Talk:Longwave

message: That wasn't the best wording on my part, sorry! User:Pegasus33  —Preceding undated comment added 04:26, 28 November 2009 (UTC)
thread_title: Royal Navy Subs

message: ...monitoring 198 kHz. This claim, I think, needs qualifying with an "allegedly" or two. See The Today programme. Don't know -- seems to me like an adroit terrorist group could provoke a nuclear holocaust simply by taking out Droitwich (or Daventry?). –Hajor 20:41, 18 May 2004 (UTC)
replies: text: I am also sceptical of the usefulness of this approach during peacetime, because subs have two-way VLF radio communication. In a crisis, when subs need to maintain complete radio silence, the British authorities could set up military exclusion zones around the three transmitters (Droitwich, Burghead and Westerglen) and such an approach might be more likely. (I suspect Burghead and Westerglen would be switched off in such a situation - subs probably have better receivers than the average Scottish household!). Rugxulo 22:11, 19 January 2006 (UTC)
thread_title: Royal Navy subs

message: I don't know that Industry Canada has allowed "LowFER" in Canada - can anyone find a cite for this? I'll have to check the IC Web site, maybe it's there...--Wtshymanski 13:32, 3 Jun 2005 (UTC)
thread_title: Canada

message: I seem to recall reading an old issue of Practical Wireless from the 1970s which listed long wave broadcasts from Central Asia that were well into the 300's of kHz. Did these broadcasts exist? If anyone has firm information it would be an interesting addition to the article. Rugxulo 22:11, 19 January 2006 (UTC)
thread_title: Defunct long wave broadcasts?

message: I've attempted to clarify the relationship between this article, and the LF and MF articles. The situation is still not very good, however; for example, information on longwave amateur bands is in LF, whereas information on LF commercial stations is in longwave.  Some kind of merger seems to be in order, but I don't know the best way to handle that, given that the bands don't exactly match. — Johan the Ghost seance 10:25, 11 May 2006 (UTC)
replies: text: Now general information about LF (30-300 kHz) is in Low frequency and information specifically about LF broadcasting is in Longwave. Sv1xv (talk) 18:46, 1 March 2008 (UTC)
thread_title: Relation to [[LF]] and [[MF]] articles

message: This article claims that RTÉ off Clarkestown decreases its power at night. Now, as far as I can tell and remember (I live fairly close to the mast), in its Atlantic 252 days, Clarkestown operated 100kW daytime and 500kW nighttime. The station engineer I talked to also said the Radio Algeria transmitter went off-air over night. Obviously, even at the suggested power here, I'm not gonna be able to check the Radio Algeria transmissions without some very, very impressive sheilding :p There were reports back in the early 1990s of it being received in Brazil at night, which would suggest it had a clear channel.
Also, I've since been told that RTÉ now operate it at max. 300kW for simple cost saving reasons - they don't need a music quality signal across the entire UK; however would have thought that its still 100 day, 300 night. The site can actually operate at 600 but has no ITU clearance for such. --Kiand 03:12, 27 June 2006 (UTC)
thread_title: Clarkestown at night

message: I've heard numerous AM stations simulcast in the LW band inside the US. This seems to contradict the claim that there is no LW broadcast band.
: A very late reply to that August 2007 comment but please amplify. It's possible what you're hearing is an image of a normal AM broadcast band transmitter; if you notice a consistent pattern where local AM transmitters show up 455 kHz lower on your LF receiver, I suspect this is the case. Other, more complex sources of images can occur especially if two or more transmitters produce a difference frequency in the LF band - but then you'd hear both of them interfering. A good check on this is to put a low-pass filter between the antenna and receiver; even a few extra dB of rejection of the AM broadcast band may make the images go away. --Wtshymanski (talk) 18:55, 1 March 2008 (UTC)
replies: text:  Please don't delete other people's comments, just add your own. Thank you. Sv1xv (talk) 20:16, 1 March 2008 (UTC)
thread_title: Longwave simulcasts in the US

message: Article says: Instead, the D-layer of the ionosphere and the surface of the earth serve as a waveguide directing the signal[citation needed].
The following page describes in verbal and graphic way how the ionosphere and the earth's surface act as waveguides for longwave transmissions. 
http://www.weather.nps.navy.mil/~psguest/EMEO_online/module2/module_2_6.html
I am not sure if it's valid as a citation hence adding it here. I searched elsewhere with little success as how the ionosphere affects longwave radiation.
See also http://books.google.com/books?id=Xo5VxMTCz2UC&pg=PA1621&lpg=PA1621&dq=longwave+radio+ionosphere&source=web&ots=mociqIWSYk&sig=UVhWokRUm0OS5fzoSc9mFSmARaY&hl=en
193.120.148.177 (talk) 20:47, 21 March 2008 (UTC)
thread_title: Band Propagation

message: This article needs information on the purpose of long wave radio, e.g. why it is preferred over MW, why it should be used when long antenna setups are required, etc. -Rolypolyman (talk) 02:22, 2 October 2008 (UTC)
replies: text: As far as I know the main reason why longwave radio was introduced for commercial radio is that the medium wave band was overcrowded before FM radio became common. It also has a longer daytime range than MW. For military applications longwave radio also has other advantages, e.g. that it goes deeper into water, which is useful for communication with submarines. Also the waves are mostly propagated through the ground and not through the air, so it can be used to communicate with underground bases. --MrBurns (talk) 22:32, 13 September 2018 (UTC)
thread_title: Purpose

