#43 Tutorial HAM / CB Radio Electronics: How to take a Cobra 142GTL back into service after 25 years

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  • @ΧρήστοςΚαλαφάτης-ε8ε
    @ΧρήστοςΚαλαφάτης-ε8ε 4 ปีที่แล้ว +1

    Your English is fine and your videos are great. You explain very slowly and practically and everyone understands very well. They are really very Educational. Thanks. I'm Christ (GREECE).

  • @dinosworkshop6870
    @dinosworkshop6870 9 ปีที่แล้ว +8

    Because I speak more than one language, I can understand this mans stumbling with words. I had to interact with many cultures and languages at college. My background was science and engineering with a special interest and study in physics. The best and brightest in these fields were from other countries. To this day, because English is my native language I still stumble with words I do not use every day in other languages. So I can identify with what this guy is doing in trying to do in producing these superb videos. While I believe that no ideology should be suppressed and that everyone should be allowed to share all constructive contributions. I deplore mockery and criticism. I feel that most of the subscribers here are pleased with there experience with this mans videos and will continue viewing them and I welcome the chance to interact with them. People of low I.Q. are also welcome, but others should find videos on you tube that are not so technical and refrain from negative comments ....,. Because none are due here. This is another excellent presentation for those of us that pursue can electronics lifestyle and technical excellence. I really like these videos and in defense of TRXBench really hope he keeps contributing as it has terrific educational benefit. Maximum Thumbs Up to this videoblogger!!!!!

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว +1

      Satellite_Guy Hi, your support for me and my channel is really highly appreciated! Thank you very much.

    • @waynethompson8416
      @waynethompson8416 5 ปีที่แล้ว

      I have the highest appreciation for both the quality of these videos as well as the fact that he does infinitely better at English than I could ever do with German! I am upset with myself in that I have never learned another language. The worse one that I ever did try was Hebrew!!! I was so happy that I could count to ten...then was told yeah, if you are talking to a woman! Different words to say the same thing depending on the sex of the person you are talking to??? Dang!
      I have found only 2 TH-cam Channels on Electronics that I respect and enjoy watching...TRX Bench and Mr. Carlson's Lab!

  • @dallasdorrington7449
    @dallasdorrington7449 7 ปีที่แล้ว +1

    I have 2 of these radios and i must say i never use the light bulb test to power them up. One of the radios was a daily user the other had been sitting in a garage for 30 years. Both radios work fine. I did a full restoration on the radio that had been sitting for 30 years and i must say it works like new. I replaced all the electrolytic capacitors (48 in total), then i changed out the very small power wires from 1mm to 8mm and adjusted the internal power supply to 14.2 volts DC then done a full alignment on the radio. It turned out to be a very good transceiver. I replaced the old meter bulbs with Cool White L.E.D.'s and cleaned and re lubed the meters as they were stuck on zero and would not move at all. Cobra 142 GTL radios were made in Japan and are some of the best old rigs still around.

  • @FUNKLABOR_DL1LEP
    @FUNKLABOR_DL1LEP ปีที่แล้ว

    and your old videos are very helpfull - some facts are new and some are known! great pter and thx, 73

  • @gvvq-pi5ml
    @gvvq-pi5ml 9 ปีที่แล้ว

    Congratulation, you are the first person to ever say that bulb resistance when cold is practically zero, I have known this for years...I was car engineer at one time...but no one has ever said this about the bulbs before best wishes Fred in uk.

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      Tom Smith Hi Fred, yeah you was always right and it is very easy to proof. Take an ohm meter and probe the cold resistor of the bulb 73's

    • @gvvq-pi5ml
      @gvvq-pi5ml 9 ปีที่แล้ว +1

      TRXBench Hi Peter yes I done that once a few years ago, obviously around zero ohms, just a piece of thin wire... you can only work out the real resistance really from Ohms law, well as you say...I think that is why most electricity bulbs in your house blow when you turn them on, due to the massive current flow initially..Fred.

  • @karlfell3768
    @karlfell3768 9 ปีที่แล้ว

    One of the best mains voltage protection systems out there. Every lab should have one. It has saved me from shorts a few times. Karl.

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      Karl Fell Hi Karl, yes I fully agree! It saved me as well a few time... 73

  • @johnmiller8678
    @johnmiller8678 9 ปีที่แล้ว

    Very simple and interesting home brew test instrument. It reminds me of the old school electronics classes teaching series and parallel curcuits. I thing I will copy your idea and build one this weekend.

  • @charlieoscar09
    @charlieoscar09 9 ปีที่แล้ว

    Really like your CB repair videos...many thanks and look forward to the next one.

