[TenTec] RFI Issue

[Shawn Upton]

I set up my radio over this last weekend, but I seem
to have an RFI issue.  I have a 40m dipole squeezed
into a 30' run (zig-zag setup), with about 10' of 300
ohm twinlead to an MFJ-969 tuner, to my Scout.  The
Scout is powered by some off-brand switching power
supply, which seemed quiet enough.  No grounding is
used.

The issue: My SSB audio comes through the Scout
speaker with some distortion.  And on 20m, if I just
push the PTT, the radio will "howl".  I'm not too
surprised that 20m has issues--but the issue appeared
on 80m, 40m, 20m, and 15m.  

The Scout is left running at 50W, and when I tune the
tuner, I am acheiving 1.5:1 SWR or so.  I tried
swapping coax (from tuner to radio) with no change.  I
don't have snap on ferrites, but I tried wrapping 20
turns of the power cord around a metal screwdriver,
and had no change.  This RFI does not seem to be band
dependant.

I tried out my FT-817 on the setup, and had no issues
(with the radio setup).  But that is only transmitting
at 5W, not 50W.

I'll try tonight changing power supplies to a linear
that I have, and to see if the feedback exists when
transmitting into a dummy load.  Any suggestions? 
Thanks.

KB1CKT
Shawn Upton

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