[DSP-10] Software birdie???

[Bob Larkin]

Hi Lee -

  I posted a couple of pictures of the DSPx/KDSP10 combination with the 
input disconnected.
http://www.proaxis.com/~boblark/p1040529.gif  and
http://www.proaxis.com/~boblark/p1100545.gif

  One is tuned to 0 Hz and the other is tuned to 1 kHz. The latter is the 
biggest birdie I can find. It tunes at 3 times rate. That is, it is at DC 
when the tuning is at 0 Hz, and moves up to 3 kHz when tuned to 1 kHz The 
same birdie reappears at 17 kHz, with the same level and tuning rate.

  This, is of course, the "audio-input" processor CTRL-ALT-o (not 
zero).  This was with no rf hardware even attached, just the DSP.

You might try duplicating the settings and see what you get. I'm curious.

73,
Bob  W7PUA

At 09:46 AM 1/4/2006, you wrote:
>Another update.
>
>In further checking, I believe this is the 5KHz birdie which I thought was 
>eliminated.  Just in case I picked up an old file, I re downloaded the 
>"DSP Program for DSPx and KDSP10" uhf3x_30.zip file and ran that one with 
>the same results.
>
>I have not received any comments on the last two posts. Would really like 
>to hear a comment or two about this problem.
>
>Lee - AA1YN
>
>At 08:31 AM 1/3/2006 -0500, you wrote:
>>As an update,
>>
>>I powered up the KDSP10x without hardware. I grounded the two audio 
>>inputs.  The same birdie appears and as you move up in freq (CW mode), 
>>the birdie moves up also.  This to me would indicate it is coming from 
>>the KDSP10 internally.
>>
>>Lee - AA1YN
>>
>>At 03:45 PM 1/2/2006 -0500, you wrote:
>>>I am in the process of building a DSP-10 for NG4C and have the 2 PLLs up 
>>>and running with the KDSP10x.  I do not have the RF nor audio section 
>>>done.  The KDSP is only connected via P101.  I noticed in CW mode, there 
>>>is a birdie of about 3dB @1200Hz with the freq set for 144.000  It does 
>>>move up in audio freq as I increase the RF Freq.
>>>
>>>I am running with the latest 3.5 software and the latest DSPx software.
>
>
>Lee Scott - AA1YN http://www.aa1yn.com
>Home of the VHF & Up Register http://www.aa1yn.com/vhf
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>
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