[AMPS] G2DAF

[w3am@juno.com]

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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