[time-nuts] TRAK Model 8900-1 GPS Disciplined Freq Std

Alexander Imas imasalex at gmail.com
Thu Dec 16 08:09:36 UTC 2010


Hello Greg

Many thanks for your response.
At least I learned something......
Do you have any idea where I can get this part (GPS synchronizer Model
8901-1 ) ?
Do you familiar with any suppliers of TRAKs old products , cause they do not
produce it anymore .


Thanks again
Regards,

Alex

On Thu, Dec 16, 2010 at 8:08 AM, Greg Burnett <gbusg at comcast.net> wrote:

> I bought the TRAK 8900-1 on eBay five years ago.  Because the 8901-1 GPS
> synchronizer module wouldn't lock, the seller sent me a replacement 8901-1,
> but I was unable to get it to lock either. My system didn't come with an
> antenna. One issue was that the system supplied 12VDC (instead of the more
> common 5VDC) to the active antenna. TRAK wanted a "fortune" for their
> replacement antenna, so that option was out. I finally figured out that,
> apparently, the 8901-1 had a current sensing circuit in its power supply
> for
> external antenna. The circuit was apparently configured to disable lock
> unless the antenna dc power supply current was within a specified "window".
> My substitute antenna apparently didn't draw enough DC current to make the
> circuit happy. So I ended-up soldering a 1k ohm resistor, on the board, in
> parallel with the antenna connector, in order to "trick" the sensing
> circuit
> into its "good" window.  That made it work, and it locked just fine. (Note:
> I no longer have the 8900-1, so I'm going by memory regarding the 1k ohm
> value.)
>
> I might still have the defective, 2nd 8901-1 GPS synchronizer around here
> some place. But I just looked, and tentatively don't see it anywhere. I've
> moved twice since I bought the TRAK, so it might be misplaced or hidden in
> some box somewhere?
>
> Best,
> Greg
>
>
> ----- Original Message -----
> From: "Alex Imas" <imasalex at gmail.com>
> To: <time-nuts at febo.com>
> Sent: Tuesday, December 14, 2010 3:07 PM
> Subject: [time-nuts] TRAK Model 8900-1 GPS Disciplined Freq Std
>
>
> Hello
>
> I found Greg Burnett page with question about TRAK model and I have a
> question, too.
> Maybe you can help, where did you buy this unit cause I'm looking for GPS
> synchronizer Model 8901-1 , for our  Trak Modular Frequency/Time System
> Model 8900-50 and TRAK stopped produce it
>
>
> Best regards
> Alex
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>


More information about the time-nuts mailing list