Audio Catalog for this item
The Alpha Loop (Sr) with 6:1 vernier reduction drive offers you a light 10-40 Meter 30 watt PEP SSB (approximately 15 watts CW) transmit/receive antenna in a small package that deploys in 2 minutes. * OPTIONAL 40-80 Meter Booster Cable increases performance on 40 meters and enables 20W PEP SSB (10W CW) operation on 60 & 80 meters.
One of many testimonies of QRP operators around the world: "I just had a reasonably long QSO on 80 m from Adelaide South Australia to Caragabal NSW which is a distance of almost 1000 KM. The alpha loop was sitting on my desk next to me inside the house (under the iron roof). My signal was 5/9. Now I really believe it works - Joe VK5FBHE".
The Coaxial Alpha Loop Antenna is portable via the included pedestrian AlphaLoop Support or you can optionally mount it on the included tripod. Place it on your table beside a rig for base ops, in the passenger seat of your vehicle for a mobile antenna, or use it in the field as a high impact tactical antenna solution.
This is perfect when you need a High-Q directional HF antenna with low noise capabilities. This is the only Commercially available loop that uses an inner Shielded LMR400 Faraday Loop, which lowers RFI by shielding the loop your coax connects to. Also included is the LMR400 based outer element of the Alpha Loop.
6:1 Vernier Reduction Drive
Outer Loop with Continuous frequency coverage from 7 to 29.7 MHz is over 9 feet in circumference and uses marine sealant and crimped & soldered Silver Plated PL-259s, which is the same technique used to build MIL-SPEC connections for the U.S. Military
Duffel Bag dimensions in inches - 12"x12"x3.5"
Mount - Integrated mount with 3/8x24 & 1/4x20 threads
Tripod - Fits in go bag and deploys under the loop
Silver plated SO-239s are milled and formed 100% in the U.S.A.
Alpha Match enclosure - High voltage enclosure
eHam Reviews of the Alpha Loop antenna line
ABOUT THE INDIVIDUAL COMPONENTS
Outer Loop: Constructed from LMR-400
Inner Loop: Shielded directly fed faraday loop that remains rigid to enable stable tuning and prevent SWR fluctuations.
Variable air capacitor: No RF conduction currents flow through the bearings of the rotor on the variable air capacitor that is constructed using dual gang split stators.
Connectors: All connectors are silver plated using the highest quality connectors available
Housing: High voltage enclosure
Tripod: Integrated mounting point for antenna
Padded field bag: Custom bag holds all components with room left for gear
Assembles and disassembles from the included field bag in 60 seconds. As this antenna is a loop, there are no taps on coils and no counterpoise wires needed. Has a built in tuner that allows you to easily match the antenna for transmit and receive from 7 to 29.7 MHz (40 Meters through 10 Meters). High noise rejection is also one of the favorite features of this antenna for many operators in RFI prone environments.
HOW DOES IT WORK?
The Coaxial Alpha Loop Antenna appears as a large resonant circuit to your transceiver. The loop is a large single turn inductor of the circuit. Due to the large size of the inductor, radiation of your signal very easily takes place.
*OPTIONAL 40-80 Meter Booster Cable
The AlphaLoop Booster Cable enables your 10-40 meter Alpha Loop antenna to transmit and receive on 60 & 80 meters using 20 watts PEP SSB, while increasing the efficiency for 40 meters over the single turn loop.
The Booster Cable consists of a specially tuned section of Times Microwave LMR-400 coax plus a double-female SO239/UHF connector that connects to either PL259 on your 10-40 meter outer loop, resulting in increase performance due to a double loop configuration. The Booster Cable is easily installed or uninstalled with Velcro straps.
Included Go Bag
Inside the Alpha Match
Back of Alpha Match
Front of Alpha Match
Advantages of the Alpha Loop over other manufactured loops:
A) There are no lossy mechanical A/B switches in the Alpha Loop, which do increase resistance in the most sensitive location (at the capacitor).
B) Soldered, rather than crimped connections, are the only connection type used to connect the variable air capacitor to the SO239s within what we call the grey Alpha Match box.
C) Silver plated SO-239s & PL259s are used, which lowers resistance far beyond what the other connectors do.
D) The Booster Cable from Alpha Antenna increases the overall size of the Outer Loop by over 120% for 40 through 80 meters, thereby increasing real efficiency, rather than adding a lossy A/B switch and other losses to enable the antenna to function through 3.5 MHz.
E) Solid wire, rather than stranded wire that can introduce losses, is exclusively used between the variable air capacitor and SO239 connection points.
F) A nylon shaft is used to significantly lower hand capacitance between the knob and the variable air capacitor, rather than a metal shaft that can cause RF burns and will cause tuning to be difficult because of hand capacitance.
G) Rather than cutting corners and installing only two bolts on each SO239, Alpha Antenna uses four stainless steel bolts to hold the SO239 connectors in place.
H) A double walled electrical enclosure with built-in metal nuts and a rubber grommet that seals the lid are used in the construction for the housing of the Alpha Match, rather than thin walled housings with plastic catch points for screws or no rubber grommet to help keep the elements out that are found on housings other manufacturers use.
I) True Times Microwave LMR-400 coax is used for both the outer loops and the inner loop, rather than sub-standard coax or hardened aluminum both of which increases resistance and thus losses.
J) A built-in tripod mount is integrated into the well engineered Alpha Loop's matching box, rather than table top or PVC pipe holes for tripod mounting.
K) Reversible mounting hardware on the Alpha Match allows the user to customize the configurable option that places the tuning knob on the top or bottom of the loop's matching box, rather than forcing the user into just one operational configuration.
L) The Alpha Loop is the ONLY manufactured system that uses shielded faraday technologies to construct the inner loop. Even if another manufacturer succeeded in meeting the high standards in the previous points, they would fall short if this technology that has been patented by Alpha Antenna wasn't integrated.
We are dedicated to improving all of our antennas. Specifications and descriptions are subject to change without notice.