AMRAD LF Upconverter, LO

[Frank Gentges KØBRA]

Larry,

The HC04 circuit provides a nice square wave output.  When using an 
oscillator module you should seek a clean square wave output.  The TOYOCOM 
might work but it may not.  You will have to do a side by side test with 
the correct waveform to assess the impact.

As you saw in the article, we rejected the Epson synthesizer module after 
testing.  A straight crystal oscillator is more suitable.  I suspect 
TOYOCOM is doing something strange to create such an asymmetrical waveform.

Frank


At 11:43 PM 3/26/02 -0500, you wrote:
>Frank & Steve:
>
>Re AMRAD LF Upconver, Local Oscillator
>
>I have read and reread this article in QST and am unable to find where you 
>speak to the issue of the desired waveform of the LO.
>
>My observations are that most/many packaged oscillators have a equal 
>lateral triangle waveform on the output.  Logic oscillators (as in 74HC04) 
>can have seriously distorted outputs, as much as 80% and 20% unequal 
>output waveform.   Last but not least I have some TOYOCOM oscillator 
>modules (TCO-512K) here that put out a pulse that looks like a right angle 
>triangle.
>
>What would be the effect of such distorted waveforms when used with your 
>upconverter design?
>
>My thanks in advance for your consideration of this inquiry.
>
>Larry
>VA3LK
>
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Frank Gentges KØBRA
<fgentges@mindspring.com>
LF web site at <http://www.amrad.org/projects/lf>