Miguel Checa wrote: > Hi group! > > I need some opinions, counsel, help, whatever you can send my way: > > I need to maintain the Mini-T within 20 Hz p-p in a 24 h period. I use > T=450 and all is well until the thing starts to lose satellites one by > one and goes into holdover and after a while, the VCO voltage jumps to > the start value and with it the frequency (up to -150Hz). > > The antenna is not in a good place and it can't be moved, but if I > restart the Mini-T, all satellites that were grayed out come alive and > strong. Any clues? > > Thanks, > > Miguel > W4/LU9AXC > > > Miguel
20Hz is a fairly wide tolerance that one could easily maintain with a good OCXO with periodic manual frequency adjustments of perhaps once per year. If the Mini-T never sees a sufficient number of SVs uninterrupted for somewhat longer than 450 sec then you need to reduce T to a value such that sufficient SVs are seen for longer than T. Do you have anyu idea of sky coverage and maximum observed SV track lenghts? Bruce _______________________________________________ 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.