message: I added a photo of an old-style radio dial purely as art. Someone has added a caption which I feel takes the image too literally and is inappropriate. I propose to revert it. Comments? --Harumphy (talk) 19:13, 17 May 2009 (UTC)
replies: text: No comments received, so I've done it. --Harumphy (talk) 18:03, 19 May 2009 (UTC)
thread_title: Photo caption

message: Please expand this list and add coordinates of transmission sites.  —Preceding unsigned comment added by 91.46.217.2 (talk) 14:51, 15 January 2010 (UTC)
replies: text: This table requires notes at the bottom explaining what the headers are about. I refer specifically to the header for antennas, are they the transmitting antennas or recommended receiving antennas?1archie99 (talk) 00:45, 11 December 2012 (UTC)
thread_title: List of longwave transmitters

message: Was there ever a longwave broadcasting transmitter in Yafran or elsewhere in Libya?  — Preceding unsigned comment added by 91.46.158.98 (talk) 17:34, 11 September 2012 (UTC)
thread_title: Yafran

message: As a teenager in America, back in the 1960's, I wondered why with all its advantages there were no civilian broadcast on long-wave in the US and, as far as my research went, never had been.  I remember reading that the big disadvantage of long-wave was that lightning almost anywhere on the globe caused static and since there are thunderstorms around the equator at pretty much any moment it was not suitable for broadcasting music (this was long before the days of talk radio). I  had a multi-band receiver and I remember scanning the long-wave frequencies on a number of occasions and always picking up lighting type static even when I got none on medium wave (550-1600kHz). Could someone with more expertise address this and any other disadvantages to long-wave?
: Long wave, because of the long wavelength, needs impractically large antennas to broadcast with any reasonable efficiency. The tallest ever man-made structure before the Burj Khalifa was a longwave transmitter: Warsaw radio mast. Its ground wave range is also relatively long compared to medium wave, which means that the transmissions will reach out over a much wider area (1000 km is not unusual). That may sound like an advantage, but at such low frequencies, bandwidth is at a premium, so the longwave band has to be rather small (it's just over 100 kHz wide in Europe). Combine those two effects, and and what happens is that a single medium-powered transmitter will swamp a very large area, making that frequency unusable to anyone else, and taking away almost 10% of the available frequency space within that wide area. So the longwave band is good purely from a transmission effectiveness point of view (if you ignore lightning interference) but it doesn't work too well on a economical/commercial level. This is one of the reasons the FM band was moved from 50 MHz to its modern place after WW2: the higher frequencies are much more strongly localised to one area, so there is room for a lot more stations in a given space and stations can cater more easily to smaller, local audiences, which keeps costs down and attracts more people. A longwave transmitter for a single large city is silly, but for VHF it works. I think that in a way, paradoxically, what helped longwave survive in Europe is that almost nobody wanted to use it, and radio was always much more strongly regulated historically (generally only state broadcasters could get licences). So there was little competition for frequency space, and that probably kept it viable. CodeCat (talk) 22:25, 17 July 2013 (UTC)
thread_title: Disadvantages to Long-wave[[User:Dadadaddyo|Dadadaddyo]] ([[User talk:Dadadaddyo|talk]]) 21:06, 17 July 2013 (UTC)

message: 'In January 2014 Russia announced the imminent closure of most of its LW broadcasting stations'. – It happened on 9 January 2014 at '1 a.m.' (Moscow? time) according to the updated URL quoted at Note 8. Apparently one remains in service.  — Preceding unsigned comment added by 2.25.168.232 (talk) 19:37, 12 January 2014 (UTC)
thread_title: Cessation of most Russian longwave transmissions

message: The usage of  is under discussion, see talk:Outgoing longwave radiation --  65.94.169.222 (talk) 08:30, 3 August 2014 (UTC)
thread_title: {{no redirect|longwave radiation}}

message: I'm really not sure what most of this means. Does this "French language station Europe #1 in Germany" currently space its frequencies by something other than 9 kHz? What's the significance of "only 7 years ago"? No sources are linked to explain any of this. 108.171.128.174 (talk) 09:52, 22 December 2016 (UTC)
replies: text: It means that this French-language station is not at a multiple of 9 kHz. CodeCat (talk) 14:48, 22 December 2016 (UTC)
thread_title:  Carrier Frequencies 

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thread_title:  External links modified 

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thread_title:  External links modified (January 2018) 

message: A discussion is taking place to address the redirect :177 AM. The discussion will occur at Wikipedia:Redirects for discussion/Log/2021 September 23#177 AM until a consensus is reached, and readers of this page are welcome to contribute to the discussion.  ~~~~User:1234qwer1234qwer4 (talk) 19:41, 23 September 2021 (UTC)
thread_title:  "177 AM" listed at [[Wikipedia:Redirects for discussion|Redirects for discussion]]