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From: "Ron Hubbard"
Subject: Re: Displaying ELF On a 'Scope
Date: Fri, 20 Dec 2002 15:00:33 -0800
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Hmm, use a 500 Hz oscillator and mix it with a 30 Hz to get a sum signal of
530 Hz and a difference of 470 Hz? If there was harmonic distortion in the
original 30 Hz signal, would the resulting signal still have that distortin
if the LO's signal was relatively pure?
Many years ago there used to be an article in some electronics magazine that
showed a low frequency up converter using PLL circuits. I didn't need it
then, but I sure wish I had it now... Bummer.
steve wrote in message <3E038042.email@example.com>...
>If the problem is that the frequency of the signal is too low to enable
>you to see an entire cycle at the scope's slowest sweep setting, how
>about mixing the signal up to a higher frequency using an inexpensive
>mixer and a fixed local oscillator signal?
>Just a thought.
>Ron Hubbard wrote:
>> I have an old 10 MHz Heathkit oscilloscope that works okay at the very
>> end, but on the very low end— say 1 Hz to 300 Hz — when I try to display
>> sine wave all I get is a section of it; I can't even tell if it's a pure
>> sine or there's distortion. Anyone have any suggestions for getting a
>> and complete display of very low frequencies?
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