Base 10-80M HF Digital EMCOMM Antenna
$1,299.00
MODEL: BASE EMCOMM
Base 10-80 Meter HF Digital EMCOMM Antenna for Emergency Communications that require a limited space stealth deployment solution.
BASE EMCOMM (EMERGENCY COMMUNICATIONS) ANTENNA FOR DIGITAL NVIS OPERATIONS
If you want a 100% American sourced 10 through 80-meter antenna from a U.S. company that is owned by an American, then this HF system is it.
SMALL WITH NO ADDITIONAL GROUND PLANE REQUIRED! This is the perfect antenna for boat or base installations without a lot of real estate or a ground plane that has a 1,000-mile coverage radius.
OPERATIONAL SPECIFICATIONS
The MIL-STD-188 M110a digital communications mode is rated at 25 watts continuous and bursts of 100 watts digital for up to 1 minute using the MIL-STD Data Modem Terminal (MS-DMT) and Automated Message Terminal (AMT) software applications.
EMCOMM DESIGN CONSIDERATIONS
A) Computer designed to maximize Q (efficiency)
B) Capacity Hat configuration to enhance your signals launch EMCOMM antenna patterns
PHYSICAL COMPOSITION OF THE SYSTEM
- 7075-T9 aircraft aluminum,
- Poly sheathed woven copper clad steel wire, and
- 316 stainless-steel.
INCLUDED EMCOMM COMPONENTS
- 1 Tuning match with Built-in SO-239 connector
- 1 Vertical Element made of 7075-T9 aluminum
- 3 Horizontal Elements made of 7075-T9 aluminum
- 1 NVIS 15 feet 4 inch element made of poly-sheathed woven copper clad steel wire and insulator
Base EmComm Antenna Analysis
Site Selection
Deploy the antenna at a site that is above and away from surrounding objects.
Assembly
A) Locate the match and mount and screw the match onto the mount.
B) Locate the black MilStick elements and screw each element onto the match.
C) Install the mount on a 1.25-inch mast pipe.
D) Locate the wire element and secure it under the base of the vertical element above the match.
D.1) Deploy the wire element horizontally at approximately 180 degrees in the opposite direction of your coax.
E) Run a dedicated RF ground wire to your equipment (not to a shared AC ground).
F) Connect your coax to your equipment and to the SO239 on the match, ensuring that the coax does not coil up on itself.
GUYING: At your discretion, you may use your own guy ropes to secure the mast.
EMCOMM Top Assembly Detail
Learn More About EmComm Antennas
EmComm antennas are used by Amateur Radio operators (hams) for Amateur Radio Emergency Communications. Hams assist with maintaining communications before, during, and after declared emergencies, disasters, or planned Special Security Events.The field of Emergency Communications (EmComm) also includes the routine, daily communications of public safety agencies at all levels of government. This includes law enforcement, fire services, and emergency medical services.
Learn More about Amateur Radio EmComm operations
Amateur Radio operators have many informal and formal groups to coordinate communication during emergencies. These Include:
- Local and State Emergency Assistance and Traffic Nets
At the local level, hams may participate in emergency organizations, or organize “traffic nets” using VHF (very high frequencies) and UHF (ultra high frequencies). At the state level, hams are often involved with emergency management operations.
- National Emergency Management Services
In addition, hams operate at the national level through the Radio Amateur Civil Emergency Service (RACES) – which is coordinated through the Federal Emergency Management Agency (FEMA) – and through the Amateur Radio Emergency Service (ARES) – which is coordinated through the American Radio Relay League (ARRL) and its field volunteers.
- Emergency Weather Information
Many hams are also involved in SkyWarn, under the National Weather Service, and provide emergency weather information to the NWS for analysis and dissemination to the public using EMCOMM antenna, radio, and power that is off the grid.
Reference: CERT EmComm Network (cert-emcomm.net)
We are dedicated to improving all of our antennas. Specifications and descriptions are subject to change without notice.
| Weight | 128 oz |
|---|---|
| Dimensions | 31 × 7 × 7 in |
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| mpn | |
| product type | Base HF VHF UHF Antennas, EmComm Antenna, Military Aviation Commercial Antenna, VHF UHF HF Antennas |
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| VHF UHF HF Antenna type |
Q & A
Mount it lower to the ground for some DX and to enhance regional NVIS communications. Mount it higher for some NVIS and to enhance DX communications.
