[time-nuts] FTS 1050A

[Max Robinson]

If you use a D flip flop as a mixer it will produce the difference only. 
You have to get the D and clock signals right I forget which one has to be 
the highest frequency to make that work.

Regards.

Max.  K 4 O D S.

Email: max at maxsmusicplace.com

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----- Original Message ----- 
From: "ed breya" <eb at telight.com>
To: <time-nuts at febo.com>
Sent: Tuesday, August 09, 2011 4:05 PM
Subject: [time-nuts] FTS 1050A


> If you just want to get it to an integer value, I recommend, for example, 
> that you find or make a 6.0000000 MHz VCXO using a common 6 MHz crystal, 
> and mix it with the 6.000300 MHz using a 74HC86 XOR, then the 300 Hz IF 
> can easily be low-pass filtered out and used as the feedback to a PLL 
> (like 74HC4046A) which drives the VCXO. The other input to the PLL can be 
> made by dividing the VCXO output by 20,000 (with 74HC390s), resulting in 
> 300 Hz as a reference. The net result is that the ovenized oddball 
> reference will phase lock the common-frequency VCXO - but only close-in 
> since the sample frequency is only 300 Hz - farther out phase noise will 
> depend on how clean you make the VCXO. Once you get 6.000000 MHz, you can 
> make whatever you want. With a little more complexity there are lots of 
> combinations that could make a nice integer value (like 10.000000 MHz), 
> and at a higher sample frequency - you just have to figure out what you 
> can add, subtract, multiply and divide with convenient values to get 
> something usable.
>
> Ed
>
>
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