From: "Tom Van Baak" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Z3801A predicted holdover phase drift convergence Date: Mon, 1 Aug 2005 17:52:00 -0700 Message-ID: <[EMAIL PROTECTED]>
> Is that a typo: 100-200 us? I am sorry to say no, it is not a typo. This is why I started to wonder. > Check out: > > http://www.realhamradio.com/GPS_websites_list.htm > > 10 us to 1 us or even sub-us is ok. But if it's > really over 100 us something for sure is not > working right. Which I assumed. > Send me a some plots and we can work it out. Antenna type; feed cable, > obstructed sky view, signal level, number of sats in view, surveyed position, > etc. All in due time. Also, I have yeat to move the antenna. Currently I have the antenna with its 6 meter long cable hooked directly to the Z3801A using only the necessary BNC to N adapter. The antenna is not the most phase-stable one around, a no-namer really. My signal levels is usually in the 80-100 range for a few satellites (1-3) and then about 1-3 reaching the other span (20-79). Usually have something like 4-5 satellites. Antenna position is not optimal, but at least some consideration of unobstructed skyview. A real scetch is however a little hard to acheive. Cheers, Magnus > /tvb > > ----- Original Message ----- > From: "Magnus Danielson" <[EMAIL PROTECTED]> > To: <time-nuts@febo.com> > Sent: Monday, August 01, 2005 14:48 > Subject: [time-nuts] Z3801A predicted holdover phase drift convergence > > > > Hi! > > > > I have been monitoring my Z3801A and noticed that the predicted hold over > > time/phase drift (i.e. frequency error) is fluctuating in the 100-200 us > per > > day range. Am I expecting too much, or should I really expect this to be > an > > acceptable level? > > > > Recalculating it to frequency error it would be an initial fractional > frequency > > error of 1,157E-9 to 2,315E-9. That is not bad, but I would assumed a > little > > better without thinking things thru. If somebody done the thinking, please > > enlighten me on the details, I am sure it will make sense. > > > > Cheers, > > Magnus > > > > _______________________________________________ > > time-nuts mailing list > > time-nuts@febo.com > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > > > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts