Hy-Gain RRK-88 Manuale utente
308 Industrial Park Road
Starkville, MS 39759 USA Ph:
(662) 323-9538 FAX: (662) 323-6551
RRK-88
Roof Radial System
for DX 88 Vertical Antenna
INSTRUCTION MANUAL
General Information
This radial kit consists of four sets of resonant
radial wire assemblies totalling 14 radials for 7
bands, 40 through 10 meters. The DX-88
antenna will also work on the 80 meter band
using this radial kit. Each radial is made from
7/23 Copperweld®, and is attached to the
antenna base with solder lu
g
s.
Installation
Second, install the support mast within the
tripod. The support mast should be 15/8 inch
O.D. by approximately 3 feet long (41mm x
lm
)
steel or heav
y
-wall aluminum.
Install your OMNI DX-88 vertical antenna to
your support mast. Tune the antenna to the
desired frequencies before installation by
following the example or graphs in your DX-
88 manual. Attach a ground wire as shown in
Figure 1, Detail A, and tighten the two U-bolts
securel
y
.
The OMNI DX-88 vertical, when mounted on
a roof or mast, should be mounted in the clear
awa
y
from trees and
p
ower lines.
Do not install this antenna near any power line.
Not only is it dangerous to put up and take
down, the power lines could cause excessive
noise to be received by the radio connected to
this antenna.
Also, do not attach other antennas or antenna
supports to this antenna or to its resonant radial
s
y
stem.
Attach the insulators to each free end of the
radial wires. Fold back the free end of the
radial wire and lightly twist together. DO NOT
CUT OFF EXCESS WIRE UNTIL YOU ARE
SURE ALL BANDS ARE WORKING
PROPERLY. Adjust the wire lengths to those
shown in Table 1.
Cut the 5/32 inch polyethelyne rope into
lengths appropriate for your installation. The
supplied length of 100 feet will make 14
sections each 7 feet long. Insert these rope
sections through the insulators and tie.
WARNING
Installation of this product near power
lines is dangerous!! For your safety,
follow the installation directions.
Attach each of the 4 wire assemblies to the
bottom of the antenna base, using the No. 10
bolts installed on the base. Ti
g
hten securel
y
.
First, obtain a short sturdy tripod, such as a
Radio Shack® 3 foot tripod, and attach it to
your roof using 1/4 inch or 5/16 inch lag
screws (not supplied). The lag screws should
be screwed into the roof joist where possible,
or you should add a reinforcing board under
the roofin
g
p
l
y
wood for
g
reater stren
g
th.
Copperweld® is a registered trademark of Copperweld Bimetallic
Group
Radio Shack® is a registered trademark of the Tandy corporation
Table 1 Resonant Radial
Lengths
Figure 1 Roof Mounted
Radial System
A
O
-1
555
-
0O
2
0
Figure 2 DX-88 Resonant
Radial System
Arrange the radials as shown in Figure 2.
Attach the hook screws to your roof and tie
each rope section to each hook loosely. Allow
extra rope at each location for fine-tuning of
each radial wire length. Waterproof the point
where each hook screw and lag screw enters
the roof with RTV.
The resonant radials must be at least 10 feet
from tower guy wires, mast guy wires or any
other wires or metal objects. Use the shortest
path possible between the antenna and an 8
foot ground rod for the earth ground, using #6
or #8 copper wire. Mast mounting is identical
to roof mounting.
WARNING
Keep this antenna away from the reach of
children or pets. When transmitting, the
antenna and antenna radials are hot with
RF proportional to the operating power.
If you mount your antenna on a roof and find
the roof space is to small for the radial system,
you can droop the radials over the edge of the
roof at almost any angle without seriously
changing the performance of the antenna. The
radial system must be insulated from the roof
and connected to a good ground for lightning
protection.
In any installation, use a good quality 50 ohm
coaxial transmission line such as Times RG-
213/u (solid), Belden 8214 (foam) or Belden
8237, 8267, or 9251 (solid).
Take extra care when soldering connectors to
foam dielectric coaxial cable. Weatherproof
all connectors which will be exposed to rain or
ice with Coax-Seal® or another similar
substance.
Attach the transmission line to the bottom of
the base assembly and tighten securely. Tape
the coax to the tripod for strain relief when
roof mounting.
Coax-Seal® is a registered trademark of Universal Electronics,
O
p
eration
Connect the other end of your transmission
line to a good quality SWR meter and then to
your transmitter. While using low power (less
than 200 watts output) check the VSWR across
each band from 3.5 to 29.7 MHz.
Radial wires for the 80 meter band may be
added if
y
ou have enou
g
h room.
Refer to the OMNI-DX-88 vertical antenna
instruction manual for information on tuning
and operating this antenna system.
If the frequency of lowest VSWR is within
approximately 300 KHz of where it should be,
(according to the tuning graphs), you may fine-
tune your antenna by adjusting the lengths of
the appropriate radial wires. Shorten the two
radial wires on each band to raise the resonant
frequency, or lengthen the two radial wires to
lower the resonant frequency. When each band
has been adjusted, tightly attach the rope
sections to the hook screws.
Parts List
Item
No. Part No. Description Qty
1 878571 Radial Assembly, 40/30/17 Meter
2
2 878572 Radial Assembl
y
, 20/15/12/10 Meter
3 691136 Ro
p
e
,
5/32" Pol
y
x 100
878573 Parts Pack, RRK-88
4 460318 Radial
5 547275 Screw
Indice
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