A VSWR meter is your best bet. They are cheap for cb's . If the antenna is badly mismatched you will get an antenna warning lamp on. If the antenna has a tuning coil you will see usually continuity to ground from the whip. Use the vswr meter on the radio. Set to calibrate first, transmit on channel twenty while rotating the swr cal knob. set needle on orange triangle at top right of scale. Select VSWR mode and transmit. needle should move up slightly if antenna is tuned correctly. Try chaneel 1 and 40 with same procedure. You can tell if antenna is tuned more toward the high or low frequency by how high the needle is on the scale. The higher the reading the worse the match is. If there is always a high scale reading then try another antenna that you know works.Watch for flattened/damaged/water in between braid and jacket or corrosion on coax as this will change the coax impedance drastically
SOURCE: Coax seems shorted
OK TAKE THE COAX OFF THE CB AND CHECK THE OUT SIDE AND INSIDE FOR CONTINUITY 0 OHMS IT IT DOES NOT SHOW 0 OHMS THE COAX IS GOOD. YOU ARE READING THE CIRCUIT INSID -E THE RADIO AND IS NORMAL.
SOURCE: Cobra 29 LTD Classic not transmitting or receiving
As I understand from a tech friend of mine, most truck beds are not grounded well enough. Perhaps you could borrow/purchase a magnet mount antenna and locate it on the roof, for testing. Then you would have it narrowed down to the location.
SOURCE: Cobra 29 LTD Classic not transmitting or receiving
ant. light should only come on if you have a high vswr a bad thing did you check that cb/pa switch is set to cb check your swr this is not a good place to mount ant. as it is close to metal of back of cab
SOURCE: With my CB I am getting feedback through the am fm radio speakers
Hello there:
the shielded coax rgu-45 series is probably the best one for this application also if you run the radio to a different fuse or u can also get a surpression filter that goes on the coax line I own a WL9000 KW. i had the same problem untill i got the filter installed at a loves truck stop in texas and no more problems since ok?
drive safe and best regards mike (warner transp.)
SOURCE: I have a midland 1001z, with a Cobra HGA1000 18
Hi Harry, I just got your note - sorry that you've been waiting 3 days. Your Midland is the traditional 40 ch 27Mhz CB - unlike the "new CB" that is really the 460Mhz FRS system. The Antenna should work as it too, is for the 27Mhz CB system. You seem to have the power run correctly as the radio does power up and visually works.
The problem could be one of several things. First, adjust the volume to about 1/4 and check the position of the CB/PA switch. It should be set to CB. If set to PA, the mic audio is sent to a speaker that would be connected to the PA jack on the back of the radio. Once the switch is set to CB, you ought to hear static from the radio's internal speaker. If you do not, rotate the squelch counter clockwise until you do - and readjust the volume to your liking. Rotate the squelch clockwise just until the static is silenced. Tune other channels for activity. Ch 19 is popular if you're near a highway, otherwise try them all. Stop on a channel with stronger activity - as you'll have the best chances of contacting this type of station (it is presumed to be closer to you). Key your mic to attempt contact between transmissions (the meter should indicate 3 or 4 for up to 3 or 4 watts output power when transmitting - if it does not, you should check your antenna and coax cable for damage and proper VSWR). The other station can not hear you while they are talking.
If they do not respond, try another channel and begin again. If you are unable to get a response, there may be an issue with your antenna or coax as mentioned above. Make sure that your coax cable is not crushed, pinched or cut. Replace and reroute any portion of the cable that is. Use the correct connectors or approved coaxial splicing devices. Twisting wires and braids together and wrapping with electrical tape is not the way to do it.
You can read some excellent info about VSWR from Firestick - a premium antenna manufacturer - here. I hope this helped and again, sorry for the delay. Please rate my reply - thanks!
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