Arthur,
I did some reverse engineering in the units I bought from Amazon. I got
the schematics and it looks like the communication is by means of I2C.
If somebody is interested let me know and I'll send him the schematics.
Regards,
Ignacio, EB4APL
---------------------------------------------
EB4APL wrote:
Arthur,
I received the units I bought from Amazon. I was planning to normally
use them in the front panel of future projects in the same way you did
with the fluke.1 unit, but now I wonder if you or somebody else
figured out how to communicate with the original iCruze units. Maybe
they are programmed to be just a 2 line ASCII serial display, because
in that case they can be used for a variety of monitoring tasks
without modification, just tailoring the data to be understandable by
the module.
I powered one of my units and found it sends a 5 to 0 volts negative
going pulse of about 2 ms every 1.6 s on the yellow wire, but I didn't
tried to send anything to the green wire yet.
Regards,
Ignacio, EB4APL
--------------------------------------------------
Arthur Dent wrote:
Although the Icruze module fluke.l sells is in a nice
package for mounting on the dash
of a car, I chose to build it into the same case as I did
the Thunderbolt, power supply,
and distribution amplifier. The power and RS-232 signal for
the display is tapped off the
p.c. board of the thunderbolt so the RS-232 connector on the
back is still free to be used
with my computer to monitor the unit. The 10Mhz output from
the T-bolt has a BNC jumper to the input of the distribution
amplifier that has
3 Q-bit amps & 1 unamplified
output that allows me to monitor the output of the T-bolt
directly. Here are two photos of the unit I threw together. I think
it makes a nice inexpensive
GPSDO package.
Inside
http://farm3.static.flickr.com/2715/4307285530_4222e414ff_o.jpg
Front
http://farm3.static.flickr.com/2798/4307285448_1921a16b26_o.jpg
In the photo of the front of the unit, to the right of the T-bolt, is
a RFTG-u
Ref 1 (HP Z3811 with a MTI 260 OCXO) that I modified to run correctly
without the interface cable and companion Ref 0 unit. That has a nice
stable 5Mhz output feeding
a FE-7921A 5Mhz distribution amp. I’m using a Philips PM6680 counter
with an
X72 Rb timebase and aPhilips PM3375 scope for quick frequency checks.
Works quite well to compare the 2 GPSDOs.
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