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All posts by Mark Fletcher

Below are all of Mark Fletcher's postings, with the most recent are at the bottom of the page.


Dave Lindsay.The inversion effect can also occur during daylight hours as well as nightime hours,and can also happen anytime within all four seasons of the year,Spring,Summer,Autumn,Winter.It mostly occurs during anti-cyclonic conditions or high pressure sometimes between high and low pressure,rarely during low pressure weather or cyclonic conditions.It can also occur when it's damp,misty and more so foggy,not just warm/hot sunny weather even when it's freezing/cold sunny weather too and also in winter clear frosty freezing cold nights can create an inversion effect more so within a winter high pressure weather system.

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Jon.Norwich.Hard to say without a full postcode.Inversion effect could be the cause,are you receiving far away or foreign transmissions as such while you specified your signals pixellates,breaking up and disappearing altogether into "No signal" mode,when you retune.

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Belmont (Lincolnshire, England) Full Freeview transmitter
Wednesday 16 November 2011 12:54AM
Halifax

Dave Lindsay.In reply to the three questions you asked me in yer earlier post yesterday (Tue 15 Nov 2011,10:54am),the answer to yer first question is because group W wideband aerials covers the whole UHF band 21-68/69 and as such these antenna's are more sensitive to interference from distant transmitters during "inversion" than grouped aerials,although interference here can still occur but less problematic than those on group W wideband aerials.To yer second question the answer would probably be yes as late in September 2011 during a very warm sunny spell (under high pressure at that time) briefly on fr 24 which is home to the local BBCA multiplex on the local Halifax relay mast a few miles away from my current address ,the signals were replaced (rescanned obviously) temporarily by D3+4 multiplex also on fr 24 but from the main Sandy Heath transmitter,only for about a few minutes or so then disappeared,but the local BBCA mux from Halifax relay (fr 24),after a further rescan failed to pick up this transmission as such.The answer to yer third question is again probably yes as in the case of Belmont on Sunday night (13 Nov 2011),their three mux's that i can presently receive BBCA fr 22,D3+4 fr 25,SDN fr 30 was pixellating,breaking up disappearing into "No signal" mode,etc on and off for about a good 4 hours plus,while during this time period with my signal booster turned on i picked up Digitenne on fr 32 from Holland (vertically polarised),Sandy Heath's SDN fr 31,as well as Waltham transmissions.Oddly enough these came and went like switching a light bulb on and off.When Belmont's transmissions i described disappeared,the other foreign and other UK transmissions became visible (invisible with signal booster turned off and aerial plugged back in set-top box briefly),but when these alien transmissions disappeared (on and off initially) Belmont's transmissions returned (and disappeared/reappeared again).

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Belmont (Lincolnshire, England) Full Freeview transmitter
Wednesday 16 November 2011 1:31AM
Halifax

Will,Bridlington.Cambs/Beds signal denotes Sandy Heath transmitter you picked up with your amplified wideband aerial.Firstly there have been at present atmospheric conditions/inversion effect affecting mostly the eastern side of the UK the last few days or so,and as a result of this with the signal booster turned on yes you will have on this rare occasion received Sandy Heath transmissions as such.On a different note you mentioned you have a signal booster/splitter in yer loft,is this because of Belmont's 50kw SDN on fr 30,and for another week that is both 4kw powered understrength ArqA on fr 53 and ArqB on fr 60.From next week (Wed 23 Nov 2011) when Tacolneston goes fully digital,the two 4kw mux's ArqA,ArqB will increase in power 25 times up to 100kw (SDN remains 50kw).

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Belmont (Lincolnshire, England) Full Freeview transmitter
Wednesday 16 November 2011 1:48AM
Halifax

Will,Bridlington.Just out of interest come September 2012 next year,Bilsdale transmitter will go all digital.As a potential option come that time have you considered diplexing your current Belmont aligned group W wideband aerial with a second group K aligned aerial facing Bilsdale as Bridlington will possibly become part of an enlarged overlapped Bilsdale area,or if yer not that really interested in regional news programming from the Belmont mast BBC Look North from Hull (Peter Levy),and ITV1 Calendar (East Yorkshire/Lincolnshire part)you could realign yer current aerial towards Bilsdale by the time DSO there is complete.

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Belmont (Lincolnshire, England) Full Freeview transmitter
Wednesday 16 November 2011 2:16AM
Halifax

Monty in Cleethorpes.The other frequencies you picked up that you mentioned Arq B on fr 48 and ArqA on fr 67,were from the Sandy Heath transmitter.Did the device state under transmitter name Cambs and Beds or Yorkshire,the former is Sandy Heath while the latter is Emley Moor.However i must stress that Emley Moor also broadcasts ArqB on fr 48 as well,and from Wedesday 23 November 2011 when Tacolneston goes all digital,the ArqA mux on fr 67 from Sandy Heath will relocate to fr 52 exactly the same as Emley Moor who also broadcasts ArqA on fr 52 as well.Also on Wednesday 23 November 2011 Belmont's currently understrength 4kw each powered ArqA on fr 53 and Arq B on fr 60 will increase 25 times in power to 100kw each.

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Belmont (Lincolnshire, England) Full Freeview transmitter
Wednesday 16 November 2011 2:23AM
Halifax

John Lindley,Bridlington.Hard to say without a full postcode.From what you described it is not a transmitter problem,it is a problem relating to atmospheric conditions/inversion effect affecting mostly eastern UK the last few days or so.It should abate once low pressure weather systems sweep in soon.

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Belmont (Lincolnshire, England) Full Freeview transmitter
Wednesday 16 November 2011 2:33AM
Halifax

One more week to go.Once Tacolneston enters DSO2 in the early hours of Wednesday 23 November 2011 the understrength Belmont multiplexes on fr 53 and fr 60,ArqA & ArqB respectively will increase in power 25 times from 4kw to 100kw.Hopefully i will be able to receive these as such and relegate Emley Moor to emergency status only.To rephrase that i'm implying that i will only use Emley Moor transmissions in emergency cases only such as when Belmont next have an inversion effect scenario,and also i don't bother much with Emley Moor regional news bulletins.

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Tacolneston (Norfolk, England) Full Freeview transmitter
Wednesday 16 November 2011 2:53AM
Norwich

Jon,Norwich.West Runton most unlikely to affect your signal quality as such,Overstrand probably also unlikely to affect your signals too.The most likely effect is what i mentioned previously that being the "Inversion Effect" happening over the last few days or so mainly over eastern UK,and until low pressure weather systems sweep in soon you will have to put up with it until the weather becomes unsettled.

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Tacolneston (Norfolk, England) Full Freeview transmitter
Wednesday 16 November 2011 3:01AM
Halifax

Correction to my above post.My location is Halifax not Norwich.My apologises for inputting the incorrect location.

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