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   Home   Help Search  
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Author Topic: tuner arching  (Read 1971 times)
N6AJR
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Posts: 9930




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« Reply #15 on: January 01, 2007, 12:29:36 PM »

deoxit... great stuff
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N2JXN
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Posts: 189




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« Reply #16 on: January 01, 2007, 12:42:07 PM »

where can I buy some
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W7ETA
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Posts: 2527




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« Reply #17 on: January 01, 2007, 01:35:37 PM »

If the contacts are exposed, try a Q-tip and rubbing alcohol.

I've heard a few hams mention WD-40 working pretty good (when you can't find contact cleaner).

Bob
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W9PMZ
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Posts: 627


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« Reply #18 on: January 01, 2007, 02:38:47 PM »

Radio Shack sells Caig DeOxit.

73,

Carl - W9PMZ
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K4JJL
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« Reply #19 on: January 02, 2007, 07:52:32 AM »

I have a MFJ-989C that arced w/ my Heathkit SB-1000 running around 700 watts.  Once it arced the first time, it constantly arced when tuned for the same frequency and power output.  I replaced it with a Nye Viking MB-V-A tuner and put the MFJ on the loaner shelf for people who just get into HF to use (next to the SB-1000, which was replaced w/ an Alpha 76PA).
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WA2JJH
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« Reply #20 on: January 11, 2007, 02:16:45 PM »

mFJ's use the minimum rated parts for their tuners.
I have fried 300w MFJ's with 100w and high swr.

  If you see a power rating on a MFJ tuner, assume that is the handling power at 1:1.5 mismatch.

  I have a Drake MN-75 300W tuner. It never arcs with a huge SWR with 150w. In fact I was able to run 500w
through my drake tuner with a 1:1.5 match.

  MFJ uses variable caps with a minimum of plate spacing.

  If you have thier 1.5k tuner, derate it to 500w when SWR is unknown or high. Tune the MFJ with reduced drive. Say 300-400W. Once you get under a 2:1, increase
power to 700w. Then tune for a lower SWR.

  The only MFJ tuner I liked was a new atu. It does handle the power it says it can.(300w) However remember an ATU tunes faster than a human.



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