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Jim in Idaho

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Jim in Idaho last won the day on April 20 2020

Jim in Idaho had the most liked content!


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  • Gender
  • Location:
    Blackfoot, Idaho
  • Interests:
    Prospecting, machining, equipment design/build, predator hunting, flyfishing
  • Gear Used:
    Whites GM24K, GMT, TDI-SL, DFX. Homebuilt mineral jigs/with auto-feeder, for gems. Designer & inventor & operator of patented "Sweep Jig' (US10159988 B1), Polaris 4 x4 ATV

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  1. Great work, Bentley!!!! I really appreciate your efforts, and the link. Jim
  2. I have no idea why some SL's tolerate the higher voltage, but some do not. Mine seems to tolerate it well, but I started limiting my max voltage to 16.0. My Sadie also works fine at the higher voltage, but I don't find it superior to my Whites 7.5DF. According to Carl Moreland, the SL should tolerate voltages as high as 18.0, but may require a couple of component changes to do that. I know of only one SL that wouldn't work at 16v, and that one was in the UK....maybe the soil there was the problem at higher voltage...don 't know. Jim
  3. I was just metal detecting close to the impact center of the Beaverhead Crater a couple of weeks ago. It's about 8 miles west of where hiway 93 crosses Willow Creek Summit north of Mackay, Idaho. No visible evidence at all, unless you're an expert. Wandered that country for years, back in my fur-hunting days, and nobody back then had any idea that was an impact crater. It's interesting that Idaho's highest peak (Mount Borah) is right on the crater rim. Jim
  4. Be advised that some aftermarket coils will do this, and also some SL's don't readily take to increased battery pack voltage. Juast sayin'. Jim
  5. You're right, as usual, Steve. The frequency thing actually started with flight, and radios. The engineers knew that the laminations in transformers were extremely heavy, and figured out they could get the same performance with much smaller transformers by simply raising the frequency they operated at. The new digital welders take advantage of the same principle, as do the inverter generators.....same results in smaller, lighter packages. Before solid state, the aircraft radios operated at 400hz, rather than the 60 hz of ground-based radios. Jim
  6. I'm thinking, Gil, that a switch for the hi-gain might be a nice feature. Jim
  7. Both D20 and 21 are three-lead diodes. The jumper only goes across 2 of the 3 connections on diode D21. It goes across the bottom 2 connections in the pic, as shown. Also, everybody interested in this mod should understand these are very tiny components. They require a magnifying light, and good soldering skills, with a decent quality soldering station. At least IMHO...LOL I was a radar tech in the Air Force, and doing this mod taxed my skills. I've done 2 of Reg's mods to my 2013 unit, and I recommend them. At some point in then future I'm going to do the jumper across Test Points 2 and 31, too. I wasn't aware of that until Gilbert's post, so a shoutout to him, and a thumbs-up Jim
  8. Bear in mind that on SL's made since 2015 have D20, and D21 removed, and the jumper across the correct 2 legs of D21. This was a factory mod. if you want to perfor4m this mod on your pre-2015 model here's a pic showing which legs the jumper goes across on D21. It also shows D20, and C56, which can be removed. Jim
  9. Many thanks, Carl. I'm not going to get into it that deep. I thought of raising the wattage of R9 because I've a read a complaint that it was getting hot with the raised battery voltage. I haven't seen it in mine, but thought it might start showing up if I went to 21 volts, as in a 5-cell pack. Jim
  10. Carl, I've run mine as high as 16.8 without problems, but now limit the voltage to 16.0, just to be safe. But, I've been thinking of a 5 cell battery pack limited to 20v. Might have to raise the wattage of R9 to dissipate any additional heat. Jim
  11. Boosted packs help, but everybody should be aware that Carl, the TDI SL designer, has stated that the SL will tolerate voltages to 22 volts, but if you're running above 20, you should swap some capacitors for higher voltage-rated caps. The SL does tolerate higher voltages than the standard TDI series, however. Jim
  12. I made a 24" coil for my TDI SL. Works great! Jim
  13. I've never been stranded, in the more than 50 years I've spent in the outdoors. Closest I came was a 3/4 ton Ford 4x4 that had a rebuilt starter fail. I also made the rookie mistake of parking it facing uphill against a wall of brush...REALLY dumb! So, I rolled it backwards until the two track leveled out. Then I had to use the Rokon to pull it around and down to a sloped section of road. All this while alone, I might add. Then I had to use the Rokon to get it rolling, drop the Rokon, unhook the rope, and jump in the cab to get it in gear. Took several tries to sort it all out, but finally got the truck started, the Rokon loaded, and back to the camper. At 72, I doubt I could do that now....LOL
  14. I don't have to worry about it. If the Dodge ever pukes, I'll spend my money finding, repairing, and driving another one of the same year. I will never own, or buy a new outdoor vehicle, unless the morons currently in charge force me to. Jim
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