[hpsdr] Penelope Input and Output Voltages and Waveforms

[Richard Stasiak]

Hi Helmut

I changed my measurement connections this am.  No ripple now on JP2. Must have been the clock pickup on the scope probe ground lead.

Will post revised bmp file later today.

Thanks for the confirmation.

73 

Rick ve3mm

On 2011-09-04, at 7:12 AM, "Helmut" <dc6ny at gmx.de> wrote:

> Hi,
> 
> using same software version and test conditions on my Penelope:
> 
> No 122Mc ripple can be detected on the input signal with my Tektronix scope. I think if the ripple would really exist, the output waveform should show the same.
> 
>  
> 
> 73 Helmut, DC6NY
> 
>  
> 
> Von: hpsdr-bounces at lists.openhpsdr.org [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Rick ve3mm
> Gesendet: Sonntag, 4. September 2011 00:31
> An: hpsdr at lists.openhpsdr.org
> Betreff: [hpsdr] Penelope Input and Output Voltages and Waveforms
> 
>  
> 
> Hello
> 
>  
> 
> Duane W5PNM asked for assistance on Teamspeak last night in diagnosing a suspected problem with his Penelope. He was looking for information on the input and output voltages at Penelope's output device (OPA2874 Op Amp).  
> 
>  
> 
> Here are some measurements on my Penelope. 
> 
>  
> 
> Setup:
> 
>  
> 
> Software: K5SO PWSDR 1.19.3.5 diversity20
> 
> Frequency 7.010 Mhz.
> 
> Power Output measured at 500 mW into 50 ohm load
> 
>  
> 
> Voltage measurement at JP2 (Input to T1) 295mV RMS
> 
> Voltage measurement at 50 ohm load 5.10V RMS
> 
>  
> 
> Measurements were taken with an Agilent Oscilloscope MSO-X 2024A.
> 
>  
> 
> I have uploaded a screenshot of the scope at Hamsdr.com in my personal files section.
> 
>  
> 
> http://www.hamsdr.com/PersonalDirectory.aspx?did=44
> 
>  
> 
> As is usual in most experiments, one thing leads to something unexpected......
> 
>  
> 
> The input waveform shows a definite 122 Mhz ripple.  I am not sure if it really there ....is it an artifact a poor scope connection or is it leakage from the clock connection between my two mercury cards (used for synchronization for diversity reception). More investigation is needed.
> 
>  
> 
> 73
> 
>  
> 
> Rick ve3mm
> 
>  
> 
>  
> 
>  
> 
>  
> 
>  
> 
>  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openhpsdr.org/pipermail/hpsdr-openhpsdr.org/attachments/20110904/5479a2e6/attachment-0004.htm>