Bert Gmail has been sending lots of emails to spam. "Because it appears like something else". So if I appear unresponsive I now know why. Crazy! Regards Paul WB8TSL
On Wed, Jun 18, 2014 at 3:40 PM, Ernie Peres <[email protected]> wrote: > > Hi, > > I am interested a complete KIT ready made and tested. Also if this > version is not available then just the simple KIT including PCB...parts and > so on. PIC programmed. > > Rgds Ernie. > > > > > > > -----Original Message----- > From: time-nuts-request <[email protected]> > To: time-nuts <[email protected]> > Sent: Wed, Jun 18, 2014 8:56 pm > Subject: time-nuts Digest, Vol 119, Issue 25 > > > > > Send time-nuts mailing list submissions to > [email protected] > To subscribe or unsubscribe via the World Wide Web, visit > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > r, via email, send a message with subject or body 'help' to > [email protected] > You can reach the person managing the list at > [email protected] > When replying, please edit your Subject line so it is more specific > han "Re: Contents of time-nuts digest..." > > oday's Topics: > 1. FE5680 GPS Disciplined Controller ([email protected]) > > --------------------------------------------------------------------- > Message: 1 > ate: Wed, 18 Jun 2014 14:49:02 -0400 (EDT) > rom: [email protected] > o: [email protected] > ubject: [time-nuts] FE5680 GPS Disciplined Controller > essage-ID: <[email protected]> > ontent-Type: text/plain; charset="utf-8" > > E5680 GPS Disciplined Controller > ith all the FE 5680 rubidium oscillators being used as door stops out > here some of us decided to develop a GPSDO for it. The main question we > have: > s there sufficient interest among time nuts for a discipline controller > or the FE5680 to make it available? Looking at the postings over the last > wo years I am not so sure. > he construction and preliminary testing of a Brooks Shera style GPS > iscipline controller for the later version (6.81e-13 resolution) of the > FE5680 > has been completed. We are trying to determine the number of people that > ould be interested in obtaining an FE5680 discipline controller (if there > is > ufficient interest about $45 a kit shipping included, $75 for an > ssembled and tested board, international orders for an additional $5) > when it > s > eleased. > e are also looking for three Beta testers that would be willing to > urchase, assemble, and test our Beta release controller kit with their own > E5680A and GPS receiver or Tbolt and provide feedback. Please send an > email to > [email protected]_ (mailto:[email protected]) Subject Time-Nuts FE 5680A, > f you would be interested in being one of the three Beta testers. A key > equirement is the willingness to get to it right away, the board assembly > akes about 30 minutes. Instrumentation to measure results is also a > equirement. We obtained impressive results using a cheap ublox 6M > receiver. > The FE5680 GPS discipline controller is a small (2? x 2?) board using 8 > IP?s and 1 SOT23-5 package powered by +5v with 0.1? headers for all inputs > nd outputs. Our plan is to have the kit supplier solder in the only SMD > evice on the board. A GPS receiver 1PPS and 10 MHz sine from the FE5680 > eed the board with two 9600 baud serial ports sending TTL level tuning > ommands to the FE5680 and receiving commands from and sending status data > to a > PC for data logging and system control via a simple terminal program. > n the chip count are two opto couplers that allow the use of isolated TTL > o USB conversion. These USB adapters are readily available and furnish > he 5 V necessary for the secondary of the opto circuit. An option is to > not > se the opto couplers and send the PIC TTL level RX and TX into a TTL to > S232 adapter. Another option is to use a TTL to RS232 converter after the > pto couplers but then an external 5 V source would have to be supplied for > he opto couplers. > s I mentioned before to get best performance from the FE5680 temperature > ontrol is a must and after much fan and metal work I realized that a Lap > op heat pipe is the easiest lowest cost solution. Comments appreciated. As > n alternative the temperature correction needs to be disabled. Otherwise > wo control loops fight each other. If you look close on page 7 of the > rochure temperature stability from ?10 to +60 C looks good but a closer > look > nd you see 4 E-11 changes over small temperature changes in the -10 to 60 > range. Extensive analysis has been done on the FE 5680 A and maybe some > ne can tackle that problem. Please look at what N5TNL did. It is attached > nd click on his link. The FE 5680A does have a 4 channel MAX 1246 ADC and > ost likely it is used to monitor temperature. > lso mentioned before the FE 5680 output is not the cleanest, I did > bserve it and some one posted the attached. I apologize but my records do > not > how who did, so if you posted the data please come forward. For serious > pplications where you are using it as your main reference a clean up like > the > orion MV89 or HP 10811 should be considered. > his addition is not required for beta tests but temperature control will > elp. > am also enclosing the express PCB layout, be free to use it but it would > e more economical to do a group buy if there is enough interest and some > ne steps up to kit. > ert Kehren > o not exceed the attachment limit the plot will be a separate posting > > > -------------- next part -------------- > non-text attachment was scrubbed... > ame: What is the typical drift with temperature.ZIP > ype: application/zip > ize: 31931 bytes > esc: not available > RL: < > http://www.febo.com/pipermail/time-nuts/attachments/20140618/be0c5f1a/attachment.zip > > > ------------------------------ > _______________________________________________ > ime-nuts mailing list > [email protected] > ttps://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > End of time-nuts Digest, Vol 119, Issue 25 > ***************************************** > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
