Hello Bert, The boards look nice but tell me nothing of the circuitry. How about sending the schematics ?? That way I can appreciate what it is that you have.
Bill....WB6BNQ p.s. By the way, what ever happen with that DMTD you were going to produce about three years ago ? ewkeh...@aol.com wrote: > Attached is my latest ExpresPCB layout of a GPSDO. A clear understanding > of the GPS limitations, a goal as to what I want to control ,focus on > attainability, reproducibility KISS, cost and tests of partials on > development > boards and what you see if you download the ExpessPCB software is on the > right the saw tooth correction, in the middle the analog board with opto > isolation to prevent ground loop and on the right the actual GPSDO. This > particular unit also allows you to link a 20 Hz offset FRS-C (part of my dual > mixer) to my house reference. Total material cost depending how many boards > one > buys is below $ 40. I will include this particular board along with other > designs on my next order and subsequently cut with a sheer. > The board on the right could be used by itself with minor modifications to > directly drive a FE 5680 if some one would step up to the task. Total cost > below $ 15. I use the analog board, which by the way is the most expensive > since it has a LTC 1655 and REF 02. > No dither 16 bits, dither 18 bits and depending on loop time, clock > frequency range starting at 3 E-9 and resolution up to 6 E-16. > Again I am only interested in to controlling a Rb which gives me way more > flexibility, the Rb's are either modified with a 10811 or in one case with > the M1000 and in the case of the FE 5680 a MV89 with a separate analog loop. > And in all cases the RB is temperature controlled. > All this based on over 10 years of work with the Shera controller, > exclusively controlling Rb's. > Bert Kehren > One more thought you may want to look at a 1 $ gate array for all your > timing issues. Simplifies the work dramatically. With the long loop times > associated with Rb and high sample rate, 100 psec. are no problem. > > ------------------------------------------------------------------------ > Name: Shera 3 board.pcb > Shera 3 board.pcb Type: PCB Wizard Document > (application/x-unknown-content-type-PCBWizard.Document) > Encoding: base64 > > ------------------------------------------------------------------------ > _______________________________________________ > time-nuts mailing list -- time-nuts@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@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.