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  • Users: Higgler
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  1. Higgler

    Adhesive to handle extreme cold, but one I can melt at about 75C

    I have a RF cable placed inside a tube which blind mates with the mating connector located on a back wall, and It's difficult to secure the cable, I can only push it in, no mechanical connection other than tynes and spring blindmate contact. I don't want the cable to move during travel. I'm...
  2. Higgler

    Epoxy suggestion for Aluminum to Aluminum bonding?

    We have a hard-anodized aluminum 6061 tube (5" long x 1" diam.) to bond to a pair of 1 inch wide U shaped clamps across the tube at each end. The clamps hold the tube to a flat metal surface of 6061 aluminum. The clamps are machined out of untreated 5052 aluminum. Need a tough epoxy for a room...
  3. Higgler

    Air France crash?

    Now that pitot tube icing has been confirmed, were the pilots pulling up to slow their speed? Why don't pilots carry an aircraft capable GPS with them in the cockpit to see their ground speed? I say aircraft capable because one pilot I knew bought a $120 GPS that had a software load which...
  4. Higgler

    Change a cell color based on the number in the cell

    I'd like to paste a set of data (an array of data) to a worksheet and have it automatically change the color in each cell of the worksheet to show pass fail and close to spec. i.e. a quick color chart. Hence a large table of measured data in one worksheet can be compared to the spec...
  5. Higgler

    SatCom on-the-move 7.2-8.4 gHz electrical experience

    Anyone here been involved in SatCom transceiver design in the recent past. Looking for some answers and guidance on receiver technology for processing satellite signals in the 7.2-8.4 gHz band for on the move vehicles. Thanks
  6. Higgler

    SatCom on-the-move 7.2-8.4 gHz electrical experience

    Anyone here been involved in SatCom transceiver design in the recent past. Looking for some answers and guidance on receiver technology for processing satellite signals in the 7.2-8.4 gHz band for on the move vehicles. Thanks
  7. Higgler

    Sensing lift on a wing

    I have a proposal that needs to sense the forces on a wing due to air turbulence which either enhances or degrades wing lift. If I placed many sensors on top and bottom of the wing measuring the force applied to these spots (capacitance change due to air pressure, not G force acceleration), can...
  8. Higgler

    Cube Sat program

    has anyone been involved in making a Cube Satellite., they are tiny 10 centimeter cubes (2.5" on a side)? There's a program requesting low frequency antennas of very high gain at 300 mHz and I'm curious how one would attach a spring loaded antenna to these cubes, or what the mechanism to...
  9. Higgler

    Piper Comanche 260 fuel tank switch problem/operation

    Sunday, a Piper Commanche 260 flew over me on the golf course and sputtered in my backswing, I pushed the ball right. He had a rough landing on the 101 freeway while I landed in the rough too (thankfully the pilot and I were both uninjured, as I parred the hole). The pilot overhead was at about...
  10. Higgler

    loading cal kit data from floppy into 8753 analyzer

    has anyone done this and could give me a quick overview. I've looked it up on Agilents website, but it's not clear how to use the floppy disk. seems like it should be simple, and it is on the 8510, I've done that recently. But the older 8753 isn't that simple. thanks, kch
  11. Higgler

    acoustic sensor efficiency

    Can anyone suggest an acoustic sensor reference. We are about to implement an array of acoustic air sensors in a housing and I'd like information regarding improving/optimizing sensor efficiencies. I'm wondering if sensors should be isolated in the air, or maybe potted in the housing, i.e...
  12. Higgler

    soldermask thickness control on PCB's

    We have a company that uses a silkscreen process to apply a soldermask Taiyo BN4000. They state thickness control from 1/2 mil to 1.5 mil due to the silkscreen process. We'd like a tighter control (I know, that's picky, read on). Question 1) Does this sound like a normal thickness control...
  13. Higgler

    parabolic antenna manufacturers

    Does anyone know a source for parabolic antennas. To be used on an outdoor test range, high wind areas. I found Andrew and MITechnologies. Haven't asked MITech yet, but Andrew won't sell the reflectors without buying the feeds, we'd like to purchase reflectors only. Any hint if Andrew makes...
  14. Higgler

    electric motor efficiency

    A question on improving the efficiency of electric motors, either dc or ac motors. While visiting a university last year, I was shown that flowing ferrite particles in a tube through an inductor changes it's inductance. Most people realize that varying the magnetic core internal to any...
  15. Higgler

    Metal detector circuit, low power

    Does anyone know of a low power metal detection device. We'd like to put this in a parking space mounted in a metal box on the ground, and when a car moves into the space, sense that a car is present. It has to be located outside in the rain and snow, sleet and oil (from cars leaking). It's a...
  16. Higgler

    lightning protection systems

    Is anyone familiar with lightning warning protection systems. My brother is a golf pro in Florida and they just added a Thorguard systems that went off at 7 am and didn't give the all clear until 2 pm and no lightning strikes occurred. Just curious if there is someone with expertise out there...
  17. Higgler

    Highest speed/frequency Op Amp

    Hopefully Op Amp users can assist me, who makes the highest frequency Op Amp out there? I plan to put RF through it, so slew rate per se isn't important, just highest frequency spec. Low power too. Hoping for frequencies in the GHz band. i need to make negative capacitors and negative...
  18. Higgler

    finding a BAE/Marconi 11-1734 antenna

    Maybe someone can help me find this antenna. I read the info off the antenna. I know BAE purchased Marconi. I wrote to them and haven't heard back. It's a 0.5-6 GHz dual ridged horn antenna. 12"x20" aperture size. The internet seems easy to find things, but not always. Thanks, kch
  19. Higgler

    Active matching circuits on low frequency antennas

    Has anyone experience with active matching of low frequency electrically small antennas (low freq = 0.1-50 MHz ballpark) (electrically small, less than 0.1 wavelengths). Called non-Foster matching circuits, op-amps are sometimes used to make negative capacitors and negative inductors to tune...
  20. Higgler

    RF via's on circuit cards, general rules, reference info

    Maybe someone could point out a good reference book on RF via's and give some general guidance on RF plated thru holes (via's). I plan on using Rogers Duroid 5880 or similar microwave dielectric. Thickness, 30, 60, 100 mils. Questions; 1) what is the length/diameter ratio typically used as a...

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