Re: [time-nuts] GPSDO - internal connections question
Well one point to add to all this. Some time-nuts are hams, some are not. You comment "Used in hamshack" suggests you are a ham. RF interference from your radios will be a problem. It can modulate the EFC and upset things. Granted it will normal up after a while. So do consider a metal box and do use shielded cables. Ground only one end of shield. Might want to consider beads on the rs 232 lines etc. Simply use good amateur radio design/construction techniques. By the way I have a VE2ZAZ system works quite well and for Amateur use is great. Regards Paul WB8TSL On Thu, Sep 22, 2011 at 5:25 AM, Attila Kinali wrote: > On Wed, 21 Sep 2011 18:36:43 -0500 > Chris Howard wrote: > > > Thanks! > > Would it do any good to have the control board, GPS, or anything else > > within > > its own shielded box? > > I'd put everything into one big metal box, but seperate the different > submodules, probably shield them from each other. > > Please remember, that you are doing analog design on the EFC/OCXO side. > This means that you have to have low noise levels where you handle these > signals. This in turn means that you want to keep all digital electronics > as far away from it as possible. > > Also think about a proper grounding scheme, as you connect the various > submodules together, otherwise ground loops will introduce additional, > hard to contain (and quite potent) noise. > >Attila Kinali > -- > WYSIWYG is not a solution, it is the problem, and until we get around to > realizing that very few of us are competent to design fonts, styles, or > layout (14-year-old girls who dot their i's with hearts excepted, of > course, > the exception that nails down the lid on the coffin), we're going to have > to > live with that crap. >-- Stephen J. Turnbull in a discussion about word processors > > ___ > 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.
Re: [time-nuts] GPSDO - internal connections question
On Wed, 21 Sep 2011 18:36:43 -0500 Chris Howard wrote: > Thanks! > Would it do any good to have the control board, GPS, or anything else > within > its own shielded box? I'd put everything into one big metal box, but seperate the different submodules, probably shield them from each other. Please remember, that you are doing analog design on the EFC/OCXO side. This means that you have to have low noise levels where you handle these signals. This in turn means that you want to keep all digital electronics as far away from it as possible. Also think about a proper grounding scheme, as you connect the various submodules together, otherwise ground loops will introduce additional, hard to contain (and quite potent) noise. Attila Kinali -- WYSIWYG is not a solution, it is the problem, and until we get around to realizing that very few of us are competent to design fonts, styles, or layout (14-year-old girls who dot their i's with hearts excepted, of course, the exception that nails down the lid on the coffin), we're going to have to live with that crap. -- Stephen J. Turnbull in a discussion about word processors ___ 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.
Re: [time-nuts] GPSDO - internal connections question
On 9/21/2011 4:08 PM, Bob Camp wrote: Hi Twisted pair is fine for the EFC. Shielded twisted pair (one end grounded on the shield) might be slightly better). A lot depends on how many yards long the EFC wire is :) Bob Thanks! Would it do any good to have the control board, GPS, or anything else within its own shielded box? ___ 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.
Re: [time-nuts] GPSDO - internal connections question
Hi Twisted pair is fine for the EFC. Shielded twisted pair (one end grounded on the shield) might be slightly better). A lot depends on how many yards long the EFC wire is :) Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Howard Sent: Wednesday, September 21, 2011 4:46 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] GPSDO - internal connections question I'm building a GPSDO using the VE2ZAZ board, an HP 10811 oscillator and a Trimble Resolution T GPS. My goal is a simple and cheap 10 Mhz standard for my little home electronics bench and ham shack. I have my power supply parts finally gathered up, now I have these boards that need interconnecting. I'm thinking I need to use coax cable for anything that has 10 Mhz on it. Do I need to shield the control voltage going to the oscillator ___ 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.
[time-nuts] GPSDO - internal connections question
I'm building a GPSDO using the VE2ZAZ board, an HP 10811 oscillator and a Trimble Resolution T GPS. My goal is a simple and cheap 10 Mhz standard for my little home electronics bench and ham shack. I have my power supply parts finally gathered up, now I have these boards that need interconnecting. I'm thinking I need to use coax cable for anything that has 10 Mhz on it. Do I need to shield the control voltage going to the oscillator ___ 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.
