Mike, I think Steves advice is good about the cleaning.  It's normally good 
practice to tune at a low power, ten or fifteen watts to prevent arching 
then up the power after the sweet spot is found and also it is much easier 
on your xcvr tuning at low power.  Good luck and 73
Ed   K7UC

--------------------------------------------------
From: "Michael Ryan" <[log in to unmask]>
Sent: Sunday, November 10, 2013 6:54 PM
To: <[log in to unmask]>
Subject: Re_ATU Issues

> Hi Steve:=20
>
> Well 1ST up, my tuner is very old. I bought it last winter from a Guy =
> who was the 3RD owner of it. So, its probably in access of 15 to 20 =
> years old.=20
> It probably needs a good cleaning no doubt. There was no fluctuations in =
> the SWR or full power out when the antenna was directly connected to the =
> 570. I got my XYL to look at the display for that one.=20
> The flux only occured around 3.79MHZ with the MFJ-989  and I had to =
> rotate the roller inductor knob about 10DG clock or counter clock wise =
> to keep the SWR flat.=20
> So, this is how it goes. I tune for the low SWR, unkey, key up to check =
> and the SWR would be up to about 10/1. I'd key again and rotate the =
> roller inductor again to lower the pitch and SWR, take a reading and it =
> would be flat. I would receive for about a couple of 2nds and want to =
> take a reading so would key up and boom, the SWR would pop back up =
> again.=20
> All other bands perfect. Almost something might be arcing in there but =
> don't see any sparks or hear any crackling or smell any smoke. LOL=20
> The thing is, if it was the roller inductor, wouldn't that occur on all =
> bands or it depends on if you happen to hit that spot that might be very =
> dirty? The tuner is rated at 2KW SSB/1500W CW, my rig is rated at 175W =
> CW, so don't think 75/80W is too bad.=20
>
> 73:=20
> Michael DE VO1AX=20