[time-nuts] Greetings from Australia

Bob Camp kb8tq at n1k.org
Mon Jun 29 16:57:06 EDT 2015


> On Jun 29, 2015, at 12:33 PM, Brek Martin <bmar8190 at bigpond.net.au> wrote:
> Hi Guys :)
> I thought I’d say thanks for the add to the group and introduce myself.
> I’m only starting to get compulsive about time and frequency.
> My findings so far are that only the timing of the next second matters because it’s too late
> to worry about the current second by the time you have the information about it.
> It’s +10 hours here so I have to add 10 to everything, and that could increment the date,
> so then a whole calendar program is required to know what the next date will be,
> just because you need to know what date it will be on the next seconds tick that occurs.
> I have a question…
> Is the reason most amateur radio people care about accurate frequency mostly about
> operating at higher radio frequencies?
> I imagine if a bunch of radio enthusiasts aligned their HF radios with atomic standards for use
> on those bands that doppler shift would ruin everything the additional hardware put into it.

Yes and no.

If the ionosphere is getting involved (or other forms of propagation) then yes you will get time
varying path length. The result will be a time varying phase modulation. Your frequency 
will always be correct. The signal “as received” will appear to be off frequency due to the 
phase shift caused by the path length continuously changing. 


> Cheers, Brek.
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