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Tuesday, 18 November 2014
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Mike Buttriss9:34 AM
Launceston
Hi,
Glitching on BBC programs only;
I receive my signals from Caradon Hill Tx. through a high gain aerial with mast amplifier as I am located in a valley. This fed to a distribution amp a Labgear HDU681 an 8 way unit. RF out from Sky is fed to the Uplink side of the HDU681. No Satellite signals are fed through the unit which is switched to UHF. RF out from SKY unit is set to Ch68 well away from received signal frequencies. BBC1 and BBC2 occasionally glitch, pixilation of picture / freezing. It does not happen on other channels at all.
Signal strength is good showing 90 % on the TV signal strength, and we are using on that TV a flooded coax cable feed. Other TVs in the house also glitch on BBC channels fed by standard coax cable via standard wall plate /cables. Why on only BBC channels does it happen?
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Mike's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
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MikeB11:10 AM
Mike Buttriss: Your just 14km from Caradon Hill - you have no need of a masthead amp, and if you look at the signal strength of the BBC channels, they are just too high for your tuners. Frankly, your lucky its only happening occasionally.
See here for more info: Freeview signals: too much of a good thing is bad for you
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Dave Lindsay
1:32 PM
1:32 PM
Mike Buttriss: In answer to your question, let me answer it the other way around: "Why are all other channels received OK?"
Signals travel in straight lines. If you don't have line-of-sight then you are relying on the bending effect over objects that are in the way. Generally speaking, the more that you are away from line-of-sight the more likely you are to find that in one particular spot some signals are good and others not so. Plus, you also have the effect of the trees of Trebursye Wood which are in your way and which will therefore likely affect the signals, each one to differing degrees because they are at different frequencies.
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Thursday, 20 November 2014
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Mike Buttriss9:33 AM
Launceston
Mike Buttriss:
All,
Thanks for tips on resolving the problem. I'll try attenuating the signal coming in to the distribution amp down by 25 % and see what happens. Makes sense on the ducting around areas of trees at different frequencies. Perhaps a chain saw would sort that bit out. Thanks again.
Mike
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Mike's: mapM's Freeview map terrainM's terrain plot wavesM's frequency data M's Freeview Detailed Coverage
Friday, 4 March 2016
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Walter raybould11:47 AM
Hello, I cannot receive AL JAZEERA english, since it left ch133. the list tells me to go to ch HD108. but when i try i get a screen notice INVALID channel. I can get 4HD channels but not 108. I live within the Winter hill transmission. I have an up to date full hd tv (Panasonic smart tv) no tv pkge from the providers. only use Freeview and internet. and i have re-tuned my tv. My accommodation is using a communal aerial, there are no other reception problems.
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