Freeview Reception

espresso

village_life wrote:

i dont understand any of that :-)

fair enough I may need a signal booster - however, when you logically think about it - i had a freeview connection (Via scart) to a 14" TV that gave 86 channels - put it into the back of a 28" tele and that goes down to 43 channels!

WHY?

You are not thinking logically!

The freeview receiver picks up i.e. receives the channels and then passes this onto the TV to display the picture/sound.

If you have the receiver plugged into your 14" TV and it receives xx channels and then you simply unplug the cable from the back of the 14" TV and plug it into another TV, it will display the same channels!

If on the other hand you move or switch off the receiver and then receive a different number of channels, that is a totally different thing, as the receiver will re-scan for available channels again. If you have a low signal strength, this could explain why this happens.

tweeter

Hi Peeps,
They built a new hotel over the road to me and it just kyboshed my picture and I live in Fulham and mines an old aerial.So I'm confused as whether to go for a wideband or something else,as around here the council and other houses have what looks like wideband and extra gain aerials.Thanks for any replies in advance as the Thank You button seems to have vanished.Thanks, tweeter.

Joe_Bloggs

Take note of the aerial signal path Does it now go through a video recorder before it gets to the digital tuner? Video devices often an an RF output that could coincide with a broadcast multiplex.You can often disable this feature.
There may bu some signal degradation in looping the rf signal in one device and out then in to another. You may find you can get better results by having the tuner first in line to the aerial feed.
It could be something else so try what worked before and see what is different. Make gradual changes and take notes.
J_B.

village_life

espresso wrote:

You are not thinking logically!

The freeview receiver picks up i.e. receives the channels and then passes this onto the TV to display the picture/sound.

If you have the receiver plugged into your 14" TV and it receives xx channels and then you simply unplug the cable from the back of the 14" TV and plug it into another TV, it will display the same channels!

but thats exactly what i did - replaced the scart cable from one TV to another (left the co-ax aerial cable in place) and lost all the channels.....

espresso

village_life wrote:

but thats exactly what i did - replaced the scart cable from one TV to another (left the co-ax aerial cable in place) and lost all the channels.....

Was the freeview receiver continuously powered up while you changed the cable from one TV to the other one :question:

melipona

http://www.wrightsaerials.tv/digitalterrtvrecep.htm
Dear Expresso, Ouch!

"Sorry but that is not true!"

All I can say is it worked for me, for anybody who is interested in why they can read the info in depth on the link above.

espresso

melipona wrote:

http://www.wrightsaerials.tv/digitalterrtvrecep.htm
Dear Expresso, Ouch!

"Sorry but that is not true!"

All I can say is it worked for me, for anybody who is interested in why they can read the info in depth on the link above.

Did you actually read all of the article?

The forward gain graph, shows how aerials designed for a specific group of frequencies have a much better gain when compared to a wideband aerial which should only be used when necessary.

"Not all transmitters need receiving aerials that cover the whole UHF band. In some cases only Groups A and B, or Groups B and C/D, are used. For the former use a Group K aerial, and for the latter a Group E (see fig 1 above). These aerials can be expected to perform better than the equivalent Group W array, which covers the whole band."

Bill would be the first to tell you that each aerial installation is different and the type of antenna used should reflect that.

Joe_Bloggs

@expresso and all.
Do you think that the BBC/ Government have skimped on the importance of a good aerial installation and wiring in their digital propaganda campain. They have dumbed down/cut their science based shows and are just going to create so much dissapointment for their £300 million spend in this area. Where I live I can walk down a street and see aerials that vary by 40 degrees in direction. They also vary 40 degrees in elevation. The reason for the directional range is you can actually see, at roof top height, two transmitters.
Only one broadcasts digital TV ! Half the aerials point at the wrong transmitter which only broadcasts analogue C5.
J_B.

irnbru_2

Joe_Bloggs wrote:

Do you think that the BBC/ Government have skimped on the importance of a good aerial installation and wiring in their digital propaganda campain.

The wiring shouldn't have an impact, it's the strength of the received signal that counts. Singal power will boosted when the analogue is switched off.

Joe_Bloggs wrote:

Only one broadcasts digital TV ! Half the aerials point at the wrong transmitter which only broadcasts analogue C5.

If one TX isn't broadcasting the digital channels this will be a problem as surely the postcode indicator will tell them they can receive it but they won't know which transmitter they're aligned with until they install the STB and have no reception. Very confusing!

Joe_Bloggs

@irnbru
There a losses in cables and they are likely to be far greater in old cables that have perished outer insulation. The sheilding of the new cheap cable may not be that good to save on expensive copper. In pointing at the right digital in the case I mentioned then they will lose analoge channel five.

The consumer with a duff aerial setup will have tried and failed to get a digital terrestrial TV setup, before the analogue switch off. I feel more sorry for those in blocks of flats with communual aerials.
J_B.