Rotors - Cable - Shelves - Support Bearings. Rotor Cable. Ground Wire. Grounding Kit. Coax Seal. CW Units. Books - Manuals - Videos. CD's and Tapes. Uniden ProXL. Brand: Solarcon Product Code: A Based on 25 reviews Write a review. Description Reviews But beware this antenna will tune up fine even when it has deteriorated over several years. Give it seven to ten years and then retire it. Whips like a wet noodle in the wind but survives!
Coppers is the only place to buy it if you want it quickly and for the right price. Ordered one from a Walmart drop shipper took 3 weeks to ship.
Pipelayer NW corner. I like this antenna. An antenna any longer than a. For a very detailed explanation on the importance of the secret. The I-MAX uses a capacitance-inductance loaded coil in the base. In the diagram above, the top figure is the schematic diagram of the I-MAX Notice the location of the letter «B».
It is a capacitance connection that connects the main element to the the coil load. The diagram on the bottom is a rough drawn cross-section picture of the base coil load. On the left, is the coil that creates the 50 ohm impedance.
The 2 solid gray lines represent the tuning rings. The 2 rings are coated with an aluminum paint. As the rings are turned up or down, it changes the resonating frequency of the antenna to adjust the SWR.
On the right, the solid orange area is the brass sleeve that surrounds the nylon core. The brass sleeve is connected to the coil. During transmission, the brass sleeve generates an RF field all throughout the inside. A few inches of the main radiating element goes down inside the brass sleeve, but does not directly connect to the sleeve. That is where the inductance comes in. The RF field inside the brass sleeve is arched Inductance to the main element inside.
The main element picks up the RF and radiates it from the entire 22 foot length of the main copper wire element. However, in the I-MAX , with the. Therefore, much less coil is required to tune the I-MAX to resonance, which greatly reduces the coil losses. It also helps make this antenna very wide banded. The I-MAX on 17, 15, 12, and 10 meters. And it does this quite nicely too. And 12 meters is just below CB, so it loads up very well there as well. But here is where it gets interesting.
And with 17 meters being a small band, and not that far below 15 meters, the I-MAX will work quite well on 17 meters too with a tuner. It is important to use a good quality double shielded RG-8 type of coax like LMR, when using this antenna for 17 through 10 meters. Any coax will do if you are only using the I-MAX for just 11 meters, or 11 and 10 meters.
But when using the antenna to cover such a wide range of frequencies like 17 through 10 meters, only a quality double shielded coax can deliver the most power to the antenna with the lowest SWR possible.
America, and Europe are fantastic with very strong signals TX and Rec. All with just watts. The Ground Plane Kit. The I-MAX has a ground plane radial kit available. It consists of 4 fiberglass radials at 70 inches each. They screw into a bracket that mounts onto the antenna mounting bracket. The kit is fine if you just want to use the antenna for 10 and 11 meters.
But on 12, 15, and 17 meters, the radial kit will detune the antenna for these bands, and raise the SWR. Instead, I left the radial kit off, and made an open air wound choke coil with the LMR at the antenna feed point. The choke keeps the RF from coming back down the coax, and allows the full power to radiate from the antenna.
But it does not have any effect on the SWR on any band from 10 to 17 meters. No counterpoise wires are necessary. The I-MAX antenna is made for these bands, and is widely known to out perform dipoles cut for the same bands. An RF choke coil is easy to make. I created a great article on the myths about chokes and how to build the one I use. It is so simple and only takes a few minutes. The Tuning Rings. For ham radio operators only. Leave the rings set in the center factory position.
Do not move them ever. So they will have very little to no effect on 17, 15 and 12 meters. Changing the tuning rings will alter the wavelength on these 2 bands and slightly detune the antenna.
It will actually be «Electrically» too long or too short to be a. This setting should provide an even SWR rise to the highest and lowest frequency of 11 meters. But if you use one specific channel most of the time, and wish to tune the antenna to that frequency, you can raise or lower the tuning rings for the lowest SWR on the channel of your choice. Raise the rings higher, for better SWR on the higher end of the 11 meter band.
Or tune the rings lower for lower SWR on the lower end of the 11 meter band.
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