Hi Unless you have a very fancy receiver, the cabling should not matter much. The antenna is a bigger issue, but again it depends on just how fancy you are getting and how good the antenna is. Right now, I would not worry about either one. Use good quality RG-6 quad shield satellite TV coax and it should be fine.
Location of the antenna matters more than either of the above. You want a good view of the southern sky. Bob On Dec 15, 2012, at 9:02 AM, Fabio Eboli <[email protected]> wrote: > Thank you all for the advices. > I will prepare the setup for a longer logging session, > using an inverter and a battery for power backup. > > Now I'm starting building of a clock shaper > and a divider for the 10MHz signal, I will use > 7AC gates for both the squarer and divider, since I > have many of them here, no need to buy anything. > > The question is: watching the previous log, > how much will the results be influenced by > the GPS antenna and it's cabling ? > (now I'm using this one: > http://www.mirifica.it/store/gps-antenne/347-globaltop-fgpane-sma-5-m.html) > > Thanks, > Fabio. > > Azelio Boriani <[email protected]> ha scritto: > >> Yes, this is the typical GPS receiver PPS wander. It is usable for a GPSDO >> as it seems of timing quality (the Motorola M12M is -20nS..+20nS over 10 >> days). >> See: >> >> http://www.jackson-labs.com/assets/uploads/main/Motorola_M12.pdf >> >> on page 7. >> >> On Thu, Dec 13, 2012 at 2:47 PM, Bob Camp <[email protected]> wrote: >> >>> Hi >>> >>> Ok, those plots look much more "real". Thanks for sharing. >>> >>> Bob >>> >>> -----Original Message----- >>> From: [email protected] [mailto:[email protected]] On >>> Behalf Of Fabio Eboli >>> Sent: Thursday, December 13, 2012 7:58 AM >>> To: [email protected] >>> Subject: Re: [time-nuts] MT3339 PA6H and Racal Dana GPIB, update >>> >>> Bob, timenutters >>> here are the first results, hope >>> I'm not boring the members with these >>> posts, for most participants these >>> are basic things. >>> Now I'm trying to understand if the >>> setup is working or I have to modify >>> some things. >>> >>> The logging is at 47000 samples and going, >>> the script is working well now, and I dont >>> have glitches so far. >>> Raw data, time interval between the pulses: >>> http://www.flickr.com/photos/14336723@N08/8269800802/ >>> >>> Positive thing is that the drift seem consistent >>> with the previous decimated pulse period data. >>> >>> Data corrected for linear drift and offset, the >>> actual values are in the graph: >>> http://www.flickr.com/photos/14336723@N08/8269800868/ >>> >>> Here I dont' like very much what I see, >>> but surely I'm not knowledgeable enough >>> to judge the data :) >>> >>> Some notes for who didnt read previous posts: >>> Racal 1992 counter, start on pps from FE5680 #1 >>> stop on gps pps from PA6H GPS module, >>> Counter External standard is 10MHz from FE5680 #2. >>> >>> The Fe5680 #2 was powered one hour before the >>> session start, and it's mounted near the FE5680 #1, >>> so there is some thermal stabilization >>> in the first hours. >>> Also I dont have any signal amplification and >>> squaring, the trigger on the counter is set >>> at half the pulse peak voltage, both rising >>> edges. >>> >>> Is the graph what I should expect from the gps >>> signal, or I'm seeing some problems in the >>> setup? >>> >>> Thanks, >>> Fabio. >>> >>> Bob Camp <[email protected]> ha scritto: >>> >>> > Hi >>> > >>> > That approach works well. If you have them about a half second apart >>> > I'd stick with that setup. >>> > >>> > Bob >>> > >>> >>> >>> ---------------------------------------------------------------- >>> This message was sent using IMP, the Internet Messaging Program. >>> >>> >>> >>> _______________________________________________ >>> 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. >>> >> _______________________________________________ >> 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. >> > > > ---------------------------------------------------------------- > This message was sent using IMP, the Internet Messaging Program. > > > > _______________________________________________ > 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.
