[TenTec] RFI Issue

[David L. Thompson]

> 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.

You either need a ground or one of the artificial grounds such as the MFJ
931.  You also need to
put some snap on beads on the mic cord or wrap the cord in foil tape. Try
these and see what happens.
73 Dave K4JRB

>
> 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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