[TenTec] Strange FD RFI

[Kim Elmore]

Hi Al,

Maybe apples and organges and may not be! I'm at a loss.

We used a standard, old-fashioned rotary AC alternator, probably 8-10 
kW or so. It's not a DC-AC inverter type, so I expect that it makes a 
real sine wave, though I readily admit that didn't put a scope on it to look.

The other rigs were a mix of linear and switcher supplies. They 
didn't cause me any problems and the particular rig that caused me 
grief didn't seem to cause them any trouble. At least, I never heard 
of any. You're right though: since the '1000D uses a switcher it may 
make lots of hash under a heavy load and very little under light 
load. That possibility hadn't occurred to me. Whatever it was, it was nasty!

Kim N5OP

At 09:36 PM 6/25/2012, you wrote:
>Kim,
>
>May be "apples and oranges" here, but have you ever looked at the AC waveform
>at the base of a typical cheap CFL on a scope? It's not pretty - the
>switching PS in them puts a lot of garbage back into the AC line. I'm
>wondering if something in your FD setup caused the '1000D switching PS (AFAIK
>it uses a switcher) to send some "hash" that might normally be suppressed
>back down the AC feed to your rig's PS to upset it.
>
>'Nuther thought - were the external PSes at the other positions linear or
>switchers, or a combination? What brands?
>
>Or, it might be a plain ol' RF issue....
>
>73, Al
>
>
>On Mon June 25 2012 8:26:58 pm Kim Elmore wrote:
> > I'll pop this out here to see if anyone has any good explanations for
> > what I experienced.
> > ....
> > Has anyone ever heard of anything like this? Is there something
> > unique about the FT1000D power supply or the rig itself that causes
> > stuff like this?
> >
> > Kim N5OP
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec at contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>_______________________________________________
>TenTec mailing list
>TenTec at contesting.com
>http://lists.contesting.com/mailman/listinfo/tentec