• You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
  • Click here to find out how to win free radios from Retevis!

Search results

  1. DoctorAudio

    TRC-465 for $30

    Great little radio, maybe a little smaller than a PC-122..
  2. DoctorAudio

    Dynamic mike element

    Too bad Condenser elements need that pesky power supply: https://www.ametron.com/shure-r184b-supercardioid-cartridge
  3. DoctorAudio

    Xtals needed

    It was a travesty when International Crystal Manufacturing (ICM) of Oklahoma City announced in early 2017 that they were closing their doors after 66 years in business. Excellent crystals, great customer service and if they didn't have it, they would cut you one. R.I.P. ICM...
  4. DoctorAudio

    Fat Boy 4 pill gift from neighbor

    The transistors are Motorola "super" SRF3775's. Select, high beta MRF455 drop-in upgrades rated at 75 watts. That box will rock with just a single final radio with all of that gain.
  5. DoctorAudio

    Tram xl 7 clarifier mod

    Remove R228 Find the wire from the center leg of the clarifier potentiometer and unsolder it from the main board. Resolder it the the junction of L203/C230/R222 on the main board. This bypasses the RX-TX relay.
  6. DoctorAudio

    President Washington 878 Relay.....

    Ken's electronics was the last place you could get them new but even he hasn't had them for 15 years, The original part number was MX3P-12VDC. Looks like there are some on eBay right now...
  7. DoctorAudio

    Carl Built

    Shadetree amps, laying down that RF blanket.. :)
  8. DoctorAudio

    Capacitors for Amplifiers

    https://www.icamanufacturing.com/capacitors/brass-tuning-adjustable-capacitors
  9. DoctorAudio

    Base Station Antenna Interaction

    I didn't think of that but I know what you mean. My terrible spine keeps me from doing many things my brain would like to get done. To be 20 again.... ;)
  10. DoctorAudio

    Base Station Antenna Interaction

    You can rent cement mixers.
  11. DoctorAudio

    Carl Built

    100 watts dead key out max (whatever dead key in it takes to get 100 watts) 80 watts peak drive max Both with amp set to high Max 1.5 SWR
  12. DoctorAudio

    Oh Man My Head Hurts From AM

    To be clear, on my post I wasn't implying that dave457 and w9cll were stuffy. I was jokingly inferring that the CB camp and the HAM camp were both stuffy.
  13. DoctorAudio

    Oh Man My Head Hurts From AM

    They are both stuffy.. ;)
  14. DoctorAudio

    Death of a Crossbow (antenna)

    I had one of those back in the day. It got out equally to a Super Big Stick but only handled about 200 watts. If I remember correctly it had reverse threads in the middle where it screwed together so you couldn't screw on alternate whips like you could with the Shakespeare.
  15. DoctorAudio

    Help needed Air command superscope CB-640

    All of the Superscope mobiles (CB-140, CB-340, CB-640) use the same PLL board. The board is double sided and has several feed-through eyelets that connect the top traces to the bottom traces. They are notorious for losing connection. 9 out of 10 times that one of these radios is having...
  16. DoctorAudio

    Cobra 32XLR Dead Key

    There is no handy AM Power adjustment on the 32XLR but you can lower the dead key while keeping peak power by using a dropping resistor/parallel cap on the driver (like is done on the 29LTD Classic). Remove R50 and experiment with the value until you get the desired dead key. (it will probably...
  17. DoctorAudio

    President Grant DX PC-999 Noise ?

    Hard to find a clean datasheet for the 1182H. On the one I did find it looks like pin 1 is the input. Lift pin 1 and check if both the receive audio goes away (verifying that pin 1 IS the input) and see if the popcorn noise remains. If the noise remains the IC is probably bad. Once in awhile...
  18. DoctorAudio

    President Grant DX PC-999 Noise ?

    I have found that a failing audio chip can cause snapping/popping/white noise that's not affected by the volume or squelch. If it has a TA7222AP IC, lift pin 4 from the trace and check if the noise remains. If you still hear it, the audio IC needs to be replaced. If it goes away, it must be...
  19. DoctorAudio

    Bricked my 959 final version

    Yes, that mod has been posted for more than a decade. Definitely from the BJT era.