I've done the math subtracting both skips and my clock bias's and frequency
drifts from sirf msg30 (prn30) that were posted on timenuts earlier this week;
1.3331348485e-006 3.6930953087e-012 my data
1.3294251003e-006 3.6977287551e-012 skips
.0037097482e-006 -.0046334464e-012
3.709748ns -4.633446e-015
Skip's gps clock is 3.7 nanosec slower than my gps clock.
And our gps internal oscillators differ in frequency by -4.633446e-15.
this could be a timenuts first. Gps common mode time and frequency comparison.
skip and I are using sirf-4 gps receiver and sirfdemo software ver. 3.87
downloadable from the web.
the receiver is a
global sat (sirf-4) bu-353s4 mag mount usb gps receiver. ubtained from gps city
in las vegas. They have an online store.
My first bu353-s4 was purchased from ebay from someone in utah. It had bad
sensivity.
My holux gr-213 sirf III receiver which has the best sensitivity was from ebay
china 5 or 6 years ago.. It has the sbas satellites (old prn sbas sats)
hardcoded in firmware and will not receive any current sbas sats..
I believe the holux gr-213 sirf-3 mag mount usb gps are still sold. But must
certainly have the new sbas satellites hardcoded correctly ?
The holux gr-213 sirf-3 generated rfi so If your a hf ham radio operator you
might not want a sirf-3 holux gr-213 receiver.
Sincerly Tom.
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