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Years ago I sketched out a protocol for differential pulse position
modulation to send telemetry via a xenon strobe. I never got around
to testing what kind of timing accuracy I could get out of it. I
thought the scheme was kind of clever, and then I realized that
Aeneas of Stymphalus had described an optical pulse position
communication system around 350 BC.<br>
<br>
Scott<br>
N1VG<br>
<br>
<div class="moz-cite-prefix">On 1/24/2017 10:45 AM, Stephen H. Smith
wrote:<br>
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<div class="moz-cite-prefix">On 1/24/2017 12:50 PM, Robert
Bruninga wrote:<br>
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<p class="MsoNormal">CONVERSLY BACK EAST we have never found
any east-coast OT scout operations. Maybe the les reliable
sun and the tree covered mountains make long distance
optical comms too difficult. But if the HAMS on the Golden
Packet carried along a bright car headlamp, I bet we could
send flashing light to scouts out to 50 mile east coast
ranges.</p>
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<p class="MsoNormal">Bob, Wb4APR</p>
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<br>
Forget about car headlamps and clumsy exteernal batteries! One
of these high-power LED flashlights would do the job. This
heavy-duty aluminum-and-rubber-barreled device runs on 3 "C"
batteries, and has a push-pull zoom head with an actual curved
lens in it. (i.e. not just moving the reflector as many zoomable
flashlights do.) It can zoom the 700 lumen LED beam from a very
broad (approx 90-degrees) diffuse spread down to a spot beam of
less than 10 degrees. <br>
<br>
Pack of two of these Duracell flashlights (including 6 C-size
Duracells!) is $16 at Costco.<br>
<br>
[Not sure if the inserted image below will make it through the
TAPR remailer]<br>
<br>
<img src="cid:part1.106EB4FC.9A83AC47@opentrac.org" alt=""><br>
_____________________________________________________________<br>
<br>
<br>
Stephen H. Smith wa8lmf (at) aol.com <br>
Skype: WA8LMF<br>
EchoLink: Node # 14400 [Think bottom of the 2-meter band]<br>
Home Page: <a moz-do-not-send="true"
class="moz-txt-link-freetext" href="http://wa8lmf.net">http://wa8lmf.net</a><br>
<br>
_______ Windows 10 Outrages! _______<br>
<a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="http://WA8LMF.net/Windows10_Info"><http://WA8LMF.net/Windows10_Info></a><br>
<br>
Live Off-The-Air APRS Activity Maps<br>
<a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="http://wa8lmf.net/map"><http://wa8lmf.net/map></a><br>
<br>
Long-Range APRS on 30 Meters HF <br>
<a moz-do-not-send="true" class="moz-txt-link-rfc2396E"
href="http://wa8lmf.net/aprs/HF_APRS_Notes.htm"><http://wa8lmf.net/aprs/HF_APRS_Notes.htm></a><br>
<br>
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<pre wrap="">_______________________________________________
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