Draw a Colpitts Oscillator

Dave WD9BDZ

John Smith wrote:
Ben:

Give us a couple of examples of what you think are difficult, relevant and appropriate questions, let us see how difficult you think this "rocket science" is, exactly?

Indeed, if there is something you are having a problem with, there are those here which can help you...

John

"Ben Jackson" wrote in message ...

On 2005-07-25, wrote:

John, Why did you go to all that trouble? The test is so easy now a
"Cave Man" could pass them.

Actually I think they were dumbed down so a cave man could GRADE them.
That dictated multiple choice, and it's hard to make a tough multiple
choice test.

Of course what do I know? I'm just a cave man who passed the tests!

--
Ben Jackson

http://www.ben.com/

Copy 60 seconds of Morse Code by hand with no errors, corrections or
omissions.

What's the difference between a Colpitts oscillator and a Hartley
Oscillator? Draw schematics of both showing the differences.

What is the purpose of a 'swinging choke'?

Ah!! Those were the days ....n :-)

David G. Nagel wrote:

Draw a Colpitts Oscillator

Dave WD9BDZ

John Smith wrote:

Ben:

Give us a couple of examples of what you think are difficult, relevant
and appropriate questions, let us see how difficult you think this
"rocket science" is, exactly?

Indeed, if there is something you are having a problem with, there are
those here which can help you...

John

"Ben Jackson" wrote in message
...

On 2005-07-25, wrote:

John, Why did you go to all that trouble? The test is so easy now a
"Cave Man" could pass them.


Actually I think they were dumbed down so a cave man could GRADE them.
That dictated multiple choice, and it's hard to make a tough multiple
choice test.

Of course what do I know? I'm just a cave man who passed the tests!

--
Ben Jackson

http://www.ben.com/

Ham op wrote:
What is the purpose of a 'swinging choke'?

To get it closer to the antenna feedpoint?
--
73, Cecil http://www.qsl.net/w5dxp

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John;

I'm starting to see a trend in your replies.


Dave WD9BDZ


John Smith wrote:

Cecil:

stoopid-puzzled-look-on-face

Some fools try to use the damn things in power supplies!

Macho men which want a real "tarzan" (the original swinger) in their radio! (arnold probably has one in his cordless phones power supply)

John

"Cecil Moore" wrote in message ...

Ham op wrote:

What is the purpose of a 'swinging choke'?

To get it closer to the antenna feedpoint?
--
73, Cecil http://www.qsl.net/w5dxp

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Cecil Moore wrote:

Ham op wrote:

What is the purpose of a 'swinging choke'?


To get it closer to the antenna feedpoint?

C'mon Cecil, you've been licensed long enough, at least as long as I
have, to know that a 'swinging choke' changes the center of percussion
on a baseball bat. It allows for a quicker swing. :-)

Now, if your antenna has a large capacitive component as part of it's
input ... then quite possibly a swinging choke might help.

But, if your HV power supply needs to limit inrush currents then ...

Ham op wrote:

Cecil Moore wrote:

Ham op wrote:

What is the purpose of a 'swinging choke'?



To get it closer to the antenna feedpoint?


C'mon Cecil, you've been licensed long enough, at least as long as I
have, to know that a 'swinging choke' changes the center of percussion
on a baseball bat. It allows for a quicker swing. :-)

Now, if your antenna has a large capacitive component as part of it's
input ... then quite possibly a swinging choke might help.

But, if your HV power supply needs to limit inrush currents then ...

Back to my comment. I was interrupted as my XYL was leaving for work.

Seriously, for the younger ham reader. The older AM transmitters, vacuum
tube type, required continuous plate current at rated power. It was
necessary to keep full plate current even in the absence of audio. A
swinging choke, one with an critical inductance value that changed as a
function of 'DC' current [variable reluctance] , as the first component
of a HV supply, simplified the requirements on the other components of
the HV filter circuit. Namely, the first input capacitor. High power HV
supplies were typically designed using a double 'L' filter, choke input.
The first choke provided better performance if it had a variable
reactance as a function of rectified current. The minimum value of
reactance [critical inductance] was a feature of the 'swinging choke'.

Ah!! The good old days. Radios were radios that worked all tv sets,
stereos systems, and am broadcast receivers. I ran a 6AG7/6L6 at 10
watts on 15 meters CW and worked ALL tv sets [ALL] within 1/2 mile. I
used a good quality DRAKE LP filter, a Pi network tuner, and had very
low harmonic output and still worked all TV sets.

Question to the younger crowd ... Why did I have TVI?

Cecil, you should not answer. But, I suspect you had the same
experience. Note: Cecil and I both have formal technical training.

Ham op wrote:
Question to the younger crowd ... Why did I have TVI?

Cecil, you should not answer. But, I suspect you had the same
experience. Note: Cecil and I both have formal technical training.

Back around 1954, I put 600 feet of copperweld in the air,
fed by a modified ART-13 running 500 watts. The lights
in my room would dim during key down.

The closest TV transmitter was 90 miles away in Houston.
Madisonville, TX had no TV cable system at the time. When
I fired up, I wiped out TV reception for a good 100 square
miles. My parents took the ART-13 away from me, made me take
down the 600 ft. random wire, and go back to my 40w Globe
Scout and 40m dipole. :-(

I also came through rather distorted on a local church's
sound system. Some of the congregation thought that God
was speaking to them in an unknown tongue. :-)
--
73, Cecil http://www.qsl.net/w5dxp


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and label the frequency determining elements. At least that is how I
remember it...


"David G. Nagel" wrote in message
...
Draw a Colpitts Oscillator

Dave WD9BDZ

Fred;

Worked for me....

Dave WD9BDZ




Fred W4JLE wrote:

and label the frequency determining elements. At least that is how I
remember it...


"David G. Nagel" wrote in message
...

Draw a Colpitts Oscillator

Dave WD9BDZ