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Old January 22nd 07, 08:16 PM posted to rec.radio.amateur.homebrew
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Posts: 49
Default Bad Colpitts osc Waveform


"John Ferrell" wrote in message
...


I have recently subscribed to a service from the Agent Newsreader
folks at http://www.forteinc.com/agent/support.php
For $2.95 per month I get 7G of upload/download. Where your usage
stands is available all the time. They claim to cover the entire
Usenet. It works for me.


Yeah, and $3 a month here and $5 a month there for stuff that wildblue ought
to provide along with their $50 a month satellite service.




BTW, are you the RST Engineering that used to make the Aviation
Electronics in the 1970's?


And still do. www.rstengineering.com

Jim


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Old January 23rd 07, 04:16 PM posted to rec.radio.amateur.homebrew
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Default Bad Colpitts osc Waveform


BTW, are you the RST Engineering that used to make the Aviation
Electronics in the 1970's?


And still do. www.rstengineering.com

Jim

Nice products. I still have a couple of your VOR testers that I mainly
used to verify my radios worked before departing the Bahamas on an
international IFR flight plan. After the plane had set a couple of
weeks it was nice to know the Navs were working before getting
airborne.

I probably ought to EBAY them. I have not used either for over 20
years and will have no use in the future!

John Ferrell W8CCW
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Old January 24th 07, 03:54 PM posted to rec.radio.amateur.homebrew
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Default Bad Colpitts osc Waveform

I duplicated a circuit for someone because they got a bad
output waveform.
As I shift up in freq at about 2.7Mhz the voltages jump.


If the voltages suddenly jump with frequency change then this is a sign of
instability. Not seen the circus digramus confusicus, but if it is a colpits
then reduce the gain by adjusting the ratio of the two divider capacitors. I
assume, of course, that you have adequately decoupled the supply line, and
that there is no inductive coupling/feedback.

Instability causes eratic frequency and/or severe distortion. In
particularly bad conditions it can cause unwanted visitors (CBers,
neighbours, DTI, etc.).


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