[TenTec] RFI Issue

Thu, 20 Mar 2003 21:05:53 -0500

Seem to me that right off the bat you should have both the tuner and the
Scout connected to a good earth ground.  de Larry/W3RL
----- Original Message -----
From: "Shawn Upton" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Thursday, March 20, 2003 9:49 AM
Subject: [TenTec] RFI Issue


> 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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