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NNTP-Posting-Date: Wed, 29 May 2024 20:42:13 +0000
From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Distorted Sine Wave
Date: Wed, 29 May 2024 13:42:13 -0700
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On Wed, 29 May 2024 21:43:54 +0200, Arie de Muijnck
<noreply@ademu.com> wrote:

>On 2024-05-29 19:07, Cursitor Doom wrote:
>> Gentlemen,
>> 
>> Whilst fault-finding on my HP 8566B spectrum analyzer, I've found the
>> 10Mhz reference oscillator is generating an 'unsatisfactory waveform'
>> which may be causing the device to be unable to lock it's main PLL.
>> I've come across this waveshape before, but mostly with oscillators I was
>> building and in the process of trying to iron out the wrinkles of and
>> certainly NOT a critical reference oscillator from a respected
>> manufacturer. Can anyone tell what's most likely going on here?
>> 
>> https://disk.yandex.com/i/z6fYbeVfPRK7aA
>
>
>Looks like reflections in the cable. Try the 50 Ohm termination.
>
>Arie

If the drive is a sine wave, a cable can't generate that 2nd harmonic.

Our boxes output a 10 MHz square wave. Our clock inputs have a 10 MHz
bandpass filter, so they accept most anything.