What is a Slim Jim antenna?
The Slim Jim is a vertically polarized omnidirectional end-fed antenna having considerable “gain” and this is concentrated almost parallel to ground toward the horizon rather than skyward making it more efficient than a ground plane type antenna by about 50 percent better. It can be built for almost any frequency!
What is 300 ohm wire?
300 ohm twin lead is widely used to connect FM radios to their antennas, and was previously used to connect television antennas to televisions until it was replaced by coaxial cable.
How is dipole antenna calculated?
When determining how long to make each leg of a Dipole antenna, dividing the frequency in MHz into 468 will give the overall length. To find the half wave, divide that number by two. This will give you the length of each leg of the antenna.
What kind of antenna is a 2 meter J pole?
With twice the gain of a standard J-Pole antenna, the 2 meter Slim Jim antenna is a J-Pole on steroids! The Slim is an end-fed folded dipole antenna that has a gain of 6 dbi and a nice low RF take off angle.
How big is a 2 meter roll up antenna?
The 2-meter roll-up J-pole is lightweight (approx. 3 ounces), compact and effective! The antenna can be set up quickly and easily by hanging out a window, attach to a ceiling, or toss a lead sinker over a tree branch with kite string and hoist it up. Slide it inside PVC pipe for rigid vertical installation (retuning required).
What’s the difference between A J pole and a Slim Jim antenna?
Increased gain: compared to a standard J-Pole the Slim Jim has about 6dbi of gain. Wider Bandwidth: Almost 8MHz of 2:1 bandwidth (double that of the J-Pole antenna) More RF energy aimed at the horizon: with a take-off angle of about 7 degrees for the Slim Jim, compared to 20 degrees for the J-Pole.
Can a two meter antenna be used as a base station?
Product Description. Our flagship model, The Two Meter J-Pole Antenna comes in two different configurations, either as a one piece antenna for base station use, or as a two piece breakaway model great for portable operations. The J-Pole makes a great base station and emcomm emergency communications amateur radio and scanner antenna.