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I first used the Alpha DX Antenna on field day with my FT-897 and leisurely made over 800 contacts from Australia to Japan and all over the US plus other DX locales. Flat SWRs were easily achieved by using the methods in the most excellently written user guide. The horizontal elements are actually radiating elements and when you add the length of all the elements together you have a 40 meter ¼ wave antenna. It’s no wonder this thing really outperforms my buddipole, which is fragile when compared to the Alpha DX Antenna. One of the cool things about the arrangement of the elements is that it’s like having three L antenna systems, each pointing in a separate direction. I’ve found that the L antenna gives me the best combination for a take-off angle and performance for NVIS (horizontal elements) as well as DX (vertical element). The last note that I’ll make is that the coil is located at the center of the antenna system, which if you know your antenna design and performance standards, it is either best to have the coil in the center or at the top of an antenna; never at the base!
5 months ago I saw my ‘Elmer’ set up his Alpha DX in less than 5 minutes and then witnessed how well it works! What also impressed me when I first saw it was how well the entire tripod, tuning bastion, and whips are built. Since buying mine in June, I can tell you that my Alpha DX has top quality build, it’s easy to setup, and I work the world on my home-brew QRP CW Rig. My Elmer still says that after using at least six different portable antennas over the last 30 years, this one beats them all. I’d definitely recommend it to a friend!
I received the Alpha DX Antenna and it was protected very well in its’ package during shipping. The antenna came with three radiating elements and a single vertical element, all of which are heavy duty stainless steel telescopic whips. Next to come out of the box was a well suited tripod with a standard mount that included an SO239 and 24×3/2 stud. As for the tuning bastion, it is an ingenious peice of hardware that sits on top of the mount and into which all of the whips screw into seperate 24×3/8 studs. Included in the tuning bastion is a High Q coil that can be tapped with the clip for 6-40 meter operations. After taking about 5 minutes to setup the antenna system, the first thing I did was hook up my antenna analyzer and use the included quick reference chart in the manual to tune the antenna, at the same time I placed a black or red magic marker tic mark on the coil for each band. Now to hook up the radio! Immediately I heard DX on 20 meters, made a couple of QSO’s to Japan and New Zealand, then to Alabama and New Mexico. So, I switched over to 40 meters after I moved the clip and heard QSOs up and down the band like it was field day. I got response to every CQ I placed on 40 meters with signal reports never less than 5-7. I of course had to try this thing on 6 meters, which gave me 4 QSO’s before I had to call it a night. What fun this antenna is, and easy to setup & use! I’d definitely recommend this to a friend.
It’s not perfect but it’s about as close as you’ll find. Where to start? Well the tripod is as heavy as it is heavy duty. I guess it’s perfect for the size of antenna it supports. The antenna has alot of load to it, especially after all four whips are extended. Those are some strong whips. I’d definitely guy the thing with some nylon ropes and secure the ropes very well. The performance is as big as the antenna and I’d put money on the fact that there isn’t anything portable that can touch it. No matter what band I chose, this thing impressed the receivers at both ends. In other words, it transmits as well as it receives, which I’ll tell you has always been between an S7 and S9. So I turned the power down to 5 watts and still got great reports on all of the bands. It’s been alot of fun using this antenna and it’ll be my go to antenna for true emergencies and daily communications.One of the things that some people remark about it that they don’t want to have to change the clip on a coil. That’s not a bad thing, because having the coil gives the antenna a higher Q. A higher Q basically means that more of the power get’s put out into the air. So if you have a QRP rig, this antenna will give you maximum performance. It’s pretty awesome that there is a single vertical radiating element centered above three horizontal radiating elements. On EZNEC this gives the radiations pattern of three L antennas. So what’s next? I guess I need to order the bag that is made for this antenna. I’ve heard good things about the quality of the bags from Alpha Antenna, and truthfully there are too many parts to not have some type of bag. By the way, I see that the Radio Society of Great Britian’s review on the Alpha DX Antenna is now available at http://www.AlphaAntenna.com
Received my Alpha DX antenna a week after placing my order and was happy to see it was packed very well for shipping. I was first impressed to see the quality of the optional carry bag was better than I was expecting and had enough extra room to pack 50′ of coax I wanted to carry for portable operations. I assembled the antenna in about 10 minutes taking my time and was on the air 10 minutes later on 20 meters and found the signal receive and signal reports to be very good considering I was in my backyard. I am using a portable tuner and had no problems finding good swr. I decided on this model because of the coil design allowing you to work QRP. The overall quality of materials and attention to detail from the heavy duty tripod to the elements is a good value for the money. I had one small issue with one of the elements and called and was sent a replacement that arrived in 3 days. A good antenna is one thing but a company you can get a hold of when needed is just as important to me. Looking forward to trying out some other antennas from Alpha Antennas!