I ve got a cobra 29 thats tweeked and peaked and am trying to get the swr down on a co phase harness with wilson 2000 antanas ther down when im just tuning 1 to were it dosnt move over 1 on the meter but when i hook both up it jumps to3 whats wrong
When two antennae are cophased the harness should be made from 75ohm cable and then connected at the "T" then 50ohm to the radio. The spacing between the antennae is critical to the pattern of radiation and resistance of the system. If they are not the proper space apart for the length of the harness, you will not be able to tune them.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
what kind of truck? does it have a fiberglass body? If it does then you would have to go directly to the chassis to mount the antenna.If you got a different antenna , like a Wilson 2000 , you could either run it co-phased or single. you would have to get mirror mounts and coax or buy a kit that has it included . Tuning a single antenna is easy but a twin is harder to do. you have to tune each antenna individually. what you also have to do is stay clear of buildings, overhead electrical wires ( high tension ) and metal objects. Now we know this is impossible so just get the SWR down as low as you can and also make sure your doors a both closed when checking the swr.
with wilson antennas you don't have to need to run duals the proper way to adjust the SWR is to get an external meter like a trucker 2000 and a dummy load. you hook the dummy load to one antenna while working with the other and then switch the operation around. this way both antennas are matched seperatly yet work together.
HELLO STAN FIRST HAS THE RADIO BEEN PEAKED AND TUNED? SECOND IS THE INTERIOR LIGHT IN YOUR PICK UP RIGHT BELOW YOUR ANTENNA,IF SO YOU HAVE A PROBLEM BUT EASY FIX THE WIRING GOING TO THE LIGHT ACTS LIKE AN EXTRA ANTENNA CAUSING YOUR ANTENNA TO RESONATE TO YOUR RADIO CAUSING THE A W I LIGHT TO COME ON MOVE YOU ANTENNA BACK A LITTLE FUTHER AND SHOULD BE GOODif you want to get a bettter antenna get a willson 500 mag mount far better
Hi 20008,
Welcome to FixYa.
My name is John. I will be assisting you with your issue.
You need to have your SWR checked. You can get it checked at
any cb shack or Radio Shack for free. Sounds like you have everything
else in place. Let me know if you need further help.
Hope you find this solution helpful.
Thanks for choosing FixYa.
I have you had the radio peaked? If so this could cause that problem there is a can in the back of the radio that can turn it off. But if you haven't then get your SWR checked.
nearly all problems are caused by poorly tuned or untuned antennas. a good antenna system with a cheap stock radio will out perform a great tuned radio with a bad antenna system any day of the week. if you dont believe me, check the firestik antenna website's tech notes. or wilson's tech notes.
I hope this will help you on setting your swr put the radio on channel 1 check your swr. now go to channel 40 check the swr. If the swr is lower on 1 than it is on 40 the antenna must be shortened buy 1/4 inch.until you reach your desired swr.if the swr is lower on 40 than it is on 1 the antenna must be lenthened by 1/4 inch until desired swr.
start out by getting a good antenna like a wilson or k-40 if your using it on a big rig make sure its a metal mirror and door a lot of big rigs use fiberglass and thats a nono you must get a no ground plane antenna...its all in the antenna...good luck doc's cb shop ny
I believe it to be feedback but be aware of your Standing wave ratio because using a linear amp radiates signal to the point that it could cause that light to come on. There is a problem if the radiated signal is feeding back into the amp a a higher level that it can withstand over time.
×