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If these are stations that you have to before and had no problem hearing them then you are correct to say your receive is low. There are adjustments that can be made you check for low receive but you need the manual for the radio. If you go to www.cbtricks.com and look for the radio they also have the service manual.
find the wires going to the switch then follow them to make sure they are connected. If they are ,gently,with your fingers,turn the dial to either USB or LSB .then adjust your clarifier to receive a signal.
I'm not sure that is what you want to do. It seems like you are really asking to improve you receive or sensitize it. That may require some specialized equipment and if your thinking of giving it a go you might not like the end results.
Have you ruled out the speaker malfunctioning? Try hooking up an external speaker to see if it works a bit better. Also has anyone been inside the radio before and perhaps tried to do a receive mod to it? Sometimes it can be made worse if someone messes with it. Also who is giving you the receive radio check? Is it from someone fairly close? Also make sure the RF gain potentiometer knob on the front of the radio is tuned all the way to the right. There is a pot inside the radio than can be adjusted for receive as well or some coils. You have one of the best sounding base CB radios out there. Yet some insist on messing with it. Good luck. Any further questions, comments or concerns feel free to ask me.
Hi, my name is John. Welcome to FixYa. It will take a tune-up that involves some expensive meters. The tune-up should be only about $35.00 to $45.00. The 148 is a great radio, I have three myself and they are great. Only your local licence tech. can do it, or any CB shack. Good luck and thanks for choosing FixYa...John