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From: piglet <erichpwagner@hotmail.com>
Newsgroups: sci.electronics.design
Subject: Re: Distorted Sine Wave
Date: Sat, 1 Jun 2024 22:00:58 -0000 (UTC)
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Cursitor Doom <cd999666@notformail.com> wrote:
> On Sat, 1 Jun 2024 15:44:17 +0200, Jeroen Belleman wrote:
> 
>> On 6/1/24 14:07, Cursitor Doom wrote:
> 
>>> I've taken a shot of the waveform into the 50 ohm input. It's around
>>> 850mV peak-peak. Hopefully the slight distortion I spoke about is
>>> visible; the slightly more leisurely negative-going excursions WRT
>>> their positive-going counterparts. So it's not a pure sine wave as one
>>> would expect. Does it matter? I don't know!
>>> 
>>> https://disk.yandex.com/i/7cuuBimDbOIBZw
>> 
>> The shape looks perfectly acceptable to me. This is +3dBm into 50 Ohms.
>> Is that what it's supposed to be? Canned reference oscillators most
>> often deliver +13dBm, sometimes +10dBm.
> 
> Is it? I only make it about half your figure: +1.65dBm.
> I admit I'm frequently prone to careless errors, so stand to be corrected, 
> but here's my method:
> 850mV peak to peak is 425mV peak voltage. Average of that is 0.425x0.636 = 
> 0.27V. Average power is average volts squared divided by the load 
> impedance of 50 ohms = 1.46mW = +1.65dBm.
> 
> I shall consult the manual to see what it ought to be - if I can find it, 
> that is, as PDF manuals are a nightmare to navigate IME.
> 
> 

Use 0.71 for RMS instead of 0.636 ! I make that about 1.8mW or +2.6dBm ?



-- 
piglet