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      charlieoscar09 Great that you like it:-) Thanks for your feed-back!73

  • @RogerT_XRS
    @RogerT_XRS 9 ปีที่แล้ว

    I am from New Zealand and I have been a CB'er since 1980. In the early days, we had to register ourselves and our CB radios to which we were given a license and a local CB callsign to use our radios legally here in New Zealand. CB radio licenses were finally done away with around 83 - 84
    I started out with a "Pye SS140" 11 Channel AM radio, which gave me unfaultering service for several years. In 1984 - 85 I finally bought a Midlands 40 Channel AM radio and retired my Pye SS140 to a box in which I still have.
    I have not fired my old CB to life to this day, I guess I'm too afraid to try incase I blow it up lol.
    During the early 80s, Sideband was not that big here, as most of our country still had mainly AM radios, but by the late 80s, things started to change, more and more people were buying the new (at that time) SSB (single side band) and DSB (double side band) radios pouring in to the country from Australia and the USA.
    I finally did buy a sideband CB radio, a Uniden Grant, which I still have though the LSB/USB does not transmit properly, it is too far off frequency.
    As your country does not use AM radio, perhaps you could persuade your customer to put that Cobra on ebay or somewhere and put it up for sale. Seeing that Cobra sitting on your bench brings back memories, just thought I'd share...

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      +Roger Te Puni Hi Roger, thank you very much for sharing your memories with us! Very nice story, sounds a bit like my own :^) All the best and take care!

  • @plantopguy5
    @plantopguy5 9 ปีที่แล้ว

    Thanks for the videos, very nice of you to share your knowledge with us. I combined my variac and bulb load (switched) along with a voltage and current meter all in one nice housing. Then plug that in a large surplus isolation transformer i came across.

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      plantopguy5 Hi, I'm glad that you like it. Sounds very good your finished project, great!Thanks for your feed back!

  • @williel.morris4492
    @williel.morris4492 4 ปีที่แล้ว

    Thanks, Another Great Video..Excellent!!

  • @chrisparnell5702
    @chrisparnell5702 9 ปีที่แล้ว

    Another great video.... Excellent advice!
    Thanks, Chris

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      Chris Parnell Hi Chris, thank you very much. Yeah is a nice and easy week end project...

  • @blairbatty
    @blairbatty 6 ปีที่แล้ว

    I built one of those electric bulb current limiters several years ago; they are really useful. I used a 100 watt and 60 bulbs.
    I think you will find it more useful if the switches are wired in parallel with the lamps, rather than in series; and the lamps in series with each other.
    Sincerely
    /blair

  • @rayfalcone6897
    @rayfalcone6897 5 ปีที่แล้ว

    Hello Peter,
    another great video my friend,thank you for sharing.i just can't get enough of them...i subscribe and like all of them.

    • @TRXLab
      @TRXLab  5 ปีที่แล้ว

      Glad that you like my videos Ray! Thanks for feed back!

  • @roarkshsha
    @roarkshsha 6 ปีที่แล้ว

    Very informative video. Guess what I will be building soon? Nice presentation.

    • @TRXLab
      @TRXLab  6 ปีที่แล้ว

      Thanks Roark Cheers

  • @DonDegidio
    @DonDegidio 8 ปีที่แล้ว

    Peter,
    Great video. You sent me to this video about a month ago when I inquired about bringing a Yaesu FT901DM back into service.
    I don't have a fancy setup as yours with the switches, but I just rewired a 6 outlet power strip (3 on each side) so that one set of outlets need a bulb plugged in to complete to hot side circuit to the other 3 outlets. I will just plug in or out the bulbs as needed. I will eventually make a unit with the switches included.
    WB3BJU

    • @TRXLab
      @TRXLab  8 ปีที่แล้ว

      +Donald D'Egidio Very good Donald... the most important thing is that it works no need to be fancy.. 73

  • @psionl0
    @psionl0 6 ปีที่แล้ว +1

    Do you still get incandescent light bulbs in Germany? Here in Australia you can only get them for special appliances like refrigerators or sewing machines.
    You should stress that CFLs and LED bulbs can not be used as a substitute.

    • @TRXLab
      @TRXLab  6 ปีที่แล้ว +1

      Yes we have the same situation here. You should put some light bulps on storage...

  • @iw0hex
    @iw0hex 9 ปีที่แล้ว

    Hi P. To use normal lamps is a great idea !!! Thanks for your video again. Best 73s de IW0HEX Pasquale.

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      Pasquale IW0HEX Thanks Pasquale! 73's

  • @technos123
    @technos123 9 ปีที่แล้ว

    Your English is fine and your videos are great. Please keep making them they are really enjoyable and very educational. If I could speak German as well as you speak English I would be very happy.

