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  1. LeapFrog

    Curious: What is your best solution for solder mask removal?

    I've picked up a few adjustable fibergass tipped "pens", a few twists exposes fresh fibers after they've worn down.
  2. LeapFrog

    Series Pass Modulator for D.I.Y. Hi-Fi & Asymmetry

    Can we all agree that sometimes we disagree; no need for a p*ssing match here gentlemen. ;)
  3. LeapFrog

    Cobra 29 LTD Frequency Mod (+Counter)

    The same concept can be applied to Cobra 1000GTL! RX: TX.
  4. LeapFrog

    Cobra 29 LTD Frequency Mod (+Counter)

    This is just the basic idea. Credit should go to CBphreaker whos excellent work and kind mentorship brought these mods to light. A.) Disconnect the 10.240MHz signal from the TX mixer. Build a 10.695MHz oscillator and inject this signal into the mixer instead. Add a SPST switch (tied to...
  5. LeapFrog

    Realistic TRC 474 seeking advice on irf520/schematic

    Perhaps that bias voltage is too high, should be about 3.7 V for the irf520.
  6. LeapFrog

    Operating CRT Oscilloscope from Gasoline Generator

    It works, straight off the generator..
  7. LeapFrog

    Operating CRT Oscilloscope from Gasoline Generator

    Hello all, I am Considering Operating a CRT Oscilloscope from a Gasoline Generator. Are there any precautions I should be taking to avoid potential E.M./R.F. interference contaminating my signal sample? Would a D.C. battery bank and full sinewave inverter help me in this regard? Would a...
  8. LeapFrog

    Volting a Cobra 148 GTL final?

    Allow me to not explain the technical side.. The audio loses it's punch after this mod, but the meter sure "swangs"...
  9. LeapFrog

    Negative Peak Compression boards for Cobra 29

    Judgeing by the info in his post alone I'm going to go ahead and say this isn't an NPC mod. That's all marketing hog wash as far as I can tell... It's the variable jp36 mod made up in SMD..
  10. LeapFrog

    FCC should just open up 11meters as a Citizens experimental band.

    Yeah no worries Bow, I used the KF5INZ "Easy Digi" Soundcard interface purchased on eBay. The radio has an RS-232 Serial Connector mounted on the back panel, this connects to a few spots on the easy digi PCB tucked away inside. An onboard switching circuit connects to the radios p.t.t. TX...
  11. LeapFrog

    FCC should just open up 11meters as a Citizens experimental band.

    Here is an early G.E. Mobile, standard A.M. 40 Channel Radio Transmitting a SSTV signal with an easy-digi and RS-232 to USB adapter. The image can demodulated using an RTL-SDR and freeware. (experimental testing performed using an r.f. dummy load.) I.m.o. F.M. and limited data should be...
  12. LeapFrog

    For education..... what was "Sound Tracker" ?

    Thread: https://www.worldwidedx.com/threads/cobra-25-wx-nw-st-lowering-the-deadkey-question.211315
  13. LeapFrog

    I like finding coincidence, like for instance, finding the 2020 coin has bats on it...

    I like finding coincidence, like for instance, finding the 2020 coin has bats on it...
  14. LeapFrog

    Maiden's Head, Bravo P50G C

    Maiden's Head, Bravo P50G C
  15. LeapFrog

    Series Pass Modulator for D.I.Y. Hi-Fi & Asymmetry

    More than one way to lower your carrier, I.m.o. this is the best "carrier suppression technique" floating around right now for high level modulated radios. {Granted a form of limiting must used!} "Why Punch is more important than power in a CB" "Punch through Loud and Clear; with a Cobra!" I...
  16. LeapFrog

    https://youtu.be/md_cGDwAwO0

    https://youtu.be/md_cGDwAwO0