Portable 10-80M HF MagLoop opt *6M VHF UHF

The Alpha Loop is a tuned circuit that radiates more ERP by handling 100W PEP input on 10-40M & 20W PEP on 40/80M, which then further quiets the receive by using an inner shielded faraday pick-up loop.

Specifications

• *100W PEP SSB, 50W CW, and 10W digital on 10-40 meters
• *20 Watts PEP SSB, 10 Watts CW, and 5 Watts Digital on 40-80 meters with Booster Cable. 
• 6 Meter, 2 Meter & 440 MHz when the optional add-on element is purchased & installed.
• IP Rating: IP-53 – Protected against dust limited ingress, no harmful deposits. Protected against direct sprays of water up to 60 degrees from the vertical.
• Environmental operating parameters: -15 to 90 (in direct sunlight) degrees Fahrenheit and winds up to 35 Mph

NOTE: The system operates independently for either 10-40M, 40-80M, or 6/2/70cm by adding or changing elements.

Included

2 – 16 inch masts that couple together with a built-on coax mount
1 – 40/80M Booster Mast that is approximately 12 inches long
1 – Tuning box with Female 1/4 20 mount
2 – Outer loops (One for 10-40M and the second for 40-80M when daisy chained in series with the first.)
1 – Inner shielded faraday loop
1 – Field Bag for the Alpha MagLoop

Analysis

Real world SWR results on 10-80 meters shown at the center of each band without additional adjustments being made with spacing between the inner & outer loops, at a height of one loop diameter.

Materials Used

The following materials are used in the construction of the Alpha Loop antenna:

• Gold,
• Solder,
• Nylon,
• Ceramic,
• Aluminum,
• Stainless steel,
• Marine shrink tubing,
• Times Microwave LMR400, and
• 3D Carbon Fiber infused polymers.

Assembly

More Information

How is the Alpha Loop tuned?

There is a huge tuning knob that makes adjusting the loop for the lowest SWR very easy.

Attached to between the knob and capacitor is a 6:1 reduction drive, which increases ease of tuning even more.

To tune the antenna once it is deployed, just turn the knob while listening for the loudest noise floor in SSB mode, and then transmit at 5W in FM or CW mode while you tune and watch for the minimum SWR on your rigs built in meter.

How is the Booster Cable installed for coverage of 40 to 80 meters?

Install the Booster Cable as a double loop to form an outer loop that is over 21 feet in total length, which increases skin effect thereby increasing efficiency.

How can efficiency be increased on 12-40 meters?

Increase the efficiency by over 20% on 12-40 meters at75W PEP SSB, 35W CW, or 15W Digital by only using the included longer outer loop Booster Cable in lieu of the shorter default Outer Loop.

How can the Alpha Loop handle 100 watts on 10-40M?

How did we accomplish 100W power levels on 10-40M? We perfected each component which enables the antenna system to handle 100 Watts PEP SSB on 10-40 Meters. NOTE – Maximum PEP SSB on 80M is 20W.

How is the Alpha Loop able to use 6M VHF UHF?

Our engineers designed resonance on 420-450MHz and 144-148MHz plus 50-54MHz with an add-on element.

SIGNAL PATTERNS

Green = 40 meters, Blue = 20 meters, Red = 10 meters

Vertical Elevation Pattern

Azimuth Elevation Pattern

Options

A) Optional SWR Indicator

The SWR Indicator is a simple device for Magnetic Loop MagLoop antennas that makes tuning even easier.

WARNING! Do not exceed 10 Watts Continuous Carrier (FM, Digital, AM, etc.) while tuning or the indicator lamp will fail.

NOTE – Can be used on higher power loops only if the SWR Indicator is removed after tuning.

INSTRUCTIONS:

1. Install by attaching the Copper Clip to either of the PL259s at the loop’s tuning box.
2. Set your rig to the desired frequency in SSB mode
3. Tune loop till the loudest noise floor is heard from your rig’s speaker.
4. Set rig to FM or CW mode at 5 watts.
5. Transmit and tune for brightest illumination on the SWR Indicator’s LED.

B) Optional SWR Sounder

Place the SWR Sounder near any magnetic loop antenna and listen for the loudest beep as you tune for the lowest SWR.

C) **Optional VHF/UHF/6 Meter add-on element

Optional add-on element to enable 100W Magnetic Loop Antennas to support additional VHF & UHF plus 6 Meters, 2 Meters, and 440 MHz.

• Gain on 6M = 1.6dBd, VHF = 4.5dBd, and UHF = 7.2dBd

Installation and Tuning the VHF/UHF/6 Meter add-on element

Analysis (6M, 2M, 440MHz)

6 Meters (Click for full-size image)

2 Meters (Click for full-size image)

440MHz (Click for full-size image)

We are dedicated to improving all of our antennas. Specifications and descriptions on the Alpha Loop antenna are subject to change without notice.

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