[time-nuts] A few questions about Tboltmon

Bryan _ bpl521 at outlook.com
Thu Aug 6 01:13:13 EDT 2015

Did you do 48 hour precision first survey first to get an accurate Lat/Long/ altitude?. You will probably need to start with a cold reset to erase any previously stored data and then perform the survey.


> Date: Wed, 5 Aug 2015 19:16:23 -0700
> From: kd4pbj at gmail.com
> To: time-nuts at febo.com
> Subject: [time-nuts] A few questions about Tboltmon
> Hi,
> I got my new Thunderbolt up and running this past weekend but I have a few questions. I understand Lady Heather is a better program, and I have downloaded it. However right now I am trying to get things right with Tboltmon first. I had used it with my previous GPSDO, a Starloc II. I hate to say but the Starlic just worked, so I didn't pay much attention to Tboltmon other than to see that I was seeing satellites. Please forgive me if some of the questions may sound simplistic, but I'm sort of new to being a time nut. 
> The Thunderbolt is brand new in package. I purchased a Power One open frame supply from EBay that was also new old stock. Before connecting it to the Thunderbolt, I went ahead and ordered new electrolytic caps from Mouser and spent last Friday night recapping the Power One box. I measured the outputs with a DMM to make sure I had 5 V, -12 V and 12 V. 
> Noticing that in my old antenna location I could now only see 1-2 satellites (trees have grown a bit) I moved the antenna to the roof of my house, attached to a plumbing vent pipe, with a completely open view of the sky here on top of a mountain in Tennessee. 
> Here's what I am noticing:
> To start with I simply turned on the Thunderbolt on Saturday morning without doing a warm or cold reset. Within a few minutes, I was seeing six or seven satellites, with the SV boxes lit up green with various numbers which I assume are satellite ID numbers. When I woke up Sunday I was down to seeing only two satellites. The numbers listed were different than the ones I saw before I went to bed Saturday.  But when I unplugged the AC power from the Thunderbolt and plugged it back in, I was back to six satellites. 
>  I had thought that the GPS satellites I am able to see from my location are fixed 24/7. Do they move and different satellites come into view with rotation of the earth?
> I did a warm reset when I got up at 4:45 this morning and when I got home, four satellites were still green on Tboltmon. About an hour ago I went ahead and did a cold reset. 
> I now have 6 satellites where the SV is green, and one with a yellow SV with a value of 7.0. 
> All critical alarms are green, and all minor alarms are green except position questionable which is yellow. That has been yellow since Saturday. 
> Under the Disciplining status, Mode is (0) Normal and Activity is (0) Phase Locking. 
> The Timing Outputs are all over the place and have been since Saturday. Twenty minutes ago I got:
> PPS  -106588.28 ns GPS
> 10 MHz  166.08 ppb
> So far today I have gotten the following ppb readings:
> -41.48
> 374.30
> 0.48
> 0.70
> Should the Timing output variance concern me? 
> Thanks in advance for any help or advice. 
> Chris
> Monteagle, TN
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