Why not use a storage spectrum analyzer to look at occupied bandwidth and
IM over a significant time period while modulating with speech or pulsed
white noise? Wouldn't that be a better worst-case test?
Gary
--------------------------------------
- W3AM - Gary Blau -
- w3am@juno.com -
- http://www.w3am.com -
--------------------------------------
On Mon, 2 Nov 1998 09:28:26 -0800 Rich Measures <measures@vc.net> writes:
>
>>
>>Rich says:
>>
>>>However, in a typical 2-tone test, the frequencies are c. 1000Hz
>apart,
>>>which essentially eliminates the time constant of the screen supply
>>>filter as a factor.
>>
>>In all probability.
>>
>>But put in something modulated at syllabic rate and that's another
>matter.
>>Tom Rauch, W8JI, is a strong advocate of 3 tone testing to pick this
>sort of
>>thing up.
>>
>Three-tone is good for testing distortion in conventional amplifiers,
>however, if the screen voltage remains constant during the three-tone
>test in a G2DAF amp. (which seems likely) it would not pick this sort
>of
>thing up. The best test is probably ordinary speech since it produces
>
>wide changes in the screen potential in the G2DAF circuit. .
>
>- later, Peter
>
>
>Rich...
>
>R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
>
>
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