[time-nuts] Need Time Help
wes at triconet.org
Thu Oct 6 14:10:33 EDT 2016
On 10/5/2016 7:40 PM, Chris Albertson wrote:
> There was a time when HAMs where the ones pushing radio technology
> forward. Maybe these guys are doing that and building a digital EME
> network on VHF? We don't know.
Actually, we do know. Regarding my earlier comments, I believe at the time
(mid-1970) those of us pursuing EME _were_ pushing the technology forward.
> We can guess but typically when you start wanting precise time
> synchronization it is because of something like TDMA (time division
> multiple access) to a shared resource.
Not so. What is now common is the use of "JT" modes. JT modes have a number of
variations but what they have in common is they were developed by Nobel Prize
winner, Dr. Joe Taylor, who has freely given the software to the ham radio
community. See: http://physics.princeton.edu/pulsar/K1JT/JT65.pdf
Although I personally ceased pursuing this activity many years ago, there remain
some of us, who are not Luddites, but still believe that "Deep Search Decoding"
is a questionable practice, no matter how it is rationalized.
Nevertheless, the referenced paper should explain the need for precise timekeeping.
> On Wed, Oct 5, 2016 at 9:47 AM, Wes <wes at triconet.org> wrote:
>> If you are working "real" EME where you, and not a computer plus lookup
>> table, are coping the signals, none of these precise timing issues exist.
>> Wes N7WS
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