2
4.
Transmit a low power (1 W) CW signal and adjust the loop tuner for minimum SWR. If needed, use
a tuner or auto tuner to get the VSWR to minimum. This will take a little practice because an MLA
has very sharp tuning characteristics.
5.
You can make fine SWR adjustment by sliding the induction loop up or down about 1/4 inch.
6.
Once you achieve an SWR of 2.0 or less, you’re ready for a QSO. 6. Repeat these steps when QSY.
CAUTION: THE LOOP CONNECTORS ARE AT HIGH VOLTAGE WHEN TRANSMITTING. DO NOT EXCEED THE
MAXIMUM POWER RATING.
HG-1 REMOTE TUNING MLA
Retrofit replaces knob
There are currently two remote tuning options. They are the HG-1 Remote add on option and HG-1 WR Remote
Tuner Resonator. They both share a common HG-2 Controller. This controller provides different indications of
end of CCW & CW limits. Each will be explained below.
The HG-1 Remote Tuner (Retrofit)
The HG-1 Remote Loop Tuner is a compact, easy-to-use remote tuner for a Magnetic Loop Antenna (MLA). It is
designed specifically as a retrofit for the popular preciseRF HG-1 MLA. Now you can place your HG-1 Magnetic
Loop at a remote location, such as the top of your RV, away from obstructions, for better radiation efficiency
and less interference. The controller features an efficient, low noise, pulse width modulated, motor controller.
The drive motor RPM Rate is adjustable over a very wide range. This allows for precise tuning and low SWR.
A custom designed current limiter detects the end of the tuning range and alerts the operator when the tuning
limi
t is reached by a “stall” indicator. In addition, a failsafe slip clutch mechanism protects the motor and tuning
capacitor as well. Note: Always use a fresh 9V Battery or the optional power supply Any supplied battery may be
partially depleted.
While you may get a power light indication, there may not be sufficient battery power to run the motor. We
suggest for long term operation use the optional Universal Power Supply 9VDC available from preciseRF
Installing the HG-1 motor drive assembly.