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Recent content by Shadetree Mechanic

  1. Shadetree Mechanic

    Astatic AST-878DM Desk Mic Electret Element Upgrade

    I didn't get any pictures of the element, but it goes in super easy. Basically you take the old dynamic one out, then put the electret under it. The electret pushes down into the foam, and it all goes back together like normal. This also keeps you from losing the dynamic one incase you ever want...
  2. Shadetree Mechanic

    Astatic AST-878DM Desk Mic Electret Element Upgrade

    Power is going to the element through a 1K resistor. (If you dont use a resistor, you will blow the tiny diode on the back of the board) The two electrolytic caps are to isolate the amplifier board from the element power. They are wired together negative to negative, but a non polarized cap...
  3. Shadetree Mechanic

    Astatic AST-878DM Desk Mic Electret Element Upgrade

    The new element is powered from the PTT switch where it switches the 9v battery power to the amplifier board. You can see the red wire attached to the bottom row of double pins at the bottom right of the board. The two pins on the bottom left were to switch the audio wire on and off, but this...
  4. Shadetree Mechanic

    Astatic AST-878DM Desk Mic Electret Element Upgrade

    I bought one of these a while back because it is one of the few desk microphones still available. Unfortunately I found that the audio has no bass. Great for DX, but not what I was looking for. The solution was to put an electret element from an old telephone handset in it. The electret elements...
  5. Shadetree Mechanic

    11 meter is very quiet?

    Copying the mail and made a contact with Texas off the side of my beam with the house in the way. And that's with 40w on an Ares 2! Don't forget to take the batteries out of your unused power microphones.
  6. Shadetree Mechanic

    Home January New Year's Giveaway: 3 Retevis Ailunce HA1UV Radios!

    Yeah, maybe the threads for contests could be locked when they are done.
  7. Shadetree Mechanic

    What have you done today to be prepared?

    Silver is over $58 oz right now. Best bet now is to buy it on its way up. Check out the link I posted above for Kitco, I am currently buying gold and silver for my son with money he got from an insurance settlement. Kitco has bars and coins in all different sizes.
  8. Shadetree Mechanic

    Aquario RP70 “Mini” AM/FM/SSB Radio With NRC

    No. The radio is now my station monitor for the back workbench...
  9. Shadetree Mechanic

    Aquario RP70 “Mini” AM/FM/SSB Radio With NRC

    IF it's Chierda, I hope the noise reduction works. When I got my S890, it was a listed feature, but not in the menu. I asked the guy and he said it was for future...
  10. Shadetree Mechanic

    Home January New Year's Giveaway: 3 Retevis Ailunce HA1UV Radios!

    Sorry, this contest is closed. This was from January earlier this year.
  11. Shadetree Mechanic

    Pop-ups, pop-downs, ads and more ads

    Wait, if you don't get adds, then you won't know what to buy... :rolleyes:
  12. Shadetree Mechanic

    Test this.

    It's working, I've got you wall to wall and tree top tall!