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uk.tech.digital-tv (Digital TV - General) (uk.tech.digital-tv) Discussion of all matters technical in origin related to the reception of digital television transmissions, be they via satellite, terrestrial or cable. Advertising is forbidden, with no exceptions.

Picture break up HD Emley Moor?



 
 
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  #1  
Old July 2nd 15, 09:06 PM posted to uk.tech.digital-tv
Steph[_2_]
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Posts: 3
Default Picture break up HD Emley Moor?

I have a Samsung 22" Freeview HD smart Tv, its about 8 months old.

I find the picture is breaking up on the HD mux when connected to the
main aerial. Its fed via RF2 of a sky box, but still has the problem
when its straight in the roof aerial. Ive tried a 24db attenuator and
with a further 12db in series, still no better.

Signal strength is 98% with quality at 100% but every 10 to 20 seconds
both drop to zero and bit error rises to 2000.

I have a clear line of sight to Emley Moor at around 6 miles away. The
best results is with a fly lead and a kitchen knife in the end. That
gave 100% strength and quality but the error problem still occurred but
not as severe.

The other TV I Have with Freeview HD is a Sony and is not affected.

Could this be a 4g issue? Any thoughts?
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  #2  
Old July 3rd 15, 10:28 PM posted to uk.tech.digital-tv
Andy Wade
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Posts: 442
Default Picture break up HD Emley Moor?

On 02/07/2015 22:06, Steph wrote:
[...]

Signal strength is 98% with quality at 100% but every 10 to 20 seconds
both drop to zero and bit error rises to 2000.

[...]

Could this be a 4g issue? Any thoughts?


Possibly radar interference from Fylingdales or Menwith Hill? AFAIK
these radars operate below the TV band (420-450 MHz) and emit very high
peak powers.

So try a highpass (or bandpass) filter - e.g. a 'Tetra filter'


--
Andy
  #3  
Old July 4th 15, 10:32 AM posted to uk.tech.digital-tv
Brian-Gaff
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Posts: 576
Default Picture break up HD Emley Moor?

Well might be, but it sounds more like some kind of impulse issue, or maybe
some other service that is producing out of band interference, which
momentarily swamps the front end.

Must be pretty big if it still comes in with some of your test results
though. Could it be mains borne perhaps
? Electric air freshener perhaps?
Brian

--
From the Sofa of Brian Gaff Reply address is active
"Steph" wrote in message ...
I have a Samsung 22" Freeview HD smart Tv, its about 8 months old.

I find the picture is breaking up on the HD mux when connected to the main
aerial. Its fed via RF2 of a sky box, but still has the problem when its
straight in the roof aerial. Ive tried a 24db attenuator and with a
further 12db in series, still no better.

Signal strength is 98% with quality at 100% but every 10 to 20 seconds
both drop to zero and bit error rises to 2000.

I have a clear line of sight to Emley Moor at around 6 miles away. The
best results is with a fly lead and a kitchen knife in the end. That gave
100% strength and quality but the error problem still occurred but not as
severe.

The other TV I Have with Freeview HD is a Sony and is not affected.

Could this be a 4g issue? Any thoughts?



  #4  
Old July 4th 15, 10:34 AM posted to uk.tech.digital-tv
Brian-Gaff
external usenet poster
 
Posts: 576
Default Picture break up HD Emley Moor?

Not so sure, many radars are up in between the various mobile phone bands
around here in surrey. the lower frequencies are often ham radio and some
other services, like airport walkie talkies and the like.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"Andy Wade" wrote in message
...
On 02/07/2015 22:06, Steph wrote:
[...]

Signal strength is 98% with quality at 100% but every 10 to 20 seconds
both drop to zero and bit error rises to 2000.

[...]

Could this be a 4g issue? Any thoughts?


Possibly radar interference from Fylingdales or Menwith Hill? AFAIK these
radars operate below the TV band (420-450 MHz) and emit very high peak
powers.

So try a highpass (or bandpass) filter - e.g. a 'Tetra filter'


--
Andy



  #5  
Old July 15th 15, 01:31 PM posted to uk.tech.digital-tv
Woody[_5_]
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Posts: 1,865
Default Picture break up HD Emley Moor?


"Andy Wade" wrote in message
...
On 02/07/2015 22:06, Steph wrote:
[...]

Signal strength is 98% with quality at 100% but every 10 to 20
seconds
both drop to zero and bit error rises to 2000.

[...]

Could this be a 4g issue? Any thoughts?


Possibly radar interference from Fylingdales or Menwith Hill? AFAIK
these radars operate below the TV band (420-450 MHz) and emit very
high peak powers.

So try a highpass (or bandpass) filter - e.g. a 'Tetra filter'


For the record there is no radar at MH - it is purely a comms station
mainly listening to other people's satellites.

Fylingdales does have some UHF capability but AFAIK it operates at
much lower frequencies than that!


--
Woody

harrogate3 at ntlworld dot com


  #6  
Old July 26th 15, 07:35 PM posted to uk.tech.digital-tv
Steph[_2_]
external usenet poster
 
Posts: 3
Default Picture break up HD Emley Moor?

On 04/07/2015 11:32, Brian-Gaff wrote:
Well might be, but it sounds more like some kind of impulse issue, or maybe
some other service that is producing out of band interference, which
momentarily swamps the front end.

Must be pretty big if it still comes in with some of your test results
though. Could it be mains borne perhaps
? Electric air freshener perhaps?
Brian


An update, two face plates replaced with the screened Blake type. A
cheap y shape splitter removed and the cable connected with f connectors.

A vast improvement but still occasional break up on the hd mux. Any
thoughts on a filter and a online link if poss.

TIA.
 




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