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Recent content by 3puttbob

  1. 3

    What power supply

    Hi All I want to use my 500 watt polomar amp on my base station (Cobra 2000). Basic math shows a 50amp power converter is what I need. Anyone have suggestions as to what power supply? Would a battery charger work(sounds real hillbilly, I know)? I have a nice 120v tube amp now, just...
  2. 3

    Cobra 2000 gtl NO Modulation

    I checked eBay and there are some for a couple bucks less but...... The one at Micro looks like the best deal. You're right about the choices, I think I'll just order one. It acts just like the one I tried earlier that was wired wrong so I rechecked that and it is correct. This mic used to...
  3. 3

    Cobra 2000 gtl NO Modulation

    Oh wow. I never knew that. This was stored in a shed subject to 120 deg. for 12 years. Guess I'll have to shop around. Thanks unit248.
  4. 3

    Cobra 2000 gtl NO Modulation

    Thanks for the support guys. I decided to try the hand held mic one more time but, checked the wiring first. Oh crap, the red and blue were reversed (Thanks for the wiring code Robb). Then I remembered it was wired for another radio. After rewiring, my Cobra works. This means the D-104...
  5. 3

    Cobra 2000 gtl NO Modulation

    Well, it was time to dig out the old base. After 13 years in a box I wanted to try the old Cobra. Sadly, there is no modulation. The mod needle shudders slightly and just sits there. Listening from another radio all you get is a dead key. Guess that means the finals are ok. Everything else...
  6. 3

    Whip it good

    If you hold a steady modulation and re-calibrate the swr, then flip to test, You get what you started with 1.2:1
  7. 3

    My Big Stick

    I used a Super Big Stick about 15 years ago, took everything down and now in my second childhood want to install it again. So, I dug out the Cobra 2000 and used new coax (cheap rat shack). Of course the Big Stick is fiberglass...lots of little fiberglass flakes. Anyway the SWR swung all the way...
  8. 3

    Whip it good

    The 2 to 14 watt swing made a difference in modulation clarity. My SWR swings to 1.6:1 when I dead key at 1.2:1. I took off the whip and put on my old penetrator type coil. Match is fine but, still need the 10" extension. Must be the cab interference.
  9. 3

    Whip it good

    Everyone's suggestions have been most helpful. I shortened the bracket for strength. I added 2 ground straps underneath the mount area from bed to frame and frame to cab. I removed the spring. I have an SWR of 1.4:1 on 40 and 1.6:1 on 1. Which makes me tempted to add the spring but, NOT...
  10. 3

    Whip it good

    Agreed about the match. If I had a 1.8, evenly I wouldn't worry about it. The bed is all steel but has a bed liner (always wondered about that interfering with the ground plane). I have a swing kit in it but, have it adjusted to a 2 or 3 watt dead key and there's no modulation when I check...
  11. 3

    Whip it good

    Hi Doc Did that. Tried to avoid extra hardware. When I did the match climbed to 2.5:1 on the low channels. Don't see that condition too often. Usually too long.
  12. 3

    Whip it good

    The 102" whip is an icon in the CB world. I used one 20 years ago with great results (and a few broken fluorescent tubes at the gas station). Anyway, have it back on my Prerunner now but, am experiencing something. Had to add a 10" extension and a 4" spring to bring the match (tested on 2 swr...