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? on SWR/wattmeter

Discussion in 'Electronic Basics' started by Dave, Dec 28, 2003.

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  1. Dave

    Dave Guest

    I just bought a Herald Electronics SWR/power meter, and have a question on
    operation. The only SWR/power meter I am familiar with is the old Radio
    Shack CB tester I bought about thirty years ago. It has a multi-position
    rotary switch that you set to Cal for calibration (where you adjust a
    different knob until the needle swings to the appropriate point.) This one
    has no such position on the Function switch. Instead it has a two-position
    switch that says FWD/MOD SET/10W on top, and REF/MOD/100W on the bottom. I
    am guessing that this is somehow used for calibration, but have no clue as
    to how. How do you calibrate this puppy? Are most SWR/power meters built
    this way?

    Thanks for any help.

    Dave
     
  2. Ross Mac

    Ross Mac Guest

    This sounds like a good question for the ham radio operators newsgroups,
    though, there may be someone here that could help you too.
     
  3. Larry Green

    Larry Green Guest

    I still have an old Rad Scrap SWR meter in a drawer around here somewhere! I
    am not familiar with the Herald SWR meter and I now have a Daiwa
    cross-needle meter, however, you should (hopefully) have a manual for that
    meter but if not you might find the following helpful.

    You will need to switch between one position and the other on that meter to
    check both forward and reflected SWR. The following website may help you to
    figure out how to use it.

    http://www.4x4cb.com/public/showpage_preview.cfm?CatID=645

    Larry VE3YET
     
  4. Dave

    Dave Guest

    Thanks for the link, Larry! I'll check it out.

    Dave
     
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