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#391581 - 26th Feb 2010 6:35pm How to improve the freeview signal
Wheels Offline
Wiki Veteran

Registered: 4th Jan 2005
Posts: 8795
Loc: Tranmere
Hi guys n girls I need your help.

I bought a small hand held tv with built in freeview, my problem is that I can't get a decent signal to watch any channel. The arial Is rather small (about a foot) some I'm guessing that's just not enough for this region?



this is it, I took the back off and found out it uses the F type connection (like the wire from a cable box looks like) . Now what should I do? Buy a larger 1.2m arial with an f connection or will that still not be enough? It will kind of defeat the point of a hand held tv if I have to use a powered f connection boosted arial frown

Connection:

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#391596 - 26th Feb 2010 7:46pm Re: How to improve the freeview signal [Re: Wheels]
diggingdeeper Offline

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Registered: 9th Jul 2008
Posts: 9888
Loc: Birkenhead
A longer aerial is unlikely to improve the signal by much as the aerial has to resonate at the correct frequency for optimum performance.

The correct length is roughly just short of 40 cm (quarter wavelength at 800Mhz), at 80 cm (double length) it will actually end up with virtually no signal. This is a bit theoretical and not totally true in practice because there is no "proper" ground plane.

Going further in theory, at 120cm it only works as well as 40cm because 80cm of it will just cancel itself out.

You can get higher gain "rods" that are 5/8 or 7/8 wavelengths long but these need coils in them to shift the phase and stop the cancellation (getting even more techy)


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#391597 - 26th Feb 2010 8:00pm Re: How to improve the freeview signal [Re: diggingdeeper]
Wheels Offline
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Registered: 4th Jan 2005
Posts: 8795
Loc: Tranmere
So what should I do then?

I can get all the buts from maplin Liverpool if I need to build it differently ?

Should I just get a F type mains boosted arial instead?

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#391606 - 26th Feb 2010 8:19pm Re: How to improve the freeview signal [Re: Wheels]
diggingdeeper Offline

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Registered: 9th Jul 2008
Posts: 9888
Loc: Birkenhead
Must be some small battery powered amplified aerials around somewhere (caravan aerials at Maplin?). Most of the mains ones will have a power supply which you could just replace with a battery.

Depends on how portable you want it, a small yagi aerial (even 3 elements) will normally out-perform rod type aerials, but I have seen some amplified twin rods do much better than I thought.

Don't know if you are in Storeton TV transmitter footprint or not, trying to get a decent signal from Winterhill on a portable aerial is a struggle for a lot of Wirral.

Don't get the horizontal loop aerials these don't have a lot of gain as they are designed not to be directional more than high performance, the more directional an aerial is, the higher the gain (just like narrowing a torch beam makes it brighter).

Its not clear in Maplins catalogue which are mains amplifiers and which aren't.

Difficult to tell which small aerials are just gimmicky designs and which are genuinely engineered. Best is to ask around and find somebody that uses one successfully.

When it comes to amplifiers, although saