Ham IP addresses?

Wed Jan 15 22:35:51 CST 2014

I was at UMCP as an undergrad from 1977-1981 and active in the W3EAX 
club on campus.  I was also somewhat active with the club for a few 
years afterwards while working as staff on campus for next next 10 years 
or so.

louie
wa3ymh

On 01/15/2014 06:05 PM, Alex Fraser wrote:
> Did you participate in the Ham Club on Campus?
>
> On 1/15/2014 12:28 AM, louie wrote:
>> There was a wormhole in the sky that I was involved with back around 
>> 1987.
>>
>> I was working at the University of Maryland Computer Science Center 
>> in College Park at the time, on the staff at the computer center 
>> there.  We had a couple of satellite antennas on the roof that we 
>> used for various purposes.  One of them was otherwise "idle" as the 
>> project in question has come to a merciful end.
>>
>> Now this satellite dish and feed, etc. were still up on the roof. It 
>> was a pretty good size, maybe around 3 or 4 meters?  It was 
>> relatively expensive and painful to get installed, both because of 
>> the weight of the structure, as well as needing to run conduits for 
>> the signal runs as well as non-trivial power to run heaters for the 
>> feed and dish so that the link would continue to operate during snow 
>> storms.  While there was money to install it, there was no obvious 
>> money at hand to remove it, and I think we were all hoping to 
>> leverage it as part of some future project or grant..
>>
>> There was a ham at the company that ran the actualy satellite 
>> operations for this link.  I wish I can recall who it was at Vitalink 
>> in the SF bar area, but I can't at this point.  We managed to hook up 
>> somehow, and he had the idea to set up an AX.25 packet radio 
>> wormhole.  It was done in a fairly interesting way, at least given 
>> what was available at the time. He shipped out some hardware that 
>> produced the ability to transmit audio over the data link.  I think 
>> the capacity of the full-duplex data circuit was 19.2-50 kb/s; and he 
>> had some hardware with a (as I recall) CVSD audio code.  We installed 
>> a 2m antenna on the roof of the building in a quasi-official manner 
>> and scraped up 2m radio and TNC.   Likewise, a similar configuration 
>> at the far end.  We ended up sending audio from each end to the other 
>> with the effect of having this crazy digipeater.  It suffered a bit 
>> from a hidden terminal problem, since local transmitters on 2m in the 
>> MD/DC end couldn't hear the audio being received from california, and 
>> vice-versa.  But it worked after a fashion.
>>
>> It was up and running for some number of months, maybe a year or so, 
>> using WA3YMH-1 (or some other suffix) as the callsign of the 
>> digipeater.  I'm sure it was all perfectly legal, and I'm pretty 
>> hopeful any statute of limitations has since expired, if not :-)
>>
>> There's an article here: 
>> http://ncpa.n0ary.org/13_Downlink_1994_summer.pdf starting about page 
>> 13, describing that experiment, including the later conversion of the 
>> audio bridging to using the link between two NET/ROM nodes, one at 
>> each end.  As I recall, we just shoved the 9600 bgp async serial data 
>> into the 56k synchronous satellite modems and there were enough 
>> samples per bit to get the async characters shoved over to the other 
>> end!
>>
>> I also recall random flame wars at the time about the impurity of 
>> tunneling amateur packet radio over non-amateur radio facilities, 
>> because, you know, that's just wrong.  Like phone patches are all 
>> different.  Like we do with many ARISS contacts these days.  Oh well.
>>
>> I don't know if any AMPR IP traffic ever got shoved over this. Around 
>> the same time, early KA9Q NET or NOS code has the ability to tunnel 
>> over the Internet, so maybe that was going on at the same time?
>>
>> louie
>> wa3ymh
>>
>>
>> On 01/13/2014 01:25 PM, Mike O'Dell wrote:
>>> i admit to tossing a softball at RS
>>> to elicit his response. (grin)
>>> it is a very concise summary of messiness
>>> which others have spent many pages failing
>>> to explain.
>>>
>>> Louie can probably fill in details (or correct
>>> blatant errors), but I believe Net 44 came about
>>> when Mills did The Great Wormhole
>>> In The Sky experiment. and it's easy to believe
>>> Kantor was complicit. Dave Mills was historically
>>> prolific in gluing "novel" infrastructure onto
>>> the experimental IP/TCP network to prove by
>>> demonstration what could be achieved. This
>>> was the genesis of the IP-enabled FAX machines
>>> and the link between the DC area and the San Diego
>>> area over satellite that also carried net-44 traffic
>>> for a while.
>>>
>>> And with that, my personal Wayback Machine is geezed-out.
>>>
>>>      -mo
>>>
>>> _______________________________________________
>>> Tacos mailing list
>>> Tacos at amrad.org
>>> https://amrad.org/mailman/listinfo/tacos
>>
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>
>
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>   ~~~********************Alex Fraser********************~~~
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