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Message-ID: <5.1.0.14.0.20020123105222.00a5b6a0@POP2.sympatico.ca>
Date: Wed, 23 Jan 2002 11:06:58 -0500
To: rsgb_lf_group@blacksheep.org
From: "Larry Kayser" <kayser@sympatico.ca>
Subject: LF: Reference Osc. Waveform
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Greetings All:

This discussion of DDS chips reminds me of a problem I have here.  I have 
two, very nice TOYOCOM TCO-512K oscillator modules.  I want to put these to 
work here.  The output waveform looks like this on the Scope I have here

x             x                x
  x            x  x            x
   x           x   x           x      etc.  The waveform looks almost 
exactly like a right angle triangle.
    x          x    x          x
     xxxxxxx     xxxxxxx
       ^       ^        ^
The up arrows are the beginning of a cycle, the middle of the cycle, the 
end of the cycle.

What will this type of waveform do to the 9850?  Does the 9850 want a 50% 
duty cycle? or can I put this kind of wave form into the 9850 without risk?

These are very high quality units, they were the frequency determining 
elements in an early analogue cellular radio system (Swedish system), but I 
am at a loss to understand this waveform on the output.  I have tried 
different loadings on the output (10K to 50 ohms) and it seems to stay very 
close to the same,

If this waveform is not suitable is there a simple way to add something to 
make the waveform a square wave with 50% duty cycle?

Larry
VA3LK