MFJ
Super Hi-Q Loop
Antenna Instruction Manual
11
12.) If you go past the dip simply reverse directions with the opposite direction button. THE TUNING
OF THE LOOP IS VERY SHARP! It takes a little practice to catch the lowest SWR. Stop
transmitting and ID when done tuning!
Congratulations! You have successfully tested and operated your MFJ "Super Hi-Q Loop" installation.
You should now be familiar enough with the controls and how the controls respond to go to the easier
and more general operating instructions. Please remember the following important points while you
use the "Super Hi-Q Loop":
THE TUNING OF THIS ANTENNA IS VERY SHARP due to the extremely high "Q" of the
loop. The same thing that makes the loop work so well is what makes the tuning so sharp. If
you move more than a few KHz in frequency you will probably want to adjust the SWR. After
you use the antenna, experience will help you decide when to use the BAND SELECT or FINE
TUNE buttons.
TO PROPERLY TUNE THE LOOP ANTENNA ON "AUTO BAND SELECT" the control
head must have between 100 mW and one hundred watts of RF power at the desired operating
frequency applied to it, with one to 50 watts being the best power range. Although very little
power will be radiated until the loop is tuned, use the least power necessary during tuning.
Always check frequency
before
tuning to avoid causing interference.
GENERAL OPERATION AND TROUBLESHOOTING
After you have tested the loop as described in the "TESTING AND OPERATION" section you are
ready to learn the "short-cuts" necessary for easy, day to day, use of this antenna. The following section
will help you learn these short-cuts, as well as locate any problems that may occur with your new
antenna system.
There are two basic methods that you can use to tune the antenna during daily operation. One method
requires you to know whether the new frequency is higher or lower than the last frequency used, the
other method must be used when you can't recall the last frequency where the loop was used.
TUNING WHEN YOU DO NOT KNOW THE LAST OPERATING FREQUENCY
If you ever loose track of the last frequency the loop was used on you should follow this procedure:
1.) Press the "UP" AUTO BAND SELECT button. The FREQ "UP" yellow LED should light as the
loop moves to the highest frequency range. After the LED goes out, release the "UP" AUTO
BAND SELECT button.
2.) Select the proper wattmeter "RANGE" for the power you intend to use in tuning the loop and
transmit a steady, low power, UNMODULATED carrier on the desired operating frequency.
