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Model – Base Loop
Overview
The Base Loop is designed to operate from 10-40 meters, and is rated at 100W PEP SSB, 50W CW, or 25W digital.
Operation
The Remote has a Speed control knob and Left/Right buttons, which are used for tuning. To further reduce RFI, you can
plug the power supply into a dedicated power strip, which can be turned off/on.
Tuning
The following technique has proven to be the easiest method for tuning the Base Loop in nearly all scenarios:
1)
Turn the Speed Control knob on the Remote control to the far right, which is the fastest tuning position.
2)
Then use an inline SWR Meter, your rigs internal SWR meter, or analyzer to tune for the minimum SWR by
pressing and holding the Red or Green button on the Remote Control, but never press both at the same time.
Note 1 – The tuning speed will increase when the Speed knob is turned Right and decreased when turned Left.
Note 2 – You may to listen for the noise floor to peak, as an indication that you are close to a minimum SWR.
Tip– It takes approximately 40 seconds to tune from 40 to 10 meters with the Speed control knob turned right.
3)
After performing step '2', you can further tune the Base Loop by slowing the tuning speed by turning the Speed
Control knob to the left, which is a slower tuning position. Then tap either the Red or Green button till the SWR
on your rig's internal meter, antenna analyzer, or inline SWR meter is as low as possible.
Excess RF Exposure Warning
In the United States, the Federal Communications Commission has established guidelines for human exposure to Radio
Frequency (RF) electromagnetic fields. The commission's requirements are detailed in parts 1 & 2 of the FCC's rules and
regulations {47 CFR, 1.1307(b), 1.1310, 22.1091, 2.1093}. It is the responsibility of the owner/operator of this device to
follow all applicable warnings and precautions regarding human exposure to RF fields. Additional references:
http://www.arrl.org/rf-exposure
Version 2.1, February 3, 2023
Assembled – Base Loop
Page 1
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Summary of Contents for Alpha Antenna Base Loop
- Page 1 Model – Base Loop Version 2.1, February 3, 2023 Overview The Base Loop is designed to operate from 10-40 meters, and is rated at 100W PEP SSB, 50W CW, or 25W digital. Assembled – Base Loop Operation The Remote has a Speed control knob and Left/Right buttons, which are used for tuning. To further reduce RFI, you can plug the power supply into a dedicated power strip, which can be turned off/on.
- Page 2 Step Assembly as pictured on Page 1 ‘Assembled – Base Loop’ Install the following hardware towards the top of your 1.25” O.D. mast with 2 included U-bolts. Use a rubber mallet or hammer to tap the 2 black poles into the hardware labeled ‘Center’ and the 2 pieces of hardware labeled ‘Horizontal’.
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