until just one thread is exposed inside the body of the turnbuckle.
11. Using one 2” U-bolt, TEMPORARILY attach the turnbuckle plate to the mast mounting plate in
the top set of holes. Now, install a cable eye (thimble) in the eye of the turnbuckle. Slide two cable
clips onto the HPTG 1200 Philistran attached to the shorting bar assembly and string the cable
through the turnbuckle eye, around the thimble and back through the two of cable clips. Tighten
the cable and then secure its position with the two cable clips. Repeat for the other side. Remove
the 2” U-bolt from the mast plate but leave it attached to the turnbuckle angle plate. This part is
now ready to be mast mounted.
12. The 1:1 BALUN can be attached to the two 1/4-20 x 2” bolts near the butt of each element half
or it can be attached later at the time of installation on the mast. The BALUN normally mounts
below the dipole and is attached to the mast with the two large nylon ties supplied.
13. Attach the 3/4 x 48” element sections to the 1” sections at this time, using 8-32 x 1-1/4”
screws and locknuts. Tighten securely.
14. Now is the time to determine what frequency you want to optimize the dipole. Consult the
chart below. A nominal setting of 45” exposed 1/2” tip sections will yield a 2:1 or better match
across most of the 40 meter band with the best match occurring at approximately 7.150 MHz. This
setting was tested at 50 feet above ground. Mounting the dipole lower or very near to other
antennas or antenna booms may move the best match lower in frequency. Mounting the dipole in
the clear at heights above 50 feet will raise the frequency slightly and can affect the match.
This tuning chart
is a guide.
Surrounding
objects and height
above ground will
cause shift in
frequency. Your
results may vary.
For operation
outside the
frequency range
shown here,
please consult
with M2
Engineering.
40M1L ASSEMBLY MANUAL