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.
