Well some progress actually made. Ripped the oscillator out of the assembly
and removed the rest of the material surrounding everything. Now have a
schematic at least 90% correct. Part of the issue seems to be rotting
solder joints. After fixing those the unit appears to be on frequency at 5
MHz
Thanks for the link, Bob. I got to know both Victor Zhang and Mike
Lombardi during my
stay at Arecibo, but to my regret have never met either in person.
Dana
On Sat, Feb 27, 2021 at 6:01 PM Bob kb8tq wrote:
> Hi
>
>
>
> > On Feb 27, 2021, at 11:18 AM, Dana Whitlow
> wrote:
> >
> > Thanks,
Hi
> On Feb 27, 2021, at 11:18 AM, Dana Whitlow wrote:
>
> Thanks, Bob.
>
> It seems to me that, depending on the positions of sats visible to one's GPS
> antenna and the spatial distribution of free electron density in the
> ionosphere,
> the ionospheric contribution to position errors
k8yumdoo...@gmail.com said:
> During my Arecibo Observatory days we used NIST's TMAS service to keep our
> H-maser-based station clock synced with UTC. Our user community (mainly VLBI
> and pulsar timing people) seemed pretty satisfied with +/- 100ns accuracy, so
> I tried to do better by
Dana,
> During my Arecibo Observatory days we used NIST's TMAS service to keep
> our H-maser-based station clock synced with UTC.
And before that, the observatory used Tom Clark's Oncore & SHOWTIME and
later Rick Hambly's CNS clock & Tac32Plus, yes?
Rick continues to develop the CNS clock,
Hi,
On 2021-02-27 17:18, Dana Whitlow wrote:
> Thanks, Bob.
>
> It seems to me that, depending on the positions of sats visible to one's GPS
> antenna and the spatial distribution of free electron density in the
> ionosphere,
> the ionospheric contribution to position errors could sometimes
On 2/27/21 8:18 AM, Dana Whitlow wrote:
Thanks, Bob.
It seems to me that, depending on the positions of sats visible to one's GPS
antenna and the spatial distribution of free electron density in the
ionosphere,
the ionospheric contribution to position errors could sometimes largely
cancel.
But
I have just got myself one of these from EBay , and it was from good home , and
well cared for , but So far I cannot find any manuals , or data on the web. It
‘proclaims ‘ NO FAULT after going through the menu’s . I am not having any luck
with operating changes to the parameters - could this
Thanks, Bob.
It seems to me that, depending on the positions of sats visible to one's GPS
antenna and the spatial distribution of free electron density in the
ionosphere,
the ionospheric contribution to position errors could sometimes largely
cancel.
But that observation may (or may not) reflect
Hi
> On Feb 27, 2021, at 9:41 AM, Dana Whitlow wrote:
>
> I've long understood that ionospheric delays and variations thereof lead to
> *position*
> uncertainties in GPS navigation receivers, to the tune of perhaps 10m
> (2DRMS IIRC).,
> and that these are said to constitute the single
I've long understood that ionospheric delays and variations thereof lead to
*position*
uncertainties in GPS navigation receivers, to the tune of perhaps 10m
(2DRMS IIRC).,
and that these are said to constitute the single largest GPS error source.
Q1: Would this not imply timing errors of
Hi
The same 20 or so ns delay in a saw would also apply to the
saw (or tight filter) in some timing antennas. It also would apply
to the saw(s) in some modules. Even if the tolerance is “only”
a couple ns on each of them, you *could* have 3 or more in the
chain.
Lots of numbers to crunch to get
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