Sears roadtalker 40 no tx

Discussion in 'CB Radio Forum' started by Jeremiahjohnson, Sep 18, 2019.

  1. Jeremiahjohnson

    Jeremiahjohnson Bobtail Member

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    Ok so I took the radio and mic apart and started probing around looking for obvious shorts/open circuits. Couldn't find anything put it all back together and now it's working fine.... Maybe something is loose in there and I moved it back idk... Gave the radio and mic a few love taps to confirm but it's still transmitting fine. Was thinking maybe something was getting hot and going open circuit but when it first died I let it sit out of the sun for nearly 4 hours and it was still borked. Idk beats me lol I'm not an electrical engineer, just trying to use common sense
    Also I can't get my swr below 3 on the built in meter so I'm trying not to do any extra transmitting. Just a quick radio check as to not heat up the finals.
    I've checked the cable and grounded the hell out of everything. Antenna is mounted to a brush guard on the front of my rig. The cable is a little too long but I did my best to route it away from interference sources and it isn't coiled up or crossed over anywhere.
    Will try an external swr meter in the morning
     
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  3. Jeremiahjohnson

    Jeremiahjohnson Bobtail Member

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    Aaand it stopped transmitting again. Checked swr with external meter. It's under 2. So ...no idea guys.
     
  4. Night Stalker10

    Night Stalker10 Road Train Member

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    Sounds to me like there’s a cold solder joint somewhere, or possibly a leaky electrolytic capacitor due to the age of this radio.
     
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  5. Night Stalker10

    Night Stalker10 Road Train Member

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    The radio was probably built by Uniden. Uniden built radios for several other companies, including Cobra up till 1994. That’s one of the reason these old radios lasted so long. Uniden didn’t skimp on the quality of parts. The Madison base radio and the Cobra 2000 had the same Uniden board in them. That’s why everybody loved those two radios back in the day. I owned the Madison years ago and I wished I would’ve kept it.
     
    Last edited: Sep 20, 2019
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  6. buddyd157

    buddyd157 Road Train Member

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    THAT'S what i could not remember yesterday. who built cobra, or Uniden....thanks!!
     
  7. buddyd157

    buddyd157 Road Train Member

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    i had a Johnson Viking, 23 channel. i wish i had kept that as well.
     
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  8. Night Stalker10

    Night Stalker10 Road Train Member

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    Oh yes, another great CB radio from days gone by. I still have a Johnson 123A, 123B and a 323 I believe it is. They weren’t pretty looking radios, but boy they sure worked great.
     
  9. Ridgeline

    Ridgeline Road Train Member

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    Why do you guys always think that uniden built all these radios?
     
  10. Night Stalker10

    Night Stalker10 Road Train Member

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    A few years ago, I came across a website called “thecbdoctor”. He had a history page about cb radio, and he claimed that Uniden made radios for other companies. He said in 1994, Cobra decided to to make their own radios, and I believe he said that was when they started making the cobra radios in China. I believe he retired a couple of years ago, plus his website doesn’t exist anymore. He still has a utube video called Cobra 2000 Audio Repair.

    So doing some other research, I came across this from Wikipedia.


    HistoryEdit
    Uniden was established on February 7, 1966 by its founder Hidero Fujimoto as "Uni Electronics Corp". Uniden became a well-known brand in the 1970s by manufacturing and marketing millions of CB radios, under the Uniden brand as well as many for popular private brand labels such as Realistic, Clegg (amateur transceivers), Cobra, Craig, Fanon-Courier, Midland (only certain clone models, originals were made by Cybernet), President, Teaberry, Stalker, Super Star, Teledyne-Olson, Pearce Simpson, Regency, Robyn and many European brands such as Zodiac, Stabo and Inno-Hit. Uniden also marketed CB Radios in the UK under the Uniden and Uniace brands during the late 1970s.


    If I’m wrong, I’m always willing to learn the truth.
     
  11. buddyd157

    buddyd157 Road Train Member

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    i have had at least 2 cobra 29's that were built in the Philippines.

    i still have my 25 LTD classic cobra, but right now, i cannot say what country it was built in, as i am not able to climb stairs.
     
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