🚀 go-pugleaf

John Larkin wrote:
> On Thu, 25 Jun 2009 14:37:54 -0700, Joerg <invalid@invalid.invalid>
> wrote:
> 
>> John Larkin wrote:
>>> On Thu, 25 Jun 2009 12:56:30 -0700, Joerg <invalid@invalid.invalid>
>>> wrote:
>>>
>> [...]
>>
>>>> Probably the litmus test for RF stuff like this is when people schlepp 
>>>> it to Otis Street and see if it can survive Sutro Tower.
>>> It's terrible here. Scope traces are gross fuzz, and all sorts of
>>> opamp front-ends like to rectify stuff.
>>>
>>> You should see the spectrum of a 10" clip lead.
>>>
>>> http://www.jimprice.com/sutro/tower1.jpg
>>>
>> Once I took off on a Europe flight out of SFO and the antenna top stuck 
>> out of the clouds while the rest of the tower was in the white. Picture 
>> perfect, and I had my camera in the overhead <aargh>. I could still bite 
>> myself, that opportunity never came again.
> 
> A couple of times I've been up on Twin Peaks and there was a sharply
> defined fog layer below. Only a couple of big buildings poke through,
> and a few plumes from power plants and such.
> 
> Sometimes the sun gets under the fog at sunrise/sunset. Cool.
> 
> ftp://jjlarkin.lmi.net/Kit1.JPG
> 

Nice. Would be even nicer without the attached city :-)

> 
>>
>>> We did do a useful simulation of a system that has a superconductive
>>> magnet/front end on one side of a room and some ADCs on the other
>>> side. We convinced ourselves that we need to go differential.
>>>
>> Yesterday I had my comeuppance WRT to the Instek GDS-2204 scope that I 
>> thought is so much better than Tektronix. In many ways it is, and also 
>> doesn't have the nasty conducted emissions on the probe cables. But when 
>> debugging 74MHz gear I could not figure out where a weird buzz was 
>> coming from. Until I turned off the scope ...
> 
> CPU clock maybe?
> 

Possibly. It even happens in standby power so maybe it's the SMPS in there.

-- 
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.