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This is just one of the many configurations this antenna can take. The PVC brace fixes the antenna vertically and removes any strain on the ball mount caused by the antenna which is somewhat heavier than the previously installed "Hamstick" style antennna.
The brace is screwed to the luggage rack base with decent size screws. The wire tie in the photo is left over from the installation and has since been removed. The matching coil was wound on a 2" PVC pipe form with a slot cut in the pipe to permit easy connection of the alligator clip on the fly lead.
The heat shrink tubing at the lower left of the coil protects the braided copper strap that connects the bottom of the coil to ground. The connecting points on the coil have since been tinned to retard the patina on the bare copper wire of the coil. I was intrigued by the article and scanned a copy of it to put in my files for future reference. Like most of these files, it was dimly remembered, if at all, for 12 years. The other day I was casting about for my next project when I re-examined the article by Frank W.
The antenna consists of a matching coil at the base, a short mast up to a loading coil and the requisite whip or stinger at the top. The RF is tapped onto the matching coil which is grounded at the base to inductively load the antenna at the proper impedance.
The top of the loading coil is connected to the whip or stinger at the top of the antenna. By varying the tap points for both the matching coil and the loading coil, resonance and a suitable SWR can be obtained on any band that falls within the limits imposed by the overall size of the antenna. I have, in the past, had PVC joints fail due to various stresses. The brace attaches to the luggage rack on my SUV and prevents the antenna from twisting around the ball mount at the base.
The next order of business was to wind the coils. I started with the matching coil since it was only 11 turns. I even thought those five little words that I know are guaranteed to make any project nearly impossible. I am sure that if I had access to the proper jigs and winding apparatus it would have been a snap.
Without those however, it turned into a near disaster. First a combination of drilling two holes with a step drill and connecting the holes with a saber saw made a reasonably neat slot in the form to allow the fly lead to clamp onto the turns of the coil to come.
That was the easy part. After much fussing and false starts I managed to wind 10 turns onto the PVC form. The turns were not smooth, each turn had to be tweaked to keep it tight on the form, etc. I finally got it into some sort of shape so that I could secure the turns by laying straight lines of hot glue from top to bottom of the coil across the wire turns. I even managed to get the loose ends of the coil out through the PVC caps at each end of the matching coil. The lower end of the coil was soldered to a length of copper braid for the ground connection.
The upper end was soldered to the wire wrapped around the fiberglass core of the old antenna.
At that point I looked at the problems I had winding the short matching coil and decided that I should look for an alternative to winding the loading coil by myself. As luck would have it, the latest issue of the MFJ catalog was on my desk, and a perusal of the contents quickly found the coil I wanted. I called MFJ and they had just made a batch of that very size. One was soon on its way to my house. I fretted for a moment or two and then dug into my stash of ABS plastic sheeting.
I then cut it down to about 2 x 4 pieces for storage. I then adjusted the dimensions of the ABS squares so that the coil fit neatly onto them.Now you have an automatic bandswitching 5-band dipole! Use a fiberglass pole on a tripod and you are on the air!Unboxing the MFJ-2104 Octopus Antenna (#182)
An easier way is to just set each dipole approximately on frequency and use an antenna tuner to operate and widen the bandwidth. Super stong fiberglass filled ABS base insulator.
Your Octopus Hub will give you years of trouble-free service! Octopus hub with your choice of four 2 each W Hamsticks.
When submitting your order choose 4 of the hamsticks listed at the bottom of this page and write them in the notes before submitting your order. About 7 feet fully extended, 4 feet collapsed. Read more.
Reserve yours today, risk free! Placing an This unit covers 5 bands within the amateur radio spectrum 3. The course i The 4th sub-regional Youngsters On The Air event of Strongest, most universal mobile mount available. Posted date: January 08, in: Review. Mercury Paddle- Bencher December 27, No comments. Recent Posts. Most Shared Posts. Brazil holds and MHz consultation Highest-ever resolution images of the Sun unveiled for first time by British Icom IC Icom Inc.Octopus antenna hub turns your ham-sticks into four fully balanced dipoles in minutes!
Now you have an automatic bandswitching 5-band dipole! Mounts on any mast up to 1-inch in diameter. Use a fiberglass pole on a tripod and you are on the air! Interaction between bands is minimized because the ends are spaced apart at a large angle. An easier way is to just set each dipole approximately on frequency and use an antenna tuner to operate and widen the bandwidth.
Super stong fiberglass filled ABS base insulator. Your Octopus Hub will give you years of trouble-free service! About 7 feet fully extended, 4 feet collapsed. MFJ Octopus antenna hub turns your ham-sticks into four fully balanced dipoles in minutes!
Single coas feed, built-in balun.
Hamsticks break down to four feet for easy storage. Cookies on this site are used to personalize content and ads, to provide social networking features and analyze traffic. We also share information about your use of the website with our partners social networking, advertising and web analytics who can combine it with other information provided to them or they have gathered from the use made of its services.Use metal pole or telescopic mast up to 1 inch, easily secured, tightens with thumb screw.
Rotate with a small TV rotator or just ground mount for omni-directional. Use eight Hamsticks, 2 of the same for each band. Has built-in balun and a super strong base tube insulator made of fiberglass filled ABS. Get years of service out of your Octopus! Put this antenna up in minutes! Makes for a great stealth, portable, campground or permanent base antenna with a Super lightweight, foot diameter.
Hamsticks break down to about four feet for easy storage. I don't list items that are not in stock or items that will be shipped from another location drop shipped. I don't sell used or refurbished equipment. Item will ship same day or next day after payment is received, depending on the time of day payment is received.
Saturday purchases must be completed before AM Eastern Time to be shipped the same day. Feedback will be left the same day or next day after payment is received. I don't charge taxes, handling fees, or inflated shipping. You will receive a email with the tracking number when the package ships.
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Today we are announcing a broad set of updates to SteppIR and our focus moving forward. As always, we will continue to produce the best amateur HF-communication products in the market today.
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This project involves a management team of volunteers who each take a topic of interest and manage it with passion. The site will be something that everyone involved can be proud to say they were a part of.So how does it hold up in 60 MPH winds, harsh desert environments and portability as a quick setup field antenna system.
Octopus antenna hub turns your ham-sticks into four fully balanced dipoles in minutes! Now you have an automatic bandswitching 5-band dipole! Use a fiberglass pole on a tripod and you are on the air! An easier way is to just set each dipole approximately on frequency and use an antenna tuner to operate and widen the bandwidth.
Super stong fiberglass filled ABS base insulator. Your Octopus Hub will give you years of trouble-free service! Octopus hub with your choice of four 2 each W Hamsticks. Much larger diameter loading coil and wire gauge gives you higher-Q. Lower losses let you dramatically talk further and hear better. MFJ puts your call back on the map! This fiveband 20, 17, 15, 1… Read more.
Here is an old ham radio operators trick for cleaning wires for soldering that are old and corroded. It is hard to find this technique printed anywhe… Read more. It is usually mounted vertically, with… Read more. This week the Sun comes out of hibernation with a fast growing active region and a large coronal hole rotating into Earth view.
Although the region 2… Read more. Update on our current specials through April 30th, ; a renewal of a program, Hamcation news for Yaesu, and other items.
Read more. Av… Read more. Used under… Read more. So how does it hold up in 60 MPH w… Read more. Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email.
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