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At its simplest, for anywhere in the world this page calculates and displays on a map the direction bearing or azimuth to point align a terrestrial TV aerial towards a distant transmitter, and can display on an internet map the required azimuth bearing or direction , or calculate the compass or grid bearing for use with a printed map. However for countries in the British Isles including Eire, particularly for those within the UK , it can do significantly more.
To realise its full potential, first time users are advised to read the General Help. The options available also depend on the chosen receiver location as follows:. As accurately as possible, enter locations for the receiver and transmitter, click the map button, and if required drag the marker s to more precise locations. The map has two choices of base layer selectable by the buttons in the top right hand corner.
Satellite pictures can take significantly longer to load, so it's quickest to use Map to get as close as possible to the intended final location and zoom level before switching to Satellite. Satellite images are often subject to perspective distortion , occasionally to an extent significant in the context of aligning a TV aerial, thus making their results potentially less reliable than the initial impression given by their simplicity.
UK users can choose a transmitter via one of the various UK lists and the transmitter's location and height will be entered automatically. Users from Eire will need to determine and enter manually not just the transmitter's location but also the height of its antenna above sea level. If you are within range and have a clear Fresnel zone, then you should get a good signal, but obstructions will progressively weaken it, blocking it when they cross the line of sight.
If the signal is blocked, then you can only receive it indirectly, perhaps by reflection off other buildings or refraction over or around obstacles. In marginal cases, you might be advised to consult a reputable CAI installer with good local knowledge, or to consider Freesat.
If the relevant maps have been created, clicking in the top third of the display will centre the Google map on an area of the signal path, the bottom third the OS map, and the middle third both. Further details are given in UK Transmitter Help. Click the buttons beneath the navigator bar to swap between the two modes. If, despite the coordinate vetting, you manage to create a map of somewhere not actually covered, the map may just show nothing, or stick on an area on the north east coast, in which case Ctrl-Click the map button to remove it, and just use the Google one.
If you are unsure of the format for inputting data, hovering the pointer over an input will bring up a short message describing the format expected. UK Place Name look up covers UK mainland only, except that the transmitter version also searches the UK transmitter list.
UK Post Code look up should find codes for the entire UK, but to reduce the chances of usage capping by Google, does so by searching the OpenSpace UK mainland database first, only trying Google on failure. Other post codes and places, for example Eire, can be looked up using the World Place Name option, but the database is very US -centric, so append an appropriate country name, for example ,Eire.
When you are satisfied with your settings, you can save them by pressing Submit and then bookmarking, marking as a favourite, the resulting URL, the parameters in which will recreate your original settings in the calculator. You may wish to do this once you have positioned a map exactly on your aerial site as described above though then you will have to wait for everything to reload. Clicking on a map button fixes latitude and longitude as the method of designating the receiver location.
Dragging a marker to a new location updates the calculator and may also recentre the map s. Likewise, where necessary, changes in the calculator will be reflected in the map s. However, for performance reasons, I suspect that in such cases most professional installers would recommend the narrowest group aerial that can accommodate the signals required, and not a wideband.
UK transmitters are arranged in groups with main transmitters, here shown in bright white, covering general geographical areas, and relays sub-transmitters , here shown in off white, filling holes in the coverage of the main transmitters. Most main transmitters and some relays transmit all six main digital mux es, some of which also transmit further local muxes, but most relays only transmit the three PSB muxes.
Transmitter information is available here for the entire UK , including the CI , the IoM , and NI. Sources are primarily Ofcom, but also Digital UK, and the BBC , see the links at the bottom of the page. Note that I am aware of some data conflicts between sources, and while I have endeavoured in good faith to resolve these correctly, it's unlikely that I have succeeded in every case, and while I apologise in advance for any errors that may be here, I accept no responsibility for their consequences.
Before using this feature, it's recommended to open the Google Map and exactly position the receiver marker green. Thereafter, the marker can be adjusted up to 15m before terrain data will be refetched from the server. It's important to understand that the accuracy of such predictive calculations will be limited by the completeness with which many factors explained further in the General Introduction are taken into account.
The official Digital UK Postcode Checker has access to the best data, yet is considered 'pessimistic' because of the strictness of its correction for availability over time, and because the interpretation of its results on a per post code basis leads to post codes with mixed reception being marked out of coverage, even for individual addresses within them that may be within coverage.
By contrast, this one is probably too optimistic because, although it works from the actual location of the receiving aerial, it lacks transmitter radiation patterns and any correction for availability over time. Thus, although the predictions of either checker are a useful pointer, neither should be taken as fact, and wherever possible should be checked against other such information, preferably against actual measurement.
In particular, signal levels given here should be regarded as likely relative rather than absolute. Note that, during the search, the form and the markers on the map are locked, and occasionally and randomly, internet traffic or other problems may prevent completion and unlocking.
In this situation there are several means of escape:. Each transmitter broadcasts either 3, or 6 or more, digital muxes, each carrying many digital channels within the same spectrum space as formerly occupied by a single analogue channel.
