Roberts Radio U-75R - Manual

© 1997, 2000 Tandy Corporation.
All Rights Reserved.
RadioShack and RadioShack.com are trademarks used by Tandy Corporation.
OWNER’S MANUAL — Please read before using this equipment.
U-75R UHF Antenna
BEFORE YOU BEGIN
Before you begin installation, read this manual and the sepa-
rate Consumer Product Safety Commission information sheet.
For your safety and convenience, plan each step of the installa-
tion and purchase the necessary hardware in advance. The
hardware required and the order in which you perform the steps
depend on the mounting and connection method you choose.
Warning: When you install your antenna, use extreme caution.
If the antenna starts to fall, let it go! It could contact overhead
power lines. If the antenna touches the power line, contact with
the antenna, mast, cable, or guy wires can cause electrocution
and death. Call the power company to remove the antenna.
Do
not attempt to remove it yourself.
ASSEMBLING THE ANTENNA
Assemble the entire antenna on the ground.
1. Use the supplied hardware to loosely attach the supplied
mast clamp assembly to the main boom, as shown.
Note: To access the mast clamp holes, move the antenna’s
elements out of the way as needed.
2. Press the supplied large end plugs into the main boom.
CONNECTING LEAD-IN CABLE
TO THE ANTENNA
We recommend RG-6 cable and, if you prepare your own ca-
ble, a quality F-connector. You can also use 300-ohm flat, twin-
lead cable. (RadioShack carries a variety of suitable cables and
connectors.)
Note: If you prepare your own coaxial cable, be sure to slide
the supplied matching transformer’s weather boot onto the ca-
ble before you attach the F-connector.
Using Coaxial Cable
If you plan to add this antenna to a VHF antenna’s mast, refer
to “Adding the UHF Antenna to a VHF Antenna Installation” on
Page 2 for instructions. This type of setup requires twin-lead
cable. See “Using Twin-Lead Cable” to connect the cable to
your antenna. If you are connecting this UHF antenna directly
to your TV, follow these steps to make this connection using
coaxial cable.
1. Thread a matching transformer’s spade terminals through
the antenna’s strain-relief tab. (Matching transformers are
available at your local RadioShack store.)
2. Slide the spade terminals around the antenna’s lead-in ter-
minals (on both sides of the boom), then secure them with
the supplied flat washers and large wing nuts.
3. Screw the cable’s F-connector onto the matching trans-
former.
4. Slip the weather boot over the connection. If you use a
rebuilt cable without a weather boot, cover the connection
with weather-resistant tape.
Using Twin-Lead Cable
To connect flat, twin-lead cable to your antenna:
1. Split one end of the twin-lead cable for a length of about 3
inches. Then strip about 1 / 2 inch of insulation from both
leads.
2. Thread the stripped leads through the antenna’s strain-
relief tab.
U-Bolt
Mast Clamp
Backup Plate
Main Boom
Lock Nuts
Lead-In
Terminals
Weather Boot
F-Connector
Matching
Transformer
Strain-Relief Tab
Flat Washers
Large
Wing Nuts
Spade
Terminals
Main
Boom
Lead-In Terminals
Strain-Relief Tab
Twin-Lead Cable
Flat Washers Large
Wing Nuts
Main
Boom
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