10-80M & Marine HF Alpha ProMaster Antenna


Starting at: $299.00  $219.00
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  • Description
  • Reviews

OVERVIEW

The ProMaster is a balanced limited space (permanent base or transportable) antenna that maximizes effective radiated power (ERP) while maintaining a SWR on 10-80 meters and Marine HF bands of less than 2.5:1.

The on air experience of using this system is simultaneous omnidirectional NVIS and directional DX (reference the 3D Model below). Specifically, physically combining the Vertical aluminum mast and the 25’ Horizontal wire element enhances high band directional DX (in the opposite direction the 25’ wire NVIS element is run) and mainly omnidirectional low band NVIS. Please note that the included Grounded Counterpoise wire and stake will run in the opposite direction of the wire NVIS element, and this grounding completes the balanced circuit at the antenna (Note - Without the ground there would be no path for current, which means that there would be an open circuit and the system would not work as efficiently). Simply install the antenna approximately 5 to 7 feet off the ground on any conductive or non-conductive mast and connect your coax to the SO239 on the included grey NEMA box.

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User Guides

Specifications:

Frequency Coverage - 3.5MHz to 30MHz (Marine HF & 80 to 10 meters)
Power - 500W PEP SSB
Weight - 9 Pounds

Includes:

- 1 Heavy duty mount and hardware with Alpha Match
- 1 Self-supporting 6 section telescopic vertical element
- 5 Stainless steel clamps
- 1 25 foot NVIS Element
- 1 8 foot Ground wire & Ground stake

TECHNICAL DESCRIPTION

A low SWR across many bands is the nature of a well balanced OCF Dipole that often use a 4:1 Balun. The ProMaster is, however, usable on many more bands because it 1) provides a balanced RF ground using the included 8’ ground counterpoise wire, 2) enables balanced radiating elements with a 17’ 6” Vertical element and a 25’ Horizontal wire element that both intersect on the radiating side of a transformer, 3) then provides a feedpoint with a SO239 for the feedline that uses two of three connection points on a 5:1 transformer that are all enclosed in a high voltage enclosure.

The result of this broadband design makes the ProMaster perfect for ALE (automatic link establishment) or Digital Spread Spectrum modes, and effective for all other HF modes including, but not limited to, CW, SSB (USB/LSB), AM, etc. You may also use an external antenna tuner if your antenna is installed over a poor ground or not placed in a clear area.

LOSSES and CHOICES

To be clear, losses on an OCF Dipole exist, which has a 4:1 Balun that begins to heat up due to the transformer being saturated, where ‘losses’ increase as the frequency is decreased. Similarly, the 5:1 transformer in the ProMaster will also work to enable a SWR of 2.5:1 or less on the bands it is designed for. Yes, even a single band Dipole in free space will have loss as well, even though not as much loss as an OCF Dipole might experience. And Yes, you would have to install a 10 Meter Dipole antenna 5 meters high to ‘minimize losses’, and 10 meters high for a 20 Meter Dipole, 20 meters high for a 40 Meter Dipole, but you get the idea. What about a straight up Vertical, where of course you need to have some real-estate to run the necessary radials? Well, Verticals usually work ok for DX, if you do not have obstructions around you out towards the horizons. Oh, and a Vertical is traditionally noisier, experiencing higher RFI (Radio Frequency Interference), which can hide a weak signal...and you often lose NVIS capabilities.

The bottom line is that antennas built upon basic antenna construction techniques, like the ProMaster is, will work. But what antenna should you choose? Alpha Antenna recommends that you might consider choosing an antenna based upon your band usage as well as your physical, personal, and your home’s surrounding environment or restrictions. So consider what antenna manufacturers are available to answer your phone call and also your emails, then remember that we are here to help if you need any assistance determining what antenna might work best for you and after you purchase your Alpha Antenna system. BUT! If you want a 10-80 meter antenna that is pretty forgiving on how it is installed and works well for others, then the ProMaster may very well likely be for you.

INSTALLATION

The ProMaster can be mounted on the Optional Tripod or a mast between 1 1/4 to 1 5/8 inches O.D., which should always be at a minimum height of 5 feet. For example, it can be mounted on a galvanized top rail from a chain link fence or stainless steel mast, or the included 2 foot long aluminum mount can be bolted to a wooden fence post, optimally between 5 to 7 feet off the ground. Alternatively, the ProMaster can be roof mounted, but not on our tripod, if you have a mast between 1 1/4 to 1 5/8 inches O.D. When mounting on a roof, the 25’ NVIS Element can be tied off at an angle to a PVC vent pipe using an extra length of outdoor rated rope to the included green insulator after the aluminum stake is pulled from it. Then the ground wire can be tied off (with additional wire if needed) to your aluminum gutter or flashing at the edge of the shingles.

Optional Tripod:

The optionally available heavy duty steel tripod is designed for at least 2 years of continuous outdoor use, in non-salt water environments. Our two year outdoor test of this tripod revealed that it was still structurally sound, and only showed signs of fading with some surface rust (mainly on/around the screws). The optional tripod was tested for 2 years outdoors in the Midwest. After that time, it showed very few rust points and the black had faded, but nothing was structurally damaged. It’d definitely need to be guyed if it got too windy, and although the ProMaster antenna can be deployed in salt water environments, we do not recommend the tripod be used 24/7/365 around salt water.



3D Model of the Alpha Antenna® Multiband system


Analysis

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Video Guide on how to Deploy the Alpha ProMaster Antenna


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