[time-nuts] ko4bb monitor

[EB4APL]

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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