[time-nuts] FA-2 questions

[Bob kb8tq]

Hi

Taking the “questions” topic in a bit different direction …..

If the FA-2 is like the other projects from the same people, there is active work being done
on the project. That is likely to create updated code for the device as issues are spotted. Is
anybody on the list linked into that side of things? 

Given the number of people who seem to have them, it probably would be a good idea to 
come up with a way to monitor what’s going on with the original project. As time goes by, 
it might not hurt to watch for firmware / rev number changes on newer purchases. 

So another question: what firmware / rev’s do people have now? 

Bob

> On Oct 12, 2019, at 7:45 PM, Perry Sandeen via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Yo Bubba Dudes!,
> First, does the internal OCXO run when the power is turned off?
> Wrote:
> We are presently experimenting using a ISC570B  multiplier at 100 MHz and get 13 digits seeattached but the data out of the back is only 12 digits reliable.
> Looking it up I found out that the ISC570B is a teeny - tiny IC which for me would pose a problem to implement. 
> 
> So looking at alternatives that I already had I came up with two possible alternative multiplier ideas.
> The first was to put the 10 MHz DUT into the external reference of my (boat anchor) HP signal generator set the output frequency to 200 MHz and put the output into the channel 1 input to get extra resolution digits.
> Expanding upon that, I came with more complex but what may be a better error multiplier reading since I have both signal generators on hand.
> First I feed the 10 MHz DUT signal into my Fluke 6080 setting the output to 1 GHz.  I'd then feed the reference 10 MHz signal into the external reference of my HP 8656 and set the output to 990 MHz.
> Next I'd feed both outputs into a  
> AD8342 LF to 3.8GHZ Active Mixer Down conversion Output withBalun Transformer
> 
> board from ebay ($23) and then feed the multiplied signal into channel 1. (I may need a simple low pass filter.)
> 
> 
> This should give me a 100X error multiplication. 
> 
> 
> Am I on the right track or am I missing something?
> 
> 
> Regards,
> Perrier
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.