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Thread: Sigma RF2000 ?

  1. #1

    Default Sigma RF2000 ?

    Hello to all!
    W7ORW here, for the first real post.

    A friend and Elmer here loaned me a SWR meter today.
    It is a Sigma RF2000.
    Despite my usual efforts to find a manual online, or a YouTube video about it, I'm coming up empty.

    There is an adjustment knob on the front of it. I don't know what that is for.

    The SWR readings I'm getting on 40, 80, and 20 meters is so low that I am not confident it's correct.

    Can anyone point me to a source for a manual for this unit?

    Thank in advance for any and all help!

    73!

    Zechariah Hampton W7ORW

    W7ORW

  2. #2
    Super Moderator 5B4AJB's Avatar
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    I can only find one small, blurry image of the unit, can you provide a bigger one?
    An inside image would be helpful too...

  3. #3

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    Here ya go!

    W7ORW

  4. #4

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    The only thing that stands out to me by looking at the picture is the power meter has two scales but no scale switch and that one is 10x larger than the other. Since the dial has 10 numbers on it, I wonder if it is some multiplier for the smaller scale. Being you have a nice kenwood sitting under it, I would start by:
    1-turning the car knob down to just before it clicks
    2-set the mode switch to CW
    3-flip it to send
    4-slowly turn car up until you get a small amount of movement on the power needle
    5-turn that mystery knob and see if it affects the swr scale or the power scale

    I would assume that, if it was meant for calibrating the swr scale, there would be a switch to make while calibrating. Being I see no calibration switch, I am led to believe it is for adjusting the power scale. But why not just a switch to go between the two scales??? A 675w amplifier power test? Not like adjusting the scales with that knob could be any more accurate than reading it on full scale. None of it makes sense to me. If the above test don't lead to anything, crack it open and take a picture of the guts like 5B4AJB suggested, it would help a lot.

    EDIT: start with the knob at 0 because the kenwood isnt even close to 2kw. where its set, you might not even see the power needle move turning up the carrier level...
    Last edited by brandon lind; Sun 26th May 2019 at 06:48.

  5. #5
    Super Moderator 5B4AJB's Avatar
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    I'd take the markings on the front with a pinch of salt.

  6. #6

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    Thank you both for your perceptions and opinions!

    I am trying your suggestions.

    Will report results, once I'm sure I can give an accurate report!

    Thanks!
    73

    W7ORW

  7. #7
    K7KBN's Avatar
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    Quote Originally Posted by 5B4AJB View Post
    I'd take the markings on the front with a pinch of salt.
    A "dose of salts" might be more effective.
    73
    Pat K7KBN
    Semper ubi sub ubi.

  8. #8

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    Found this. May be helpful...or not
    http://www.fixya.com/support/t9537138-need_user_manual

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