It seems to be if i key the mic a few times, the channel goes up one. Please help
This can be caused by RF feedback. RF is radio frequency energy - the same energy that your transmitter puts out onto the coax cable & antenna.
RF feedback is similar to audio feedback in that some of the output re-enters the circuit in a place it doesn't belong or is designed. RF feedback is a direct result of a poorly matched antenna system as shown by an SWR meter. A standing wave ratio or "SWR" of 2.0:1 - 2:5.1 (read this as: two point zero to one and two point five to one) or greater is generally accepted as the worst SWR a transmitter can tolerate - but also requires lowering RF power (wattage) to continue transmitting.
Some common sources of high SWR are: 1) wrong cable type (usually a 50 ohm cable is used), 2) damaged cable, 3) untuned antenna, 4) damaged previously tuned antenna, etc. The SWR of an antenna system should be checked and adjusted as needed to assure maximum power transfer to the antenna. If the system has a high SWR, the antenna reflects some of the RF energy back on the coax - into the radio. The effects can be tingles / burns on the lips - if using a mic with a metal guard, noise, and erratic operation of some rig settings. This energy is unexpected and can cause all sorts of strange radio operations and is not an uncommon occurrence in a situation such as this.
You can correct this problem by purchasing or borrowing an SWR meter or bridge designed to work in the range of frequencies that your CB uses. Follow the directions included to lengthen or shorten antenna elements as needed. An ideal SWR is 1.1:1. Generally, any value of SWR less than 1.5:1 is considered very good. A check of SWR on the low, mid and highest frequencies will give you an idea as to how well the antenna works on the frequencies you use, and let you know which frequencies you should avoid.
Good luck!
SOURCE: Radio Shack TRC-502 cb radio
Here is the owners manual I'l see if I can get my hands on a internal schematic
http://support.radioshack.com/support_electronics/doc62/62220.pdf
SOURCE: cb radios-galaxy dx99v
This has an LED channel display, which is the same as the Cobra 29. You can pick up a new one, there are a few color options available. You need to be very proficient with de-soldering and soldering small parts. You need a desoldering iron or desoldering wic, and no bigger than a 30 watt sodlering iron, any bigger can burn the foil trace, and some solder. You have to open the case, remove the faceplate screws, remove the faceplate, remove the channel selector/pcboard, and the channel display pc board together. Now you desolder the pins of the display, aproximately 20, remove the diplay, insert the new display observing direction (make sure it is face with the decimal to the right place), solder each pin to the pc board, and clip off the excess section of the pins (which is sticking out of the back of the channel display pc board. If you have changed to a blue display, you need to remove the orange or green cover, and replace it with a blue one (I make mine from blue transparant report covers) and hot glue it to the inside of the faceplate where the old one would have been. The reason for this is that the blue light will not shing blue thourgh a green or orange cover, and if you use clear, the display will be extremely bright, and the blue cover will knock down the glare a little. Now just put the radio back together and fire it up.
Now with that said, if you think you may have any trouble with this, you can take it to any cb shop and they should be able to help you.
Any more questions, don't hesitate to email me at [email protected]
Dean Pitts
Rollin CBs
SOURCE: My CB does not work
I remember that if you have the weather channel active it will do that. Check to be sure its on cb, not wx
SOURCE: wont change channels...stuck on channel 8
on this radio you have to put the norm and channel 9 switch to normal or up if it is on ch 9 positon it will not change channels.
SOURCE: an old cobra 29 23 channel Cb that has no audio or key up
This is a typical indication of the finals being blown. Probably have to take it to a shop, but it would be expensive compared to the value of the radio
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