Channels above 60 were released for 4G mobile data use during DSO, leaving 21 to 60 as the current range, but between and further channels above 50 MHz are to be released for mobile use. As with DSO, these ongoing changes will cause 'retune events' requiring local residents to retune equipment to pick up changes, some may even need new aerials. Homes can be provided with filters to be fitted to the aerial downlead, but some have doubted whether filters will really be able adequately to differentiate between the wanted TV signals and the unwanted mobile signals, as well as to what arrangements will be made to distribute these filters and whether and in what circumstances they will be chargeable to homeowners.
Useful links no endorsement of external sites intended nor responsibility taken for their content:. The options available also depend on the chosen receiver location as follows: If you plan to print either map, please read the Notes. Latitudes, longitudes, grid and magnetic variances can be entered as decimal degrees or DD: In both cases, southern and western values can be entered as negative or by appending S or W, northern and eastern as positive or by appending N or E.
All other data such as grid references and post codes should be entered in their normal format. Irish grid references should be flagged with a leading I. For example, that for Divis transmitter would be entered as IJ , although as it happens this transmitter is in the area of overlap between the two systems, so the nearest UK equivalent of NW will also work.
The following multiplexes muxes are currently being broadcast in the UK: Name Alternate Name s Operator Specifications Comment PSB1 BBC A, Mux 1 BBC DVB-T: For receiver locations within the UK, transmitters can be selected: Alphabetically from the entire UK List. Alphabetical list of transmitters broadcasting all of the six main digital muxes.
In distance order out to km, approximately 62 miles, default selection will be nearest main transmitter. In this situation there are several means of escape: A Cancel button is displayed whenever the calculator is locked; The search script has a timeout; Many browsers throw up a dialog box to allow breaking out of a script that has hung; A few older browsers may hog the CPU so much that cancellation has no effect, and then there will be no alternative to reloading the page, to aid which this option cannot be set via a URL parameter, it will be changed to the previous option on reload.
Additionally, UK Place Name can be used to search for a transmitter of which the exact name is uncertain. Any transmitters so found will be inserted at the top of the results denoted by Tx , and a dialog box will offer to select the first one found as the chosen transmitter.
When a transmitter is chosen from the results, UK National List and the chosen transmitter are set. Thereafter it will display in red, indicating the model's increasing unreliability over time, in which case you should attempt to get a more recent estimate for your location and enter it manually: NOAA's Geophysical Data Center - Magnetic Field Calculators British Geological Survey - World Magnetic Model Calculator Browser compatibility notes see also the next note about printing: If you create both types of map together without letting one complete before starting the other, or, after creating maps, many times change settings in the calculator or drag and zoom forcing continual redrawing, you may find that the Google map becomes blank, or there are jumbled tiles or holes in the OS map, or markers disappear from it, perhaps first from the print preview, then from the map proper.
Such problems may resolve themselves given enough time, but now there is also an option to remove a broken map or signal profile by Ctrl-Click ing the relevant button, so it can be then be clicked again to redraw from scratch. However, particularly as Google Maps do not document a destroy function, it is questionable whether all the resources used are reclaimed when a map is removed, and, especially if you want to print the maps, you may have to reload the page with your chosen final settings, most easily done by clicking Submit on them, before creating one map at a time, allowing each to load fully before creating the next.
Of the newer Webkit versions, only 43 has been specifically tested and shown to work, but Webkit browsers generally are known to work. Each map is designed to print on a single page of A4 or Letter with top and bottom margins of about 15mm and side margins of about 10mm. This site has better map printing support than many, but generally printing web content is too often neglected, not least by those who create browsers, and maps particularly so.
In the past I've reported problems to Microsoft, Opera, Google, and OpenLayers, yet problems remained long outstanding, though recent testing has shown a marked improvement in some browsers. The latter tend to look fine in Print Preview but prevent the map printing properly. Apologies for these inconveniences. Useful links no endorsement of external sites intended nor responsibility taken for their content: Other page in this series: Choosing A TV Satellite TV Terrestria l TV TV In The UK Many thanks to: Updated Google Maps authentication.
Added navigation history controls to Ordnance Survey map. Added support for legacy transmitter URL parameters where the NGR of the TX has since changed. Fixed bug in Transmitter Group selector, and another in Find Nearest selector. Bugfix to allow spaces in grid references. Improved form option locking when maps are drawn. Refinements to site OpenLayers script and SRTM void data handling. Improved date handling for DSO start and end days.
Updated URL parameter handling to be more memory efficient. Added knowledge of transmitters broadcasting all digital muxes. Fixed bug loading DMS values from URL. Released September's major upgrade betas as live. Cut down OpenLayers script and enabled compression for faster loading. Converted to use SRTM terrain and UMD clutter data. Significant rewrite of asynchronous script loading. June Fixed bugs: IE data file reading anomalies. Reading URL parameters when DMS set.
Improved scales on signal profile. Greatly improved support for IE8 wrt map drawing and printing. Updated site scripts for better form handling and asynchronous data loading.