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Identifying Counterfeit RF Transistors in CB Radios: 2SC1969, 2SC2166, MRF477, & More

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  • #1 16462736
    Anonymous
    Level 1  
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  • #2 16463863
    SP5IT
    VIP Meritorious for electroda.pl
    http://www.eleflow.com/ produces 1969 and 2312 and many more, they work as needed. You would have to pogooglać what they look like.
    M.
  • #3 16502393
    Anonymous
    Level 1  
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  • #4 16548199
    gonsiory2
    Level 12  
    Hello everyone, I sell these transistors on, all ..... and ol ..... portals, what can I say about the transistors sold, in auctions writing that this is the original transistors they work as in the catalog notes, as it is supposed to have 20W, it has them, the transistor transistor is not equal to 10pcs works the same and the next 10 similarly, e.g. 19-21W, 5pcs has a gain, e.g. 100 and 5pcs, 90 or 110, so the difference will automatically be 0.2 watts or , 0.5 W, the circuits can work with slightly different capacities and there will also be a small difference in watts
    Original transistors hmmm, as many as I had in the workshop, I can say that the originals are those that have parameters identical or similar to the catalog note, because there are really no originals that 15-25 years ago someone produced their appearance is different or identical.
    When writing about the tests, they were and are made to make sure that such a transistor works correctly / badly.
    Regards, Rafał

    Moderated By c2h5oh:

    Dear colleague. Start selling ORIGINAL transistors instead of the "original" ones. Maybe it will be better? Remember: Transistors may be ORIGINAL and not "original".

  • #5 16548234
    c2h5oh
    Moderator
    gonsiory2 wrote:
    ...
    Original transistors hmmm, as many as I had in the workshop, I can say that the originals are those with parameters identical or similar to the catalog note because there are really no originals that someone produced somewhere 15-25 years ago ...


    My friend. What is original is original. Any substitutes that look identical and have "identical" parameters will NEVER be the original.
    What you do and write is simply deliberately misleading.
  • #6 16548539
    gonsiory2
    Level 12  
    Sorry for spelling "original"
    The moderator is right, the original one is a painting by famous painters (it is the only and only one), and the transistor produced in series for 20-30 years has not changed anything? It would be fun, but the reality is different. I greet everyone
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  • #7 16548630
    Anonymous
    Level 1  
  • #8 16548699
    c2h5oh
    Moderator
    Colleague gonsiory2 does not want to or cannot understand what ORIGINAL means.
    Please find attached the datasheet for the original TOSHIBA SC 2075 Transistor 2.
    How do these parameters relate to your colleague's announcement?
    Please note two parameters: dissipated power and output power. What the transistor can "give" to the load is the OUTPUT POWER described in the note as "power output" (Po). Please see the note how much it is.
    What is power dissipation I will not explain, but it is not the power that this transistor can "give" to the antenna.
  • #9 16549015
    gonsiory2
    Level 12  
    Mr. Novile, I think I will do a demonstration lesson what 2075 can do because 5W strives for it, maybe the transistors inserted by him seem so much, or maybe it was about a specific uniden radio because it probably has so much in the standard. I did not do the exact tests easy and the modification of the radio consisted in changing to other values 1 or 2 resistors and capacitors, and probably 1 diode. Gentlemen, I also have 1/4 painted basket 2078 and mrf477. If I have the will and free time, I will take a photo or make a video of the action, e.g. 2075

    Here are some photos taken by a certain gentleman on request after modification and before the Onwa mk3 radio. Well, but here you can not see any specific power level, etc., etc., but only as an illustration. Regards and not nervous, gentlemen.

    before modification:
     Identifying Counterfeit RF Transistors in CB Radios: 2SC1969, 2SC2166, MRF477, & More

    after :
     Identifying Counterfeit RF Transistors in CB Radios: 2SC1969, 2SC2166, MRF477, & More

    after modulation:
     Identifying Counterfeit RF Transistors in CB Radios: 2SC1969, 2SC2166, MRF477, & More
    Sorry for the spelling and for offending someone
  • #10 16549246
    Anonymous
    Level 1  
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  • #11 16549273
    gonsiory2
    Level 12  
    Well, this is all bad for you, the 50% meter cheats and the calculations are done now you need to shoot a movie to prove something, the first photo I had at hand is not enough, I know that he would like it, a simple solution 2 resistors and capacitors (not a jumper) diode change on a quick schottky it is such a quick modification, the analog meter (pointer) also showed this, because the digital meter at W.cz goes crazy sometimes.

    and a few more photos of transistors and parameters, I hope you can see what you need to prove in a simple way:

     Identifying Counterfeit RF Transistors in CB Radios: 2SC1969, 2SC2166, MRF477, & More

    Hfe 79 on others from the same package similarly 78-81

     Identifying Counterfeit RF Transistors in CB Radios: 2SC1969, 2SC2166, MRF477, & More

    SANYO

     Identifying Counterfeit RF Transistors in CB Radios: 2SC1969, 2SC2166, MRF477, & More

     Identifying Counterfeit RF Transistors in CB Radios: 2SC1969, 2SC2166, MRF477, & More

     Identifying Counterfeit RF Transistors in CB Radios: 2SC1969, 2SC2166, MRF477, & More

     Identifying Counterfeit RF Transistors in CB Radios: 2SC1969, 2SC2166, MRF477, & More

     Identifying Counterfeit RF Transistors in CB Radios: 2SC1969, 2SC2166, MRF477, & More

    May this measure also not show only 50%. Regards Rafał
  • #12 16552437
    chisel
    Level 27  
    I must add from myself that measuring the gain of these transistors with such a multitester does not make sense. In addition, 9W carrier - about 16W with modulation, so it turns out that the modulation depth after such a treatment is not even 50%. So very shallow. Sometimes about 6W of the carrier can be squeezed out of a classic cymbalrad, but it also makes no sense. Then 20W in PEP is obtainable. But the most important thing is to give these 4W at 27MHz.
  • #13 16552946
    c2h5oh
    Moderator
    Dear colleagues. Enough of these scuffles. I can see that no one will convince anyone.
    Time to sum up the discussion:

    The transistors mentioned by the author of the topic are not original, so they are fakes or, if you prefer, coloring books.

    Everyone has free will and can put whatever they want to their radio. Maybe you can buy such transistors or not. Everyone has the right to ask on the electrode how to repair the radio after such modifications. We will always help :) .

    I close the topic. Of course Author subject has the right to reopen it at any time.

Topic summary

Discussion centers on the identification of counterfeit RF transistors in CB radios, specifically the Mitsubishi 2SC1969, 2SC2166, 2SC1971, RD15HVF1, Motorola MRF477, and SANYO 2SC2078. A seller named Rafał is reported to be offering these transistors, claiming they are original and tested, but users express skepticism regarding their authenticity based on visual evidence and performance claims. The conversation highlights the importance of distinguishing original components from substitutes, with participants sharing insights on testing methods and the implications of using counterfeit parts in radio applications. The consensus is that the transistors in question are likely fakes, and users are encouraged to be cautious when purchasing such components.
Summary generated by the language model.
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