[AMPS] RF Applications Wattmeters

[Bruce R. Knox]

Tom:

Since the peak detector holds that value for some number of seconds, users feel very 
uncomfortable seeing 250 watts coming out of their barefoot IC-xxx or whatever, even if that 
high power display is there for a short time.

Explaining the need to turn off an internal tuner (among many other crazy questions) to get decent 
readings keep us busy enough!

73

Bruce R. Knox

-----Original Message-----
From:	Tom Rauch [SMTP:w8ji@contesting.com]
Sent:	Thursday, June 24, 1999 17:30
To:	'amps@contesting.com'; Bruce R. Knox
Subject:	Re: [AMPS] RF Applications Wattmeters

> The rest of the operation of the unit is software based.  Software peak
> detectors are used to "grab" the highest instantaneous voltage from the
> detector.  That value is squared and divided by a constant (e*e/r=power)
> to display the RF power.   Software determines when and how to "dump" the
> peak detectors.  A digital filter of sorts is used to eliminate errors
> from the initial power spike often discussed on this board.

Why eliminate a peak that is really there?

Most people would love to know what the real overshoot is, since it 
reduces component life and increases splatter. 

My opinion would be if the overshoot is there tell us.
 
73, Tom W8JI
w8ji@contesting.com


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