You should check out the info I did when I did some reverse engineering on the
5650A...
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:rubidium_oscillators
_
Hotmail: Trusted
It may be that shifting the voltage will mess up the calibration constant
in the synthesizer?
Don
Raj
Angus informed that the two buttons are for shifting the freq. up or down,
after one single click the adjustment range is around the center.
Suspect thats adjusting the c field. Would not
Angus informed that the two buttons are for shifting the freq. up or down,
after one single click the adjustment range is around the center.
Suspect thats adjusting the c field. Would not hurt especially if the unit
was used/surplus.
Try 4000.
On Mon, Feb 15, 2010 at 12:44 AM, Raj
Suspect thats adjusting the c field. Would not hurt especially if the unit
was used/surplus.
Try 4000.
On Mon, Feb 15, 2010 at 12:44 AM, Raj vu2...@gmail.com wrote:
In my FE5680, I find that the trimpot for frequency adjust at one
end 4.4V. The upper and lower voltages are 4.4 and 5.2
Hi
There is a lot of data on the small FE rubidiums out there. They appear to have
re-packaged the same basic electronics into several different packages. You may
want to dig into some of the other models to get a complete idea of what's
going on with your unit.
I would not worry a lot about
I tried a 470 in parallel and the min. voltage came down to 3.6 or so. This
did not seem to help much. 20:00 here, will try and experiment tomorrow.
A schematic would help to understand this. Any available ?
There seems to be more trimpots and a couple of buttons the functions
I have no clue
Hi
In general there are no real schematics available on any of these compact Rb's.
Many of the extra post and jumpers are related to setting up the physics
package. Without a very good understanding of what they do, you really can't
touch them.
Since the unit can be digitally tuned, I would
Thanks Bob, As you guys mentioned its addictive !
I was planning to use these units as a quick frequency reference.. warm up for
a short while and then use as reference. My GPSDO seems to be fine! I am
comparing the GPSO with the Rb unit.. maybe the GPSO is off ?? this is a one
clock, two
Hi
The GPSDO should be pretty good at reporting it's own health. Lady Heather and
the other programs are very useful to decode the binary stuff that the
GPSDO's commonly put out. If everything has been on for a week or so, I would
trust the GPSDO to be close enough to tell you what's going on.
In my FE5680, I find that the trimpot for frequency adjust at one end
4.4V. The upper and lower voltages are 4.4 and 5.2 approx.
Does this mean it is at the end of its life?
There is a 4750 Resistor connected to the low end of the trimpot whose
value can be reduced
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