>
>Subject: Re: [AMPS] Bias for SB-220
>Date sent: Fri, 4 Jun 1999 03:23:17 -0700
>From: Rich Measures <measures@vc.net>
>To: "Dick Green" <dick.green@valley.net>,
><amps@contesting.com>
>
>>
>>
>>
>> >? How many peak volts on your 'scope? With "normal" ALC indication, my
>> >TS-440S overshoots to about 120v-p. into 50-ohms. .
>> >
>> >I didn't measure it on my scope because I thought I needed a fast
>> >peak-reading or storage scope.
>>
>> ? A triggered scope with a vert.-deflection delay line will see the
>> leading edge.
>>
>
>Nonsense.
? .Anything you say can be used against you. You have a right to remain
silent. . (Miranda vs. Arizona (1966).
>
>The time interval of the pulse is well under 1 mS.
? There is no defined time interval. The overshoot pulse occurs after
the charged ALC bus decays, at the next spoken word. The >90% peak of
the pulse typ. lasts roughly 1mS.
>The scope would
>have to be triggered from the source well ahead of the envelope
>rise, in order for the trace to move off the starting point and catch
>the leading edge.
? In an oscilloscope that uses a vertical-signal delay line, the sweep
triggers before the pulse arrives at the vertical deflection plates.
This allows one to view the region Before the pulse started. With my
oscilloscope, I can observe single pulses with risetimes of <20nS.
>
>If the decay time of the phosphorus is fast, the pulse will be gone
? which is why I did not go for a short-persistence phosphor CRT. .
>before your eye ever recognizes the pulse. That's why fluorescent
>lamps, with 120 pulses of light per second, look like a steady
>picture. If it was only one pulse of under 1 mS, you'd never know
>the bulb lit.
>
>You'll never see most overshoot on a non-storage display. Anyone
>that understands use of test equipment would know that.
>
? how about that?.
- later, Tom.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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