Hepburn's New Automated DTV Log System in Grimsby, ON - Page 2 - Canadian TV, Computing and Home Theatre Forums

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post #16 of 22 (permalink) Old 2012-09-10, 08:14 PM
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2012-07-24 1931 5 2.1 KCWX-HD TX FREDERICKSBURG
2012-07-24 1931 5 2.2 KCWX-SD TX FREDERICKSBURG
Close to 2200 Km. wow.
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post #17 of 22 (permalink) Old 2012-09-10, 09:19 PM
 
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I'm no expert about this whole "pulling channels in from far away" thing, but I took a peek at this guy's page, and he's pulled in channels from Colombia, Venezuela and Panama. That is damn impressive.
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post #18 of 22 (permalink) Old 2012-09-10, 09:44 PM
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These extreme distant catches are all tropo event catches only. It would be near impossible to reliably catch anything that is well beyond the curvature of the earth's surface. Those distant signals come to his antenna by chance of extreme signal bounce/ducting/propogation.

His setup continuously scans for signals 24/7/365. Chances are that you've recieved similar distant signals but just didn't notice unless you just happen to scan at that particular split-second moment.

In theory,.. the question is in which direction did that distant 2200 Km signal come from. The 2200km distance would be the short and direct route. If it came the long route around the earth's 40,008 km,.. it may have travelled 37,808km...

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post #19 of 22 (permalink) Old 2012-09-10, 10:28 PM
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keep in mind, the longest paths are usually from ch 2 thru 6, because it's such a lower frequency, behaves more like HF (2-30 MHz) does under certain conditions, ie - HF skip in the ionosphere occurs daily. When there are Sporadic E events (not a daily occurrence), the MUF for skip rises significantly above HF, sometimes in to the low band VHF TV range. This occurs in the lower part of the ionosphere, referred to as the E - layer, thus the term Sporadic E. It's not the same as tropo.

DB8E/VHF Yagi rotor FM Bandstop ap-8700 preamp 8way split LG lcd.
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post #20 of 22 (permalink) Old 2012-09-10, 11:21 PM
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I agree it would most likely be 'Sporadic E propagation' [aka: Es,.. E-skip]. KCWX 2.1 is VHF channel 5RF [76-82Mhz] from Austin Texas 24kw.

This example of 1,340-mile (2,160 km) tropospheric ducting reception shows Auckland, New Zealand 175.25 MHz ch4 TV received by Robert Copeman, Sydney, Australia.
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New Zealand TV-4 channel 4 (175.25 MHz) video received on December 3rd, 1975 by Robert Copeman, Sydney, Australia. The propagation mode was summer time trans-Tasman tropospheric ducting. The distance is 1,340 miles from Auckland to Sydney.
http://en.wikipedia.org/wiki/File:TV...tropo-1975.jpg
Even though the reports indicated tropo ducting,.. being that it is below 250Mhz it is just as likely due to E-skip propogation.

I don't know why this is being listed in 'OTA Station & Network Operational Status'?

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post #21 of 22 (permalink) Old 2012-09-11, 09:40 AM
 
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Wow! From Burlington VT, to Montreal, Toronto all the way to Memphis TN. What a coverage.

I once toted the Grove vertical yagi in the mid-90s along with its famous bandpass filter housed in a paper cylinder (Made in the USA!!!) , for scanning purposes. Makes me want to get another one!

Going nowhere @ 220 ft
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post #22 of 22 (permalink) Old 2013-12-10, 07:53 PM
 
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This guy is awesome!!
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