5MHz was quite common back then, it had to do with the fact that 5MHz XO had a better phasenoise, you will also find 5MHz on many older rubidium and cesium beam standarts.
You have basically two options, the first one is to just use a 2/1 frequency divider, you can find those at any semiconductor company fairly cheap, the other solution which is a bit more intricat is to use a DDS chip to generate your 5MHz out of a 10MHz XO
"Richard W. Solomon" <w1ksz@...> wrote:
After moving to Arizona I know have at least one of my GPS Stabilized
Oscillators up and running. I intend to use the 10 MHz output as the
External Reference for a couple of EIP Counters and I had hoped my
8640B. But, HP in their infinite wisdom, has deemed that a 5 MHz
reference is needed. Is there any way to change that from 5 MHz to 10
MHz ? Maybe I should just stick 10 MHz in and see what happens ??
Any thoughts on this ?
Thanks, Dick, W1KSZ/7
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