Talk:Tropospheric propagation

Marked as duplicate / proposed merge
I have marked this as a duplicate/proposed merge of Tropospheric scatter article. It is my belief that these two articles describe different applications of the same propagation mode and are small enough to practically merge as one article. Discuss here.Defrector (talk) 11:06, 21 July 2013 (UTC)

DX?
DX needs defining or linking to where it is defined. 90.212.251.246 (talk) 20:19, 24 January 2010 (UTC)
 * Linked on section header to main article about DXing. --milonica (talk) 22:30, 24 January 2010 (UTC)

This article also doesn't say how the EM waves actually reflect off the troposphere. What is the EM energy inteacting with to cause the reflection. A little bit of physics goes a long way. -anon —Preceding unsigned comment added by 131.137.245.208 (talk) 20:02, 16 June 2010 (UTC)


 * there was no link on the section header to the article about DXing. if there was one, someone deleted it.  i put it back in.  i also added a one sentence explanation of DXing at the top of the section.Colbey84 (talk) 02:46, 13 November 2016 (UTC)

Notable tropospheric DX receptions
Several entries have no citations. I've tagged them, and will soon delete any which remain unsourced.  Will Beback   talk    01:32, 7 December 2011 (UTC)
 * Going twice.   Will Beback    talk    07:08, 27 December 2011 (UTC)
 * I second the deletion of unreferenced entries. -- ḾỊḼʘɴίcả  •  Talk  •  I DX for fun!  07:38, 27 December 2011 (UTC)
 * Seeing no other comments, I've moved the unsourced entries here. Any entry can be restored with sources, if found.   Will Beback    talk    07:30, 3 January 2012 (UTC)


 * During October 1975, several United Kingdom DXers received band III and UHF television signals from Finland, Poland, Czechoslovakia, and the USSR at a distance of over 1000 mi.
 * On December 3, 1975, Robert Copeman, Sydney, Australia, received Auckland, New Zealand, TV-2 NZch4 band III TV at a great-circle distance of 1340 mi.
 * From 1989 to 1994, FM stations and TV VHF/UHF stations from Florida, and even from Alabama, USA were received in Havana and other parts of Cuba. VHF low band channels from Puerto Rico, Dominican Republic and Mexico were also received during summer afternoons.
 * On June 26, 2009, a weak signal from WOI (Iowa Public Radio) FM 90.1 in Des Moines was received on a portable radio in the Merrymount section of Melvin Village, New Hampshire, at a distance of approximately 1,140 miles, and on June 30, 2009, a strong signal from WMBI (Moody Bible Institute) FM 90.1 in Chicago was received clearly on a car radio in East Moultonborough and Melvin Village, New Hampshire, at a distance of approximately 839 miles.
 * On August 28, 2009 Romanian dxer "Zvartoshu" received FM ERTU Moskee, 93,1MHz via tropo multihop in Bucharest in Piata Unirii central zone, at a distance 1688 km.
 * On the afternoon of June 25, 2011, a DX'er and Radio Engineer, Bob Gilmore, received WMIX 94.1 from Illinois in Southern Connecticut.
 * During the late night hours of July 19, 2011, Amateur DXer Chris Barrows received DTV station WNTZ-TV from Natchez, Mississippi in Decatur, Texas, a distance of up to 385 miles.

Additional unsourced notable reception
Any objections to removing this seemingly impossible reception? Unless I see a source, I have a very hard time believing such a thing was possible
 * On October 3 2012, an American Ham Radio operator N3MPE was heard over a UHF CB emergency repeater located 40km north of Brisbane, Australia -- ḾỊḼʘɴίcả  •  Talk  •  I DX for fun!  03:40, 23 October 2012 (UTC)

Questionable grammar?
This part of the article "while with tropospheric-bending, stable signals with good signal strength from 500+ miles (800+ km) away are not common when the HA JA JA index of the atmosphere is fairly high." doesn't seem right... I suspect its supposed to read "are not uncommon when" ... ?? — Preceding unsigned comment added by 24.156.205.173 (talk) 07:32, 5 September 2013 (UTC)


 * exactly why i came here. it seems that it should be "not UNcommon".  i'm very tempted to change it, especially since the previous question about it has gone unanswered for over 3 years.  however, the "...WHILE with tropospheric-bending" makes me hesitate.  that phrasing would normally indicate a DIFFERENCE from the first part of the sentence, (which discussed tropo-ducting).  with no further discussion about tropo-bending, i find it difficult to understand the difference.
 * i get that tropo-bending is a form of tropo-propagation (where "running into" a "wall" of warmer air causes the signal to "bend" around the globe rather than continuing in a straight line). is it that tropo-ducting is a form of tropo-propagation, and tropo-bending is a form of tropo-ducting??
 * if that's correct, the sentence is still confusing. with the "WHILE," maybe it should be referring to different frequencies??  meaning, the 1st part of the sentence is about UHF signals being picked up 800 miles away, and the 2nd half is about VHF signals being picked up 500 miles away??
 * and, if THAT'S correct, it should STILL be "UNcommon."Colbey84 (talk) 02:15, 13 November 2016 (UTC)
 * I think the phrase "dielectric mirror" should be mentioned more often and also "total reflection", and also, how a hot road surface or even desert can cause mirage and fata morgana, because it is the same effect only at a different wavelength. I believe those terms have their own extensive wikipedia entries, so link them.

15th June 2018 BBC R4 Sandale/
About 5 to 10 minutes before 19:00 CET, the "BBC R4" interfered with the reception of an FM station on my radio at 92.6MHz... it took 5-10 minutes to establish a very strong interference, to the point when I could tune the frequency right at 92.5MHz and get stereo reception. There was a time signal and news or something on the programme, so I guess that was at exactly 19:00 local time. (18:00 in the UK, I guess). By 19:50 the interference was gone...

By a coincidence, at the time the interference started, there was a start of wind gusts...

https://en.wikipedia.org/wiki/Sandale_transmitting_station https://en.wikipedia.org/wiki/North_Hessary_Tor_transmitting_station

Both transmit BBC R4 at 92.5MHz, and my car with stock car radio, where only antenna was replaced with a larger one (30cm), I got reception with clear stereo signal, on the point that it caused heavy interference with a near 92.6MHz station, and later completely obliterating it.

I measured that the standing car was at equal distance from both stations of ~1530km, so there are possibly also beamforming effects other than the tropospheric ducting.

The Honda Civic VII was made in the UK, btw, does it count as a DX equipment? This isn't the first interference noticed, but I estimate that the equidistant position of both transmit stations and the sun position on the west may play a large role in the effect. In the past I was getting BBC interference in the evening, night, while travelling around Brno, also along the axis of equidistant station position, but back then I assumed that the station must have been transmitting from Austria. — Preceding unsigned comment added by 90.64.43.195 (talk) 09:50, 16 June 2018 (UTC)