I am using a kenwood TS480 HX.  I didn't mention that, whoops!At 
01:21 PM 8/12/2013, you wrote:
>Using ladder line like that often introduces RF into the path.  It might
>help having an external tuner, but here's some other things you can try.
>First, you don't say what rig you are using.
>
>If you are using one of the Kenwoods i.e. TS2000, possibly the TS-570 etc.
>and you haven't modified the mike connector, put a piece of wire from the
>bottom screw of the mike case to the side of the rig where the mobile
>brackets attach.
>
>Second, attach a quarter wavelength counterpoise to your ground and run it
>around the perimeter of your shack.
>
>Third, if you still have RFI look at
>hamuniverse.com/ground.html
>
>Steve, K8SP
>
>
>----- Original Message -----
>From: "Mike Barnard" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Monday, August 12, 2013 9:41 AM
>Subject: RF in my signal:
>
>
> > I have had this problem quite a lot, I went from a long wire
> > antenna, to a 80 meter windam, fed with later line, and a 4 to 1
> > balum.  This helped some, and I also now have the heil microphone
> > that helped some.  I am using a LDG auto tuner, the kw
> > 1000.  Sometimes I can hear it a little when it is bad in the auto
> > tuner.  I have thought of getting a manual tuner, but until I get an
> > audio box to put in line for SWR I don't want to chance it.
> > Last night someone recommen
> > Mike Barnard
> >
> > KD2CDUded a RF isolation box.  I am going to try that.  Any other
> > suggestions are welcome.