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Improve Performance

Discussion in 'Electronic Design' started by OldGuy, Nov 18, 2012.

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  1. OldGuy

    OldGuy Guest

    The circuit, that is a little weak.

    I have a VEC-8218 built from a kit and it is functional.
    Schematic here:
    Page 15.

    Uses a MRF901 front end with 1N270 detector.
    This is 1999 technology.

    I would like to improve the ability to detect higher frequencies.
    The higher the better but good response at 2+ GHz would be a minimum.

    Suggestions to circuit changes please.
  2. linnix

    linnix Guest

    Welcome to the 21th century.

    Smart buggers would use 2.5GHz FH/DSS running below 0db. All you see is noise, if you don't follow the proper FH/DSS protocol. I am using MRF24J40 to communicate and scan for signals. Interesting enough, communications work at any level of signal and noise, even with the occasional pop-corn burst(huge signal from microwave).
  3. miso

    miso Guest

    Unfortunately they are out of business. Perhaps it shows up on ebay.
    They used an Analog Devices RF detector as the front end IIRC. I talked
    to the guy who designed it. He first started out just selling them at
    the ham flea markets.

    Besides the meter (log or linear), it had a LED that goes off to detects
    bursts of RF.
  4. josephkk

    josephkk Guest

    Maybe, maybe not. That depends a lot on the various system properties
    desired. You might want a front end that does not easily overload so that
    weaker signals can be found underneath, think about DSSS. There are other
    cases that i am sure you can find.

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