Testing And Operation - MFJ Super Hi-Q Loop Instruction Manual

MFJ Super Hi-Q Loop Antenna
The control head draws 6 mA on standby. The current increases to 20 mA while tuning (because of the
tuning motor in the loop and the LED's). Additionally, the meter lamp can draw 35 mA of current.
Please note that the light in the meter draws more current than all the other electronics. When using
battery power, the extended use of the meter lamp should be avoided.
TO PREVENT DAMAGE TO THE CONTROL UNIT:
1.) Never connect a grounded power supply to the input jack.
2.) Never connect the power supply that is being used with this unit to ANY other device or
control head.
3.) Never exceed 15 Vdc of well filtered dc input to the control head power jack.
4.) Never connect any tuner, meter, switch, or other device between the control head and the
loop antenna.
5.) Always disconnect the antenna from this control head during lightning storms and unplug the
power supply.
6.) Always ground the control head to the station ground buss.
7.) Never transmit with more than 150 watts through the control head.
8.) Always ground the shield of the feedline to a good earth ground at the entrance of the
building for lightning and RF protection.

TESTING AND OPERATION

WARNING! Connecting a power supply that has outputs grounded to chassis or earth ground
will result in damage to the control head.
To test your new installation and familiarize yourself with tuning the loop antenna, follow this
procedure. Before starting, set-up the switches in the control head as follows:
Power Switch - "OFF" (out)
Meter Range - "HI" (in)
Meter Lamp - "ON" (in)
AUTO BAND SELECT- Both UP and DOWN buttons are OFF (out)
1.) Measure the resistance between the center conductor and ground of the coax feeding the loop
with an ohm meter, the resistance should be more than 600 ohms.
2.) Connect the loop feedline to the proper connector on the rear panel of the control head.
FAILURE TO CONNECT THE COAXIAL LEADS TO THE CORRECT CONNECTORS
9
Instruction Manual