I have purchased two of these radios,when i transmit on lsb everybody says i am distorted an unaudible.I took the first one back.The second one wont transmit on sideband.I use to love the old 148 but the new one is a piece of junk.I called cobra in chicago and talked with customer service.The answer to my problem i recieved was turn the voicelock(clairifier)all the way to the right and the anl off....?WHAT? i believe cobra has a big problem with this radio and wont admit it. Their customer service is less than desired.What can i do to solve this problem?
Open the radio up and find the L22 Can/Pot. It's the one with the wire soldered on top. With both fine and coarse Claifier/Voice Locks in the 12 O'Clock positions, confirm, then listen for someone that is on the correct frequency and turn this pot (small ferrite core inside) with a small plastic preferred screwdriver, until they sound clear. Do this for USB as well except, the Can/Pot is L59. Don't adjust the VR5 (transmit) unless you need to.
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If theres no carrier its either the finals or driver. If theres no audio its the white wire in the plug that screws into the radio..its either broke or most likely come unsoldered. It keys but no audio.
I would say a bad or cold solder joint on board somewhere. Bad quality control. Might flex radio chassis slightly while keying? A tooth pick and hours of probing around switching area on board and the pa section till problem found.
make sure that your [swr] hadn't changed or went higher than a 1.5, anything higher will interfere with your tranmitting an recieving. other than that with out being there to see an hear your radio this would be the first place to start.
THE ACTUAL FREQUENCY IS THE SAME THE ONLY FREQUENCY THAT CHANGES IN THE RADIO IS THE CRYSTAL OSCOLATOR. IT SHIFTS FREQUENCY UP OR DOWN IN THE SIDE BAND MODES. SO YOU WILL TRANSMIT
AT 27.285 ON CHANNEL 19 OR 27.335 CH 35 AND SO ON.
Do you remember the old 40 channel CBs? they used basic A3A transmission (dual sideband single carrier)remember how you got crosstalk sometimes, if your power was too high? Then they went to 80 channel CBs (using a single side band as Lower Side Band (lsb) and the other as the upper side band (usb))? more crosstalk but they invented anl (automatic noise limiter)circuitry to compensate. Now you have the 120 channel CB which uses a form of side band multiplexing (20QAM) to generate 3 times more channel density 40 X 3 = 120. Here is my problem; Cobra should not have done this because you will have massive crosstalk and unaudible sounds because of the increase in channels but not an increase in initial (physical)bandwidth. I hate to tell you this but the only cure for the is to use it in 40 channel or 80 channel mode forget the 120 channel mode, or get a radio with better channel separation.