----- Original Message -----
From: Lamb <k7fm@teleport.com>
To: <k5ra@mail.pulse.net>
Sent: Wednesday, December 22, 1999 9:11 PM
Subject: Re: Two Tone Tests
> I agree that 2 tone tests are not conclusive. But, I only stated that:
>
> "Once you argue that the cause for distortion is excessive grid current,
> then you must accept succesful plots of 2 tone tests as proof that
> either the G2DAF circuitry does not have excessive grid current or that
> it does not matter."
>
> If the G2DAF can pass a 2 tone imd test, it does not prove that it does
not
> have intermod. or that it does not splatter. However, it has been argued
> that the G2DAF circuit has so much grid current that it cannot be linear,
> and the worst case would be at full drive during a 2 tone test. Passing
the
> 2 tone test would simply prove that the G2DAF circuit does not develop
> "too" much grid current to be linear. It can be non-linear for other
> reasons - but not excessive grid current.
>
> In this case, the 2 tone test would simply disprove something. And,
> sometimes knowledge is obtained by eliminating falsehoods and
concentrating
> on the facts.
>
> 73, Colin K7FM
>
>
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