Hi Jim, Yes I did, no value was perfect in this respect, ie as affecting the DAC steps, so settled on 20 as a bit of a compromise. The number of sats being tracked still seems to be a factor in the equation, setting an elevation angle of 20 degrees had quite a smoothing effect last night, today I'm back to much more noticeable steps again. Although I have used Lady Heather in the past I've tended rather to stick with Trimbles own more simplistic software for making basic adjustments and just to ensure things are set up and working ok, so I'm back on a fairly steep learning curve and perhaps being given too much information for my own good:-) Regards Nigel GM8PZR In a message dated 06/08/2013 01:15:17 GMT Daylight Time, wb4...@wb4gcs.org writes:
Did you /increase/ the elevation mask? Jim wb4...@amsat.org On 8/5/2013 8:06 PM, gandal...@aol.com wrote: > Many thanks to those who commented on this and apologies for the delayed > response, having spent a few days in an internet free zone I've also had to > contend with a couple of power failures since returning but am just about > getting back to normal again, whatever normal might be:-) > > As suggested, changing the elevation mask does make a difference to the DAC > voltage jumps, I'd just run up Lady Heather on default settings to start > with which sets it to 10 degrees and changing that to 20 degrees, for > example, has reduced the steps in the DAC voltage as sats come and go, they're > still there but not so pronounced. > > Having said that, comparing this with a Thunderbolt, albeit using another > Thunderbolt as the reference for both, does tend to give more pronounced > steps on the Thunderbolt for the same elevation mask and sensitivity settings. > As others have commented previously I'm also noticing the much reduced > temperature sensitivity of this unit compared with the Thunderbolt which is > quite a big plus, but it's not all totally one sided, both Lady Heather and a > couple of Pendulum counters are showing somewhat lower Adev values for the > Thunderbolt although the plots of frequency against time show very similar > limits. > > Either way, so far at least this does seem to be working well. I still > haven't heard from anyone who's run the two available GPSTM variants side by > side so I'm still debating whether or not to try that for myself, or whether > to just quit whilst I'm ahead:-) > > Regards > > Nigel > GM8PZR > > > > > > > > > In a message dated 31/07/2013 22:48:13 GMT Daylight Time, gandal...@aol.com > writes: > > Having stuck a late bid on a recent auction for what I'd assumed was a > Trimble Nortel NTGS50AA I then realised I'd just bought the single board > version, part number 4500-00-CH with the Trimble 49422-CR OCXO. > > That in itself wasn't a problem, except perhaps the doubts cast over my > sanity:-), it arrived earlier today and has been running for several > hours > now, chatting comfortably with Lady Heather, and generally settling in > nicely. > > However, it does prompt the question, has anyone had a chance to compare > one of these side by side with an NTGS50AA and, if so, were there any > obvious differences in performance? > > Regards > > Nigel > GM8PZR > > > _______________________________________________ > 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 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.