[TenTec] Strange FD RFI

[Bob McGraw - K4TAX]

Also consider that the line impedance from the commercial source is likely 
much lower than the generator.  Generators don't like rapid load changes 
such as trying to follow the waveform of a SSB signal or CW signal. 
Likewise they attempt to correct accordingly.  There was a review of 
generators in a QST within the past 3 or 4 months as I recall.  Also many 
generators have a rather high level of distortion of the sine wave.  None of 
this would be shown on a DVM.

In an effort to minimize weight in the radio and minimize size, the Vc 
filters are quite small.  After all they're likely OK for a clean power 
source but not so for a nasty one such as might be produced by a generator. 
Oh, another though on generators, were you using the inverter type or the 
old fashion rotor type?  The inverter types are not known for being clean, 
only efficient.

As to the UPS, that's what they do, produce clean stable power.  Therefore, 
I don't view that there is any problem or issue with your radio.  Only the 
power from which it operates must be clean.

73
Bob, K4TAX


----- Original Message ----- 
From: "Al Gulseth" <wb5jnc at centurytel.net>
To: <tentec at contesting.com>
Cc: "Kim Elmore" <cw_de_n5op at sbcglobal.net>
Sent: Monday, June 25, 2012 9:36 PM
Subject: Re: [TenTec] Strange FD RFI


> 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
>>
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