[time-nuts] Progress on the FE-5680A serial commands!

[EWKehren at aol.com]

Maybe there is a way to vary the C field through a digital command,   in 
one of their specifications I noticed a spec that stated that the frequency  
can be set in 1 E-13 steps. Is there a DAC on the board?
Bert Kehren
 
 
In a message dated 1/20/2012 12:52:48 A.M. Eastern Standard Time,  
newell+timenuts at n5tnl.com writes:

Here's  some data from one of my working FE-5680A  units:

http://n5tnl.com/time/fe-5680a/graphs/fe5680_2_ch3.png
http://n5tnl.com/time/fe-5680a/graphs/fe5680_2_ch4.png

This  assumes that the reply from the undoc command 0x5a is the raw 
counts from  the 4 channel 12 bit ADC.  I think channel 3 is a temp 
sensor.   What would channel 4 be?  Photodiode output?

Channels 1 and 2 are  pretty much a straight line.  I think Pete 
figured out channel 1 was  connected to a trim pot, right?  Channel 2 
sits at 2100 counts or so  from power up 'till down, so I'm guessing a 
supply rail.

Running  graphs now for the problem child.  Hopefully this weekend 
I'll be  able to run two Rbs at the same time and see about tweaking 
the freq on  the bad one.

-- 
newell  N5TNL


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