Co-Phase tuning problem

Why do you want to co-phase on a 4 wheeler ? if it's not that important i'd go with one, you are not likely to do any better with two....

 

stick one 102 inch steel whip from radio shack on that jeep. best antenna dollar for dollar you can spend, and that will not be too much. the steel antenna will have twice the gain of one of those cheap firestiks.

 

Here's a little something I picked up from the worldwidedxforum . 2 antennas for the cb will only really be beneficial if you can get them spaced at least a 1/4 wave apart (approx 9ft) less than that the benefit is seriously minimised and any gain would be offset by radiation pattern distortion, you'd be far better off using one in a central location (ideally roof mounted) for an omni directional radiation pattern, the other problem you would encounter with 2 antennas is co phasing them,as the antennas would be parallel to each other you would have to use a 75 ohm co phase harness to get them matched, using a dummy load on one as you match the other and vice versa. not for the feint hearted if you ain't sure how to do it. Diesel rig drivers can run dual antennas. But that's because the antennas are 9 ft apart! They also transmit bi-directionally. It works for them. You will see better performance with only one of your antennas mounted to your tire rack or rear bumper, cowl mounted antennas seem to perform just as well. With your jeep you do have some hurdles to overcome as there really is not a "good" mounting place.

 

I don't understand why anyone needs gain for a mobile radio anyway. You're limited to line of sight except when the band is open, and 4 watts will get you to the radio horizon easily and be enough to take advantage of ionospheric propagation (skip) when it's available.

 

Yes i'm anxious to know why as well. meanwhile one should do it just fine.

 

If you haven't grounded BOTH ends of the steel tube (ground braid from each end of the tube to the vehicle body), then it may be causing phasing problems.

 

Did you make your own coax harness, or did you use one that was made for the array?

 

This link may help you also...