Arrow Antenna OSJ146/440 Antenna

[k1agh]

Arrow Antenna OSJ146/440 Antenna

I brought this antenna for 2m and I hooked my scanner up and it works better then the scanner antenna I use. It pulls in more signals and everything comes in clearer. Strange that it works from 120.xxx on up.

 

[teufler]

Pretty much any external antenna will produce signals that we have not heard before. Now are they as good as antennas that are tuned or cut for the frequencies in question, probably not, but they are usually mounted in the clear, they work. I have friends that use old outside tv antennas that are still mounted horizontal, for a scanner and they work. Some report a 100 miles reception.

 

[k1agh]

Im hearing things that were static before without static. Im even hearing the states new communications system repeaters from northern maine and im over a hundred miles away. Ive aken down the ols scanner antenna and will switch between the 2m radio and scanners. Wish I could hook both up at the same time.

 

[methusaleh]

Thank you for sharing this.

Might be fun to build your own j-pole next time, or perhaps a rollup portable one for monitoring when you travel.

If you want to improve your signal even more, maybe it's time to upgrade your feedline coax as well.

 

[cmdrwill]

Arrow Antenna OSJ146/440 Antenna

One of the much better antenna designs. We use them and are more than pleased with the performance.
NOT just a J pole, different design.

 

[w9xxx]

The arrow Antena is really wide banded for receive. I bought mine years ago to work ham radio ssatellites. I actually use it more to pickup tv in areas my trucks built in tv antenna won't catch anything.

 

[AK9R]

NOT just a J pole, different design.

It's still a J-pole. It just doesn't look like one.

A J-pole is an end-fed half-wave antenna. The portion of the antenna where the elements are not parallel is the radiator. Because the feedpoint impedance is high, a transformer is needed to bring the feedpoint down to 50 ohms. The portion of the antenna where there are two parallel elements is the transformer which is basically a quarter-wave. The characteristics of the antenna (bandwidth, impedance matching, pattern) are determined by the diameter of the elements, the distance between the parallel elements, and the height of the feedpoint relative to the shorting bar at the end of the transformer. Notice I've said nothing so far about gain. A J-pole really has no gain relative to a dipole.

Arrow chose to eliminate the shorting bar which is about the only difference between their OSJ antenna and a traditional J-pole. BTW, "OSJ" stands for "open stub J-pole".