[DSP-10] CW transmit has a raspy sound

[Bob Larkin]

One more test---I just made the 126 MHz osc free run by a short across 
C113. It looked reasonably clean at 5 kHz/div and 1kHz BW. Much, much 
cleaner than what I see in your SA shot.. Later, I will post it for reference.

Good luck,
  Bob

At 05:36 PM 3/28/2006 -0800, you wrote:
>Hi Lee,
>
>I agree, something is quite wrong!!
>
>I dropped a loop near the 127 MHz Osc ( I moved up to get roughly the 
>tuning voltage you have) and snapped a picture of the spectrum analyzer:
>http://www.proaxis.com/~boblark/127mz1.jpg
>
>This was done with the BW I had available, 100 Hz, as I don't have 300 
>Hz.  But  BW=1 kHz looks clean also. There was nothing to see outside of 2 
>kHz/div so I
>
>Maybe loop filter components? Possibly, but not likely the PLL IC.  Maybe 
>someone else has ideas.
>
>Also, the spectrum to the right  in the unlocked pix seems strange. How 
>did you achieve "unlock?" Maybe this is the residual on the phase detector 
>output.
>
>I will pursue this further, after dinner.
>
>73,.  Bob W7PUA
>
>At 04:43 PM 3/28/2006 -0500, you wrote:
>>I have been playing around some with an HP 141T spectrum analyzer I just 
>>purchased and have been looking at the local oscillators.  While the 
>>19MHz osc looks fairly clean, the 124MHz osc does not. As a mater of 
>>fact, it is pretty bad in my opinion.  I don't know if anyone else has 
>>had the opportunity to look at theirs but I've put up a web page on my 
>>web site showing what I've found.
>>
>>When taking the measurements, I've removed the coax jumpers from the 
>>outputs of the oscillators and used a pigtail coax with an SMA connector 
>>to get the signals to the analyzer.
>>
>>The URL is http://www.aa1yn.com/dsp-10/spec_ana/ and the images are 
>>linked to medium resolution images.
>>
>>Any thoughts? Any questions? Any ideas?
>>
>>
>>Lee Scott - AA1YN http://www.aa1yn.com
>>Home of the VHF & Up Register http://www.aa1yn.com/vhf
>>Home of the VHF Talk chatroom http://vhftalk.aa1yn.com
>>Hooksett, NH
>>FN43gc52
>>
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>
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