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      technos123 Hi, thanks for that positive feed-back :-)

    • @dinosworkshop6870
      @dinosworkshop6870 9 ปีที่แล้ว

      Profs to techno123. terrific response

  • @jameslane4206
    @jameslane4206 9 ปีที่แล้ว

    Best description I have seen on dim bulb tester.I made one from old table lamp that has a switch so I can use as bench light. It just shorts out the bulb. How would you make a tester for 12 volt dc radios Like mobile cb or 2meter ham to protect them and your power supply if a short or low resistance happened while checking out?. Jimmy in USA

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      James Lane Hi Jimmy, thanks for your feed-back. Well for 12V DC radios it is even easier. My DC power supply is short protected itself and I can adjust the maximum current in advance. So its works same way as the light bulbs.

  • @Chrysiotis
    @Chrysiotis 9 ปีที่แล้ว

    Wooohooo,another great video!

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      Chrysiotis Hi, thanks for your feed back :-)

  • @stargazer7644
    @stargazer7644 7 ปีที่แล้ว +1

    Now in the USA since 2014 they essentially banned 100, 60 and 40 watt tungsten light bulbs and they are hard to find. You might be able to find some halogen bulbs, but they have to have 27% less wattage.

    • @TRXLab
      @TRXLab  7 ปีที่แล้ว +1

      Yeah we have the same issue here but I have some in store hope that it will be okay for the next years. Thanks for watching 73

  • @dennisqwertyuiop
    @dennisqwertyuiop 9 ปีที่แล้ว

    good work
    I made one with 4 bulbs and 4 switches 25 50 75 100 watts

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      ***** Hi Dennis, yes that is even better, because you can lower the resistor more. Good decision..

  • @aslerunarborgersen5175
    @aslerunarborgersen5175 7 ปีที่แล้ว

    Very nice video. I will certainly build one of these lamp-protectors.......if i can find old bulbs he he. I think i have 60w and 40w at home, but i may struggle a bit to find 100w.

    • @TRXLab
      @TRXLab  7 ปีที่แล้ว +1

      Thanks for watching and good luck with your project 73

    • @aslerunarborgersen5175
      @aslerunarborgersen5175 7 ปีที่แล้ว

      Thanks. 73 de Asle

  • @michaelrawlings8908
    @michaelrawlings8908 3 ปีที่แล้ว

    I have a cobra 148 gtl that will not key up can you help please?

  • @wadehicks9270
    @wadehicks9270 9 ปีที่แล้ว

    Good info great job

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      +wade hicks Again thank you! 73

  • @MrBugsier5
    @MrBugsier5 8 ปีที่แล้ว

    you can also mount a fm board in it, they sell them in Germany..., a recap in most times and aligning woul be all.

    • @TRXLab
      @TRXLab  7 ปีที่แล้ว +1

      Hi, well never searched for a FM board. Thanks for the info. The CB market here is very special..there is limited interest in a cobra.. Thanks for watching 73

    • @MrBugsier5
      @MrBugsier5 7 ปีที่แล้ว

      I know, i'm dutch, we have te same cb laws as in Germany... lol

  • @expressmail9977
    @expressmail9977 8 หลายเดือนก่อน

    I just acquired an old 142. It's rougher than a night in jail.. the meter bulbs were working yesterday now they are out. Anybody know where to get replacement bulbls cheap?

  • @rolftammen4482
    @rolftammen4482 5 ปีที่แล้ว

    Si Si,and germans viewing his Videos too

    • @TRXLab
      @TRXLab  5 ปีที่แล้ว

      LOL very good like it :^)

  • @idrinkpowersteeringfluid
    @idrinkpowersteeringfluid 9 ปีที่แล้ว

    Good video! There don't seem to be a while lot of really good quality informative CB videos like yours on TH-cam.

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      bushwood4568 Hey, thanks a lot for your feed-back

  • @expressmail9977
    @expressmail9977 8 หลายเดือนก่อน

    Nobody can teach like a German.

  • @wheelholder12
    @wheelholder12 9 ปีที่แล้ว

    the question is why not restore it and convert it to an FM channel radio at the same time ?

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      mike charette Hi Mike, well yeah but it is always a question what one would like to invest. In Germany people do not usually restore an old radio. They prefer to buy it new. To covert it to FM makes it even more cost intensive.

  • @aslerunarborgersen5175
    @aslerunarborgersen5175 7 ปีที่แล้ว

    And here is my finished product. I miss a 100w bulb, but that i can connect later. Thank you for the idea. ( in the background you see my 1000VA separation transformer i build, which i connect my amateur radios to, and i have a smaller homebrewed separation transformer for elctronic works too). 73 de Asle facebook.com/photo.php?fbid=1321864487917632&set=a.391802174257206.1073741825.100002822802211&type=3&theater

  • @wheelholder12
    @wheelholder12 9 ปีที่แล้ว

    he could put it on ebay???

    • @TRXLab
      @TRXLab  9 ปีที่แล้ว

      mike charette yes of course, but it is not my decision.....