Re: LF: Idiot's guide to receiving Ebnaut? - Tutorial part2

[Wolfgang Büscher <dl4yhf@freenet.de>]

Hello Jim,

I wouldn't give up on the Thunderbolt E yet. A double-ovenned 10 MHz 
sounds intriguing, you should have a very low phase noise which other 
GPSes (clocked by a cheap 'computer grade' oscillator) cannot achieve. 
It will be interesting if you use the Thunderbolt to trigger a digital  
oscilloscope, and measure the PPS signal from the chinese unit at a 
resolution of a 10 ns or so.
With a simple pulse-shaping network (CMOS 4093 wired as a crude 10 us 
monoflop), the pulse digitized with an E-MU0202 look good enough to be 
used as a timebase with SL. I will play with a modified algorithm, and 
see how it compares with the edge-interpolation on the 100 ms pulse from 
the Garmin - also at lower sampling rates (with sampling intervals 
longer than 10 us).
Cheers,
  Wolf .