It seems when iam in the ohio area i don't get an antenna lite when trans mitting. i had one when i was in the tennesee area or down in that area, but when i was in the pa. area or when i got back to the ohio area, i lost the antenna lite when i transmitted. this could be just a fluke, but i want to find out how to calibrate the swr on the radio. is it something in the radio that i have to adjust, like how i calibrate it on the cal button, or is it something with the antennas. the antennas were on the truck. it is a freightliner antenna setup. i think one antenna is a fire stick and the other is a k40 with 2500 watts capibility. ican adjust the top of the k40. i am not sure about the fire stick. can you help me understand and learn to fix this problem myself? thanks for your help. steve
An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert whose answer got voted for 100 times.
An expert whose answer got voted for 20 times.
Re: no antenna lite when transmitting
Antenna light should be a warning indicator for high VSWR..... simple rule of thumb for CB antenna.... the lower the frequency "channel" the longer the antenna length, higher the frequency "channel" the shorter the antenna length. Your vehicle is a ground plane, where you mount the antenna will also affect its operation and tuning. A properly tuned antenna will have lower reflection on the midband channels and gradually rise as you near the upper and lower end of the band. Some base loaded antennas will be noticably narrow in bandwidth, if you have that problem then tune it for the channel you use most! K40 has always been good for easy tuning and band coverage, center it on the vehicle top for good omni coverage! PS... always make sure your connectors are secure, a loose shield will ruin your day when adjusting SWR!
- 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.
The shift tube can crack(gets looser and looser) or the pin break on some cars. Not a fun job to work in that area. Watch out for airbag also. Unhook battery cables and let sit several minutes before working on steering column.
May be best to take to good mechanic.
Also, you might just have a bad bushing at the trans lever area.
Check the feedline to the antenna, and the antenna itself. High SWR means that power is being reflected back from the antenna. A good discussion of SWR may be found here: http://www.hamuniverse.com/wc7iswr.html
If you antenna is designed for 10M and your are trying to transmit 20M on it, there will be a significant mis-match. You may want to look at installing a better broadband antenna, such as an OCFD that will operate better on multiple bands.
If it's interference from the high tension wires,you probably need new spark plug wires with good resistor type plugs.
Now,also a bad antenna or a poor match of frequency to the antenna from the rec eiver can cause weak reception.Anyone who knows electronics can match the antenna to the receiver. don-ohio
The mounting and adjusting of the antenna is crucial,if it is a magnet mount,the surface must be clean,dry and best to not have any rust,also bottom of the magnet needs to be clean and mount it to the largest area of metal on the vehicle...the trunk lid,middle of your roof are the best.Permanent mounts need to be touching bare metal at the mounting hole not paint,again either mount requires SWR adjustments to match the radio it's attached to,it may require trimming of the metal"whip" if it needs to be lowered for the best reading,also don't rule out the radio chassis might need to be grounded as well.For general safety I would not recommend touching an antenna while it is transmitting any radio signal...if all above is good,you transmit and receive fine,more likely light is faulty or needs it's sensitivity adjusted...Good luck,hope this info helps.
This problem is usually one of two things. Check the antenna coaxial cable and connections first, to be assured there are no shorts. That's one of the symptoms of receive and no transmit. The other would more than likely be a defective RF Transmitter stage in the final amplifier circuit. That could be a defective (blown or shorted) Power Transistor or IC (Integrated Circuit) Module.
After checking the antenna and coax, key the Radio up and look for any meter or indicator sign of TX (Transmitted power). If you have a power meter, use that for power and SWR (Standing Wave Ratio which should be close to 1:1 ratio) checks of the radio and antenna system. If there is no power, then you will need Technical help from a Professional at a repair facility, unless you are familar with this work. The antenna problem, if it exists...you should be able to fix.
Let me know when you get this fixed, and contact me again for more help. Thanks.
may be u burned yr final transistors...check if yr antenna is well grounded and try just after this to transmit, if the indicator is not stable on the green area when you are in "am" modulation stop to try and bring to the assistance