[ARC5] "Re-Banding" SCR-274N

[Michael]

Check out http://jlandrigan.com/ and go to the article on frequency doublers
and/or the one on frequency multipliers at http://www.qsl.net/va3iul/ .
They explain it far better than I could.   

 

Best Regards,

 

Michael, K3MXO, CBLA #6, BL01hx15np24 ... or there abouts  

Sometimes I pretend to be normal but it gets boring so I go back to being
me.

 
<blocked::blocked::blocked::blocked::http://www.nationalmssociety.org/chapte
rs/NTH/index.aspx> http://www.nationalmssociety.org/chapters/NTH/index.aspx

 <blocked::blocked::blocked::blocked::http://wh7hg.blogspot.com/>
http://wh7hg.blogspot.com/

 
<blocked::blocked::blocked::blocked::http://kludges-other-blog.blogspot.com/
> http://kludges-other-blog.blogspot.com

Hiki Nô! 

  _____  

From: Dennis Monticelli [mailto:dennis.monticelli at gmail.com] 
Sent: Tuesday, 25 March, 2014 17:36
To: Michael
Cc: ARC-5
Subject: Re: [ARC5] "Re-Banding" SCR-274N

 

Michael,

 

Why would one end up with half the power?   There is a center-tapped
secondary on the osc coil.  One half drives the paralleled grids of the
1625's, the other half drives the neutralizing cap, and the center tap
develops the class C bias.  The mod would only require moving one of the
grid wires to the neutralizing cap side of the secondary. The total drive
power and the voltage drive level to each grid would remain the same.   The
only difference is that instead of the 1625's summing their cathode pulses
in the same phase of the osc cycle, each delivers its cathode pulse (of the
same magnitude as before) twice per cycle.  Am I missing something?

 

Dennis AE6C

 

On Tue, Mar 25, 2014 at 8:16 PM, Michael <k3mxo.hi at gmail.com> wrote:

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of Dennis Monticelli
> The best way to double is to move the secondary connections of the osc
> transformer to drive the 1625's in push-push.  I've always wanted to try
> that.

This works however you also wind up with half the output power.  This is one
of the disadvantages of a push-push doubler.


Best Regards,

Michael, K3MXO, CBLA #6, BL01hx15np24 ... or there abouts
Sometimes I pretend to be normal but it gets boring so I go back to being
me.
http://www.nationalmssociety.org/chapters/NTH/index.aspx
http://wh7hg.blogspot.com/
http://kludges-other-blog.blogspot.com
Hiki Nô!

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