I used the noise curves to estimate what the integrator gain should be and after adjusting it for minimum noise from about 0.1 to 10 Hz, it was very close to the actual crossover point in the datasheet specifications. RMS noise was measured by taking the standard deviation of the DC values from a Fluke 8505A over 10 seconds.

If you are trying to extract frequency from the signal (you are after the center frequency of WWVB) then both the offset oscillator and the ADC clock will matter: Your baseband tone is Fwwvb - Flo = Fif Your estimate of that tone is based on the frequency of the ADC samples.

He returned > the estimated > position a few days later, expressing high confidence that it was good > within about 8 inches. > > I'm sure I asked him if this machine used both L1 & L2, but don't recall > his answer. I suspect it was "yes". It will have been using carrier phase only, not the L2 modulation (which is encrypted).

That's the only idea I can up up with off the top of my head to check whether such a patch would actually improve the clock estimate noticeably.

. >> >> SBAS (or WAAS or whatever) will improve your location estimate. In the survey in >> part of the process things might go a little better. My guess is that pretty much everybody >> *assumes* you already have a well known location for your timing device. > > I don't follow this. Differential corrections are basically deltas to > pseudoranges.

I don't worry about what time it says, but I sometimes look to estimate total power outage time (can be quite a lot up there) since the last reset. I think it's around sixty years old. It has the flag indicator as described, that resets when you pull the time set knob at the bottom.

By the way: can you estimate the room temperature which was during the experiment? >From your description of thermal shielding I got the impression that on the 0 degrees orientation is with the legs of the LTZ above the metal can. Or did I mis-interpret the description? On the other side the PCB could be mounted vertically in the case.

(That's an estimation by Joe Gellers series number collection) As the 3458A is a niche product with homeopathic series volume, the development, verification/validation, special reliability engineering, selection and burn-in measures, QA costs had to be paid per unit in the beginning.

Here are some highlight estimated numbers, in ad hoc sequence, before processing data and photos from all team observers (a trip report, including numbers by location, will be available in a week): SKUA spp, 4-5 (one was seen better and identifiable as a Great), mostly in association with flocks of Great Shearwaters. Northern Fulmar, 20.

Please be sure to estimate your time spent in the field in your reports to help track level of effort. Thank you! Patrick Patrick M. Comins, Director of Bird Conservation, Audubon Connecticut Phone: (203)405-9115 Your Legacy is Audubon's Future!