Displaying 2 results from an estimated 2 matches for "60khz".
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60hz
2017 May 24
2
System Time Source
On Wed, May 24, 2017 10:45 am, Warren Young wrote:
> On May 24, 2017, at 8:52 AM, Chris Adams <linux at cmadams.net> wrote:
>>
>> Once upon a time, Warren Young <warren at etr-usa.com> said:
>>> a. It???s transmitting from a fixed location in a time zone you
>>> probably aren???t in ??? US Mountain ??? being the least populous of
>>> the lower
2017 May 25
0
System Time Source
...ropagation for ground based HF vs ground effect
> only at the receiption point, but much higher for much higher frequencies
> of GPS; pre-amplifier Signal to Noise ratio (S/N; which can technically be
> achieved to be much better at much higher GPS frequencies...).
WWVB's signal is at 60kHz, which is LF, not HF. LF signals are not
significantly attenuated by ground conductivity effects, so a simple
inverse-square-law free-space path loss calculation is a close
approximation; the loss to a point halfway around the world (~20,000 km)
is about 94dB (82dB for 5,000km); the ERP is 70kW...