Thursday, September 10, 2009

MFJ antenna tuners vs Icom TX

I never heard of the ham radio Swan 700-CX. The rig is from 1973, with tubes which gives 450 watts PEP output. But I like it very much although it's not a QRP rig. Today I got a message from Hamshop about the MFJ antenna tuners vs Icon transceivers. It seems to be that the Icom transceivers could be severe damaged. Especially the IC-7000. Some Icoms are burned up.

7 comments:

  1. Swan was an American company. The Swan 700cx was first manufactured in 1973. About 700 watts input!!!

    Does that IC-7000 have a built-in automatic tuner of it's own? If so, the two tuners may be working against each other. I never heard of that problem.
    73 Dick

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  2. Hi Dick, The IC 7000 has no automatic tuner on board. I also never hear of it, but Hamshop is a trusted webshop for the Dutch radio amateur.

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  3. Congratulations on winning the Football against Scotland Paul! The map of Holland I bought was only of Nord Holland & Zuid Holland and not the other provinces, so it was not a map of the entire Netherlands. I thought Holland was the same as The Netherlands so shows how ignorant I am! Have to send it back now!

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  4. Hi Adam, strange only Noord-Holland and Zuid Holland. Only 2 provinces. I only use this:
    http://f6fvy.free.fr/qthLocator/fullScreen.php
    You can find the any QRA locator, and zoom in on any place on earth. I love it. 73, Paul

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  5. The only thing I can think of, is the meter on the MFJ tuner is so terribly inacurate that serious damage was done. Meter reading 1.2 to 1 but really 10 to 1. I've had and have MFJ metered tuners but never experienced anything like that.

    Can't believe that applies to all their tuners. Perhaps the automatic ones?

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  6. Hi Dick, I read a lot about bad connections, inaccurate meters and sloppy solder work in MFJ equipment. I am a bit reluctant to buy MFJ stuff.

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  7. I agree with your MFJ comments, Paul. I would never buy anything from them costing hundreds of dollars/euros. But I must say I have three different MFJ low-cost tuners, and at QRP levels, they function very well. But I don't stress them out with very un-resonant antennas that are coax fed.
    73 Dick

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