2
the desired direction. Maximum gain is approxi20dB over the minimum direction. (see
illustration at right).
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 achiev
e an SWR of 2.0 or less, you’re ready for a QSO.
7.
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 TUNER
Retrofit - replaces knob
There are currently two remote tuning options. They are the HG-1 Remote option (retrofit replaces the knob)
and HG-1 WR Remote Tuner Resonator. They both share a common HG-2 Controller. This controller provides
unique indications of CCW & CW limits depending on the remote used. Each will be explained below.
THE HG-1 REMOTE TUNER (retrofit)
The HG-1 REMOTE TUNER is a compact, easy-to-use tuner for an MLA. It is designed specifically as a retrofit for
the popular preciseRF HG-1 MLA. You can place your HG-1 MLA 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
limit is reached by a red LED limit 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.