[TenTec] Re: Shawn's Station

[Shawn Upton]

Yeah, I know it is close--but right now, the only
alternative is to run with Hamsticks, which I suspect
would leave something to be desired for in regards to
efficency, at least on 40m (I have a 40m dipole, of
sorts).  So, moving the antenna isn't much of an
option--at least at the moment.

I tried out the system using my FT-817 (shame on me;
it was a present from the wife, really) at 5W, and
have had no issues with RFI.  The '817 was run on a
battery; but later tests with a PS did not exhibit
issues.

I bought some split ferrites, and while I did not use
several of them, I did loop the mic cord and the power
supply leads around twice for testing (seperate cores
for each cord).  No change.  I then tried it out into
a dummy load.  The radio no longer "howled", but--I
still had audio feedback into the Scout.  Now, I only
tested with a switching power supply, so my next test
will be with a different PS, and then use some
capacitance (disk and electrolytic) to see if it noise
induced by the current (under voice peaks).  I am
starting to suspect this--the supply is rated at 11A,
15A peak IIRC.  Something to look at tonight...

Thanks
KB1CKT
*************
--- Allan Henry Kaplan <w1ael@mindspring.com> wrote:
> Shawn,  I, also, suspect that your problem is that
> your equipment is in
> the near field of the antenna.  Best solution is to
> raise the antenna
> and move it away -- easier said than done for some
> of us!  As for the
> dummy load with an RF-tight and short cable -- get
> one!!  That should be
> mandatory provision of a station license.   The
> snap-on cores are worth
> a try,but you might have to invest in 5 or six of
> them....    The
> artificial ground is worth a try, too.  That amounts
> to a quarter-wave
> counterpoise wire leading away from your TX chassis,
> and unconnected at
> the far end.  The artificial ground approach is
> particularly convenent
> because it allows you to tune the counterpoise
> length to match your
> operating frequency and the effect of objects in the
> close encvironment.
> At this point, I suggest that Ten-Tec's Artificial
> Ground is a
> two-evening kit, and less expensive than other
> offerings.  
> good Luck & 73, OM.
> Allan, W1AEL -- one of the hams at Ten-Tec.
> _______________________________________________
> Tentec mailing list
> Tentec@mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/tentec


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