[time-nuts] ko4bb monitor
eb4apl at cembreros.jazztel.es
Thu Feb 18 00:20:36 UTC 2010
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.
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.
> 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
> 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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