VE2VM commented
But Isn't Cesium drift-free? Since the SI second is
standardized as de duration of 9192631770 oscillation
of the hyperfine transition of the atom 133Cs?
If Cesium drifts, theren should be a more formal
definition of the second (Such as density, maximum
C-field or level of puri
Christopher Hoover asked:
one issue remains: i have to crank the magnetic field setting almost to
its high limit (9.91/10.00) to get 5 MHz out; lower settings give a
frequency that is too low. i presume this is unusual.
i have a rudimentary understanding of the rubidium oscillator
John Ackermann took my name in vain:
> Hi Brooke --
>
> The circuit I use is stolen from Tom Clark's TAC -- paralleling
> several sections of a 74AC04 hex inverter through 47 ohm resistors.
> For the current TADD projects, I'm using three sections that way, so
> each chip gives me two outputs,
Chuck said
> I got the notion that it was turned off during Desert Storm,
> by virtue of being involved in the e-warfare effort that lead
> up to, and followed the event.
>
> I haven't been paying much attention since. I knew that they
> had intended to turn SA back on after production of the p-c
Don did not mention which basic receiver is inside his AUTEC box. Some
receivers do exhibit glitches. Some of these are documented in my 2000
ION paper Low-cost, High Accuracy GPS Timing available on
[1]http://gpstime.com. You might find some of the Timing for VLBI
tutorials to be o
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David and Tom opined:
Rain should have an effect on the timing of the signal, since the
propagation speed of radio waves through water is different from that
through air. It will also attenuate the signal, causing worse S/N
ratio which would cause the lower-eleva
I have done several GPSDOs using the NAVMAN receiver, so I add a few
comments to the discussion:
1. Both the G3RUH
([1]http://www.jrmiller.demon.co.uk/projects/ministd/frqstd.htm) and
I2PHD ([2]http://gpsdo.i2phd.com/) designs use 74HC390 divider chips;
I also tried them. What I
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