ATR-20 Instruction Manual
Ameritron Antenna Tuner
3
The
ANTENNA SELECTOR
selects one of 3 rear panel SO-239 coaxial connectors or the wire-type
wing-nut connections. Of the three rear panel coaxial connectors, only
COAX 1
and
COAX 2
connectors are available using the matching network in the tuner.
COAX 3
is bypass only, with no
tuning functions available. Single wire or balanced wire outputs are available only as tuned antennas.
2.0 INSTALLATION
CAUTION: To prevent RF burns from high voltages when using open wire
or single wire feeds, locate the tuner to prevent rear panel
connections from being accessible during operation. Be sure
the tuner is properly grounded.
1.
A power source must be connected for the power meter to operate. There are two choices:
a.
Connect a 12 Vdc power source to the back of the tuner marked 12 VDC. This method will also
supply power to the meter and turns-counter lamps.
b.
Remove the small bottom cover from the tuner and connect a standard 9 volt battery to the battery
clip. Snap the battery into the metal holder, and replace the battery cover. When a 9 volt battery is
used as the only power source, meter and turns-counter lamps will not function.
2.
Locate the tuner in a convenient location at the operating position. If random wire or balanced lines
are used, the rear panel ceramic feed-throughs may operate with high RF voltages. These voltages can
cause serious RF burns if contact is made with ceramic standoff terminals while transmitting.
Locate
the tuner where the wire feedline terminals can not be contacted during operation.
3.
Install the tuner between the transmitter and the desired antennas. Use good quality coaxial cable
(such as RG-8/U) to connect the transmitter (or amplifier) to the rear panel connector marked
“
TRANSMITTER”
.
4.
Connect the antenna(s) to the tuner as follows:
a.
Coaxial feedlines that might require use of the tuner connect to coax connectors 1 and 2. Coaxial
cables not requiring a tuner connect to coax connector 3.
b.
Single wire feedline antennas should be connected to the
WIRE
connector on the back of the
unit.
c.
Balanced feedlines (open wire, twinlead, or twin-axial lines) are connected to the
BAL. LINE
terminals and a short jumper is installed between the WIRE post and the unmarked post below it.
WARNING
High RF Voltages! Route all single and open wire feedlines
to prevent RF burn and arcing hazards.
5.
A ground post is provided for an RF ground connection. This tuner must always be connected to the
station ground buss.
3.0 OPERATION
Содержание ATR-20
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