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Aerial for freeview and analogue



 
 
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  #1  
Old December 31st 06, 03:49 AM posted to uk.tech.digital-tv
col.del1
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Posts: 4
Default Aerial for freeview and analogue

I upgraded my aerial to a £45 wideband unit and get digital but still
have some minor ghosting when using analogue TV. Would a £45 Group A
aerial be a better choice to reduce ghosting and would a cable upgrade
help. I live 25 miles NNW of the Crystal Palace transmitter and
analogue signal is best on BBC but slightly less good on ITV and C5.
Thanks, Colin

  #2  
Old December 31st 06, 10:03 AM posted to uk.tech.digital-tv
Andy Burns
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Default Aerial for freeview and analogue

col.del1 wrote:

I upgraded my aerial to a £45 wideband unit and get digital


Wideband is not necessary for analogue or digital reception from Crystal
Palace, a group A aerial would give better performance, infact a
wideband yagi aerial performs worst within the Group A frequencies

http://www.aerialsandtv.com/aerials.html


some minor ghosting


Depends on what is causing the ghosting, but if digital reception is
good is it really worth worrying about analogue with switch off on the
horizon? i.e. spend the money on an STB you'll need eventually anyway,
rather than another aerial you won't.

analogue signal is best on BBC but slightly less good on ITV and C5.


C5 analogue doesn't come from Crystal Palace, but from Croydon instead,
it fits in just at the (revised) top of group A.
  #3  
Old January 1st 07, 10:43 PM posted to uk.tech.digital-tv
col.del1
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Default Aerial for freeview and analogue


Thanks for the comments/info but still have same question as to which
is best type of aerial to reduce ghosting. I wanted Freeview for the
range of channels as quality is not up to that of analogue (exception
being no ghosting!). Freeview does not have the level of detail
analogue has and also shows pixellation/artefacts when fast
motion/bright lights are shown (eg. pop concerts) so I want to retain
analogue for as long as i can.
Thanks

  #4  
Old January 2nd 07, 12:42 AM posted to uk.tech.digital-tv
Andy Burns
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Posts: 185
Default Aerial for freeview and analogue

col.del1 wrote:

Thanks for the comments/info but still have same question as to which
is best type of aerial to reduce ghosting.


A log periodic should be more directional, so might allow you to align
it to avoid reflections causing ghosting, it will be wideband so have
lower gain than a group A yagi, but will have even response across all
groups rather then falling off towards group A end of spectrum like a
wideband yagi.

The more difficult alternative would be stacking multiple group A yagis
into a phased array ...

  #5  
Old January 2nd 07, 10:08 AM posted to uk.tech.digital-tv
charles
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Default Aerial for freeview and analogue

In article ,
Andy Burns wrote:
col.del1 wrote:


Thanks for the comments/info but still have same question as to which
is best type of aerial to reduce ghosting.


A log periodic should be more directional,


It depends in which direction. In comparison with a yagi, a log has a much
wider front lobe, but is much 'cleaner' at the back and sides. So, using a
log to reduce ghosting will depend on the direction from which the ghost
originates.

--
From KT24 - in "Leafy Surrey"

Using a RISC OS computer running v5.11

  #6  
Old January 2nd 07, 11:11 AM posted to uk.tech.digital-tv
Andy Burns
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Posts: 185
Default Aerial for freeview and analogue

charles wrote:

It depends in which direction. In comparison with a yagi, a log has a much
wider front lobe, but is much 'cleaner' at the back and sides. So, using a
log to reduce ghosting will depend on the direction from which the ghost
originates.


I did say "might", does the OP know how far off-beam the source of the
ghosting is?
  #7  
Old January 3rd 07, 01:58 PM posted to uk.tech.digital-tv
col.del1
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Posts: 4
Default Aerial for freeview and analogue


Andy Burns wrote:
I did say "might", does the OP know how far off-beam the source of the
ghosting is?


I should have said this earlier. For various reasons (not worth
discussing) my aerial has to be in the loft so the source of ghosting
could be varied, but unlikely to come from nearby tall buildings or
trees since there's only houses.

From other website info it seems i'm lucky to get away with just some

minor ghosting but a change to a group A aerial might improve the gain
so less ghosting and less signal deterioration when it rains (due to
the roof getting wet i gather), but then again i might end up with
something worse.

I shall probably try a £25 grp A from Blake aerials or Antiference for
curiosity and feed the kid's TVs with it to replace their dodgy
portable aerials and get C5 for them, so i won't lose out even if the
signal is no better. Thanks, Colin

 




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