50000 Watt Power Supply Repair

by admin on 09. Aug, 2010 in Power Supply Repair

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50000 Watt Power Supply Repair AM Transmitter

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21 Responses to “50000 Watt Power Supply Repair”

  1. AllAmericanFiveRadio 09. Aug, 2010 at 6:29 am #

    Thanks snakerivercycles

  2. AllAmericanFiveRadio 09. Aug, 2010 at 6:57 am #

    Raleigh/Durham NC, 1030 AM, day time station.

  3. snakerivercycles 09. Aug, 2010 at 7:04 am #

    Another fun video, thanks for posting these. Where is this station located, what’s the transmit frequency, etc? Sometimes I can pick up these am stations from quite a distance at night, occasionally up to 1200 miles.

  4. AllAmericanFiveRadio 09. Aug, 2010 at 7:39 am #

    Glad to hear you are lots of flying. It is great fun!

  5. AllAmericanFiveRadio 09. Aug, 2010 at 8:37 am #

    Hey Ron,
    I must admit that I do pay close attention, no second chances with 50,000 watts. I hope you-all are doing well also. Sorry to hear about Waylon and Willie, sounds like they lived up to their namesakes. I just got in from field day, HOT, HOT, HOT!!!!!
    Rick

  6. Ronbob59 09. Aug, 2010 at 8:57 am #

    WOW, Rick. That would sure leave a mark. I wouldn’t get near 50,000 watts never mind try to work with it. My old tube ham radios have 900 volt transformers and they scare me to death.
    Hope you are well and enjoying the summer. I’m doing lots of flying and taking care of our horses these days. At 62 I’m still able to shoe them so I guess I’m good. We got rid of Waylon and Willie. They grew up to be real pests so we gave them to some friends. Take care and keep the videos coming…
    Ron

  7. BadChizzle 09. Aug, 2010 at 9:51 am #

    Sorry,

    I’m sure it’s awesome to know you anyway!

  8. BadChizzle 09. Aug, 2010 at 10:45 am #

    If I were that guy, I would have called you too! I would say ” come on over and get some shots of the repair.” then knowing you, I could sit back and watch you figure out what was wrong and fix it. Then I’d call my boss n say, ” yeah, I got it all figured out n up n running.”

    I’m sure it’s awesome to know you when things don’t wanna work right!

  9. AllAmericanFiveRadio 09. Aug, 2010 at 11:36 am #

    All these applications are amazing. Could not have even dreamed of this stuff back in High School.

  10. joernone 09. Aug, 2010 at 12:34 pm #

    Rick,
    Sometimes modern technology makes electronic repairs very easy. Some vintage radios are more difficult to fix.
    Cool vid…I especially liked the blinking panel. I finally got of the wallet and ordered the PowerDirector 8 video editing program. Supposed to arrive in three days. Can’t wait to play around with it and maybe make my Youtube vids a bit more interesting.
    Thanks.

    Regards,
    John

  11. AllAmericanFiveRadio 09. Aug, 2010 at 1:19 pm #

    No tubes this has 48 RF transmitters that are combined together.

  12. AllAmericanFiveRadio 09. Aug, 2010 at 1:40 pm #

    Yep, there power supply diodes, high current. The unique stuff is in the RF circuits.

  13. AllAmericanFiveRadio 09. Aug, 2010 at 2:16 pm #

    Thanks ntjbjhq

  14. AllAmericanFiveRadio 09. Aug, 2010 at 2:39 pm #

    I don’t remember what the voltage is but the current that all 48 units draw is about 250 amperes when the transmitter is at 50,000 watts. I may have shown that in the first video on this radio station. The filters are in each of the 48 RF units mostly. There are many choke coils in the bottom of the bays and there are a few more filter caps in other parts of the bays too.

  15. douro20 09. Aug, 2010 at 2:56 pm #

    @CameramanLink
    It’s been many, many years since they powered these things with tube rectifiers. The diodes they use in these things are the same type used in arc welders.

  16. douro20 09. Aug, 2010 at 3:05 pm #

    I’m guessing that this transmitter has two Eimac 4CX25000A PA tubes and separate supplies for each.

  17. douro20 09. Aug, 2010 at 4:04 pm #

    I’ve seen those types of diodes; they came out of a welder.

  18. ntjbjhq 09. Aug, 2010 at 4:35 pm #

    Love the video, would love to see more like it! Interesting stuff for sure!

  19. CoolDudeClem 09. Aug, 2010 at 4:52 pm #

    The awesome power of nature strikes again! It’s good there’s people who can repair things like this. I think this is what some people need to power their computers when they have all that crazy stuff they put inside them.

  20. CameramanLink 09. Aug, 2010 at 4:53 pm #

    I’ve never seen a power supply like that before. I thought for a transmitter there would be tube rectifiers, but I suppose there are silicon diodes that handle the hefty current loads. How many amps and volts does it put out? Where are the filter capacitors?

  21. Delishful 09. Aug, 2010 at 5:23 pm #

    Interesting stuff, thanks!

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