[time-nuts] Simple 5 to10MHz frequency doubler

Richard Karlquist richard at karlquist.com
Mon Dec 27 15:56:36 UTC 2010


 On Mon 27/12/10 3:28 PM , "Alan Melia" alan.melia at btinternet.com sent:
 Hi I have just broken up an old 10-Base-T 16 ay switch and recovered 16
DIL
 filter/isolating transformers ( identified as a 10F434 from YCL) ....and
the
 spec an pin-out was still available on the YCL web site.....worth a look
for
 10MHz distribution??

 I am concerned that a narrow 10MHz filter might give significant phase
 shifts (the YCL is a LP) is this likely to be a problem??

 Alan G3NYK

 --------------------------------

 Yes, this type of filter will have a temperature dependent phase shift,
 which can show up as a measurable frequency shift if the temperature
 is ramping.  In the 5071A, we eliminated these sorts of circuits for
 this reason.  Another reason was to get rid of adjustments.  In
 the 5071A, we use a larger number of fixed low loaded Q filter
 elements rather than a few adjustable high loaded Q filter elements.
 In a doubler (as opposed to say a X7) there is no need to have any
 high Q resonators.

 Rick Karlquist N6RK

 


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