Antenna; Grounding; Equipment Interconnections - QRO Technologies HF-2500DX Instruction Manual

house wiring circuit, as the ratings of the wire will almost certainly be exceeded. Avoid excessively
long runs of wire between your service entrance and the Amplifier. A heavy flow of current in such
a line results in a voltage drop which can affect the performance of your equipment. No plug is
supplied with the line cord. Use a plug that matches your 240 VAC receptacle (NEMA 6-15P or
6-20P). Your power connection must conform to section 210-21 (b) of the National Electric Code,
which reads, in part:
"Receptacles connected to circuits having different voltage, frequencies, or types of current (AC
or DC) on the same premises shall be of such circuits are not interchangeable."
When you install a new plug, make sure it is connected according to your local electrical code.
Keep in mind that the green line cord wire is connected to the Amplifier chassis.

ANTENNA

The output circuit of the Amplifier is designed to be connected to an unbalanced transmission line
that has a 50 ohm characteristic impedance. Lines of other characteristic impedance may be used
providing the SWR (standing-wave-ratio) does not exceed 2:1.
The RF OUT connector is a UHF type SO-239. You will need a mating PL-259 plug for your
transmission line.
Use coaxial cables like RG-8U, RF-11U, or similar types, for the transmission line. Due to the
power level, the smaller types RG-58U and RG59/U are not recommended.
The "A.R.R.L. Antenna Book" is readily available and includes comprehensive reference work on
transmission lines and antennas. Other similar handbooks for the radio amateur are offered for
sale and can often be found in a public library.

GROUNDING

Connect a good earth or water pipe ground to the ground post on the rear of the Amplifier. Use
the heaviest and shortest connection possible. Before you use a water pipe ground, inspect the
connections around your water meter and make sure that no plastic or rubber hose connections
are used. These connections interrupt the continuity to the water supply line. Install a jumper
around any insulating water connectors you may find. Use heavy copper wire and pipe clamps.
It is best to ground all equipment to one point at the operating position and then ground this point
as described above.

EQUIPMENT INTERCONNECTIONS

Interconnection between the Amplifier and a typical transceiver is shown in the "Interconnection
Diagram" located inside your transceiver owners manual. Many brands of equipment usually
follow the same general pattern. Please refer to this diagram plus the amplifier's Rear Panel
Pictorial while reading the following:
RF IN Connect this socket to the RF output connector of your transceiver.
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