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Doubling a reference frequency

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August 27th 04, 06:06 PM

Paul Keinanen

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On Fri, 27 Aug 2004 07:32:37 GMT, (Mike W)
wrote:

GM Folks,
My 10Mhz TCXO that I use for a frequency counter timebase has gone
toes up and I only have a 5Mhz one available to replace it. Can anyone
offer ideas to double the 5 Mhz TCXO keeping the M:S ratio accurate
enough for use with the frequency counter ?.

If you are just going to drive the gate of the frequency counter, the
gate is typically 1 s, 100 ms, 10 ms etc. so the 5/10 MHz reference
frequency is divided down a few times anyway, so why do you need the
50:50 mark:space ratio ?

The frequency divider chain will change on either on the leading or
trailing edge of the clock (but not on both), so the gate time will be
1.000000 s regardless of the mark/space ratio, provided that the clock
mark/space ratio remains constant.

Paul OH3LWR

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