Re: [TowerTalk] Tuner SWR won't stay down

[David Gilbert <xdavid@cis-broadband.com>]

Put a different SWR meter (not a tuner) in front of the MFJ-989C so you 
can see if it's simply the meter circuitry in the 989C that's acting weird.
Dave  AB7E



> > On Jan 1, 2015, at 3:09 PM, Tom Osborne <w7why@frontier.com> wrote:
> >
> > Hi
> >
> > I picked up an MFJ-989C tuner that has a problem (don't want to hear about 
> > 'mitey fine junk).
> >
> > The problem is that the SWR goes down and then slowly creeps back up.
> >
> > I got a new roller inductor and installed it and the SWR still doesn't stay 
> > low, even at low power.
> >
> > I took the roller inductor out and put in a switch/coil combo to eliminate the 
> > coil problem.  SWR still climbs up.
> >
> > Bypassed the SWR circuitry and ran the input from the antenna directly to the 
> > capacitor.  Still won't stay low.
> >
> > I thought it might be the SWR circuitry but I put another tuner in front of 
> > this one and when I tune the SWR down with the other tuner, it stays down, so 
> > don't think it should be the SWR circuit.
> >
> > This really has me puzzled.  Can't see anything left to check.  Any ideas?  
> > Thanks and 73
> > Tom W7WHY
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