Pro Antennas Dual Beam Pro User manual

Dual Beam Pro
Rotatable
Multi-Band
HF Antenna
Pro Antennas ©2021
Assembly Instructions
Dual Beam Pro
Assembly Instructions
Thank you for purchasing this unique antenna product. We
hope that it will provide you with many hours of operation and
pleasure for years to come.!
Please take a little time to carefully follow the instructions and
study the pictures to help understand the correct positioning
and alignment of the various components.!
Contents
The packing tube should contain:!
2 x 1 inch diameter alloy 2.5m main element sections!
complete with end caps and capacity hat securing bolts!
2 x 3/8 inch diameter alloy 2.5m capacity hat elements!
1 x GRP rod centre support insulator!
The small box should contain:!
1 x matching transformer with mounting block!
2 x cable ties!
2 x matching transformer connection leads!
1 x galvanised mast head support clamp!
4 x 35mm M6 bolts with serrated nuts!
4 x capacity hat element end caps!
1 x self amalgamating tape for sealing the cable connector!
Tools required
10mm and 13mm spanners!
Safety
GRP/aluminium splinters can cause skin irritation and
protective gloves must be worn before handling.!
Ensure you have a safe working area of at least 5m x 3m.!
Abide by the Work at Height Regulations for installation.
1

Specification
The Dual Beam Pro is a non-resonant horizontal dipole antenna
with capacity loading end elements. Aerospace alloy is used for
the elements and the fasteners and clamps are galvanised for
excellent corrosion resistance.
Overall span of main rotatable element!
Overall span of end elements!
Turning radius required!
Total weight including clamp and transformer!
Support mast diameter range!
Maximum peak envelope power 20m - 6m!
Maximum peak envelope power 40m & 30m
5.0m!
2.5m!
2.6m!
4.0kg!
32 - 50mm!
1000W!
600W
This antenna requires an ATU to minimise the reflected power.
For 40m and 30m operation, the ATU built into most modern
HF transceivers is unlikely to have a sufficient matching range
and an external ATU will be required.
Alignment
The Dual Beam Pro may be mounted on a mast rotator or pre-
aligned in the preferred directions of coverage. The diagram
below shows the antenna aligned to beam maximum energy
East and West.
Note: this diagram is
indicative and is not a
plot of the radiation
pattern
2
Assembly
1. Insert the GRP rod through the section of the mast head
support clamp but do not tighten the clamp at this point.
2. Fit the main elements onto
the ends of the GRP rod and
align the bolt holes. Ensure
that the capacity hat securing
bolts are facing upwards
before inserting the 4 x 35mm
bolts and fitting the serrated
nuts to the 2 outermost bolts.
3. Fit the 2 connection
leads to the matching
transformer and offer up
the assembly to the 2
innermost bolts. Fit the
serrated nuts finger tight.
4. Slide a capacity hat element
through the hole in the outer
end of a main element section.
Centralise the capacity hat
element using the alignment
marks and tighten the
securing bolt by no more than
1/2 turn.
Fit the plastic end caps and repeat step 4 for the other capacity
hat element.
3

5
Form a small loop prior to taping the coax cable to the support
mast using PVC insulating tape. If you are using a rotator,
ensure there is enough slack in the cable to allow the mast to
rotate without restriction.
Finally, check that all the
main element bolts,
matching transformer
connection lead nuts
cable ties are tight.!
Your Dual Beam Pro is
now ready for use.
Alignment
The antenna should now be aligned to give maximum coverage
in the desired directions before fully tightening the mast head
clamp bolts.
Connection
Lift the antenna onto the
support mast and tighten
the cable tie(s) to secure the
matching transformer to the
mast.!
Ensure that the mast head
clamp is still central on the
GRP rod and that the
capacity hat elements are
horizontally aligned before
finger tightening the mast
head clamp bolts.
Your co-axial cable can
now be fitted to the
matching transformer with
a PL259 connector. Seal
the connector against
moisture using the self
amalgamating tape.
Remove the backing layer
and wrap the tape tightly
from the socket to the plug.
Installation
4
Slide the cable tie through the slot between the mounting block
and the transformer housing. The second cable tie can be used
for extra security or kept as a spare.