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Radio Shack TRC-448 CB Radio low SSB and USB Static

Discussion in 'CB Radio Forum' started by don4444, Dec 29, 2018.

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  1. Dec 29, 2018 #1
    don4444

    don4444 Bobtail Member

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    I have a Radio Shack TRC-448 and when I am on AM the static is loud but when I change to LSB or USB I can not hear any static until I turn the volume all the way up and even then it is not very loud.
    Is this normal for this radio?
     
    don4444, Dec 29, 2018
    don4444, Dec 29, 2018
    #1
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  3. Dec 30, 2018 #2
    Night Stalker10

    Night Stalker10 Road Train Member

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    Since this radio was made between 1977 & 1982, it probably needs all the electrolytic capacitors replaced. Then have an alignment done on the receive section of the radio.
     
    Night Stalker10, Dec 30, 2018
    Night Stalker10, Dec 30, 2018
    #2
  4. Dec 30, 2018 #3
    Ridgeline

    Ridgeline Road Train Member

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    This is a common problem, there are three transistors (two are for the product detector and the other is the audio preamp before the audio amp and speaker).

    Most likely the audio preamp transistor is bad.

    This is a common problem.
     
    Ridgeline, Dec 30, 2018
    Ridgeline, Dec 30, 2018
    #3
  5. Dec 31, 2018 #4
    don4444

    don4444 Bobtail Member

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    If that transistor is bad would it cause AM to work fine but have low static on USB and LSB.
     
    don4444, Dec 31, 2018
    don4444, Dec 31, 2018
    #4
  7. Dec 31, 2018 #5
    Ridgeline

    Ridgeline Road Train Member

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    Yep because am has a separate detector and preamp. There is a cap in the ssb section that could be replaced but I've seen the preamp go with a lot of these boards. It is best to take it to a good repair tech and have them carefully replace it with the right replacement.
     
    Ridgeline, Dec 31, 2018
    Ridgeline, Dec 31, 2018
    #5
  8. Dec 31, 2018 #6
    don4444

    don4444 Bobtail Member

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    Where is that transistor located is it one of the three attached to the back of the radio?
     
    don4444, Dec 31, 2018
    don4444, Dec 31, 2018
    #6
  9. Dec 31, 2018 #7
    Ridgeline

    Ridgeline Road Train Member

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    Q215, q216, q217. Don't know where they are located, they are on the board itself.
     
    Ridgeline, Dec 31, 2018
    Ridgeline, Dec 31, 2018
    #7
  10. Dec 31, 2018 #8
    don4444

    don4444 Bobtail Member

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    What is the number for the cap that could also be bad and witch is the location number for the preamp Q215, q216 or q217.

    Thanks
     
    don4444, Dec 31, 2018
    don4444, Dec 31, 2018
    #8
  11. Dec 31, 2018 #9
    Ridgeline

    Ridgeline Road Train Member

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    I don't know what cap number, the tech will know.

    Q217 is the preamp but you have to check if the product detectors are working.
     
    Ridgeline, Dec 31, 2018
    Ridgeline, Dec 31, 2018
    #9
  12. Dec 31, 2018 #10
    don4444

    don4444 Bobtail Member

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    I have checked the Q217 Transistor and it test fine do you thank it could be Q216, Q215 or the cap?

    Thanks
     
    don4444, Dec 31, 2018
    don4444, Dec 31, 2018
    #10
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