On 9/11/25 08:33, William Morder via tde-users wrote:
On Wednesday 10 September 2025 22:11:16 gene heskett via tde-users wrote:
On 9/10/25 23:12, William Morder via tde-users wrote:
On Wednesday 10 September 2025 18:47:24 dep via tde-users wrote:
A long day and night with Commodore OS, in case anyone's interested.
Maybe somebody else out there who knows more about these things
(thinking of you, Gene!) might be able to tell me why this cannot
possibly work.
Bill
Yes it /could/ work, Bill, but introducing the noisy world of broadcast
does entail an attention to detail involving frequency accuracy and some
sort of an error correcting algorithm where sufficient redundancy exits
in the code format to make self correcting code practical. Fire coding
comes to mind, but even that requires sufficient redundancy to fix multi
bit errors created by a leaky crossbar on a power pole. A pole
originally equipt with 2400 volt rated glass insulators, up-graded to
carry 7200 volts w/o replacing the insulators, compounded by the
diagonal steel braces holding the crossbar level but with the center
bolt into the pole not having been re torqued since it was originally
bolted up in 2400 volt REA days. There does not exist in this scenario,
a method to demand a re-transmission of corrupted data. All the common
methods today, rzsz, tcp, probably a dozen other's, all work because its
a 2 way path. Corruption detection is easily done with a crc on each
sectors (256/512) worth of data, but w/o the on demand retransmission,
is hellishly difficult. Yes, that case IS 2 way. But the speed of light
time delay doesn't make it easily done. Our voyager satellites are
delivering only femtowatts of signal at goldstone, so I expect half of
the available bandwidth is devoted to error detection & correction. At
that power level, I'd be amazed if they are functioning at over 1 bit
per second. Their plutonium thermally generated power is nearing the
end, and it will take electronic magic to get data from them in another
decade. And one hell of a budget item for boiling helium to maintain the
half degree kelvin the electronics at the focal point of the goldstone
dishes need to be able to hear the voyagers in the face of that half
degree of thermal noise. It's all we got in this case.
Cheers, Gene Heskett, CET.
I knew you would be able to give me the long answer with technical details
about radio's limitations. I will have to read this again later, when I am
more awake. (This email is one of those "woke up in the middle of the night"
replies.)
Also, as I said, I have a shortwave receiver, and the idea of transmitting
data over shortwave is what got my attention. If shortwave, why not other
parts of the spectrum? Why not radio itself?
Anyway, I will have to look into this a bit more. As I said in another reply
to Andrew, just a few minutes before, I conceive of this as a kind of backup
plan for internet access, in emergency situations, for example, or when one
finds onself in a remote place without the usual ways of connecting; just to
be able to send and receive emails or text, or to use a text-only browser,
could be a lifesaver in extreme circumstances.
In those circumstances, Bill with the chaos that goes with it, will you
have electricity to run your computer? I might if nat gas is still
flowing as I had a 20kw standby installed to run the wifes oxygen
machine decades ago. And I have other facility's to protect the
homestead by permanently removing the threat with the triple S
protocol. Under those chaotic conditions, each of us will be the
undisputed king of our own little piece of dirt. My piece of dirt (usin
the term dirt loosely, it only grows weeds despite 20 lbs of good grass
seed) was paid for 27 years ago, not much but it is mine as long as I
pay the taxes. I'll be 91 in about 3 weeks, what can they do to me that
time has not already done?
Bill
Take care of #1 Bill. In the end, no one else will.
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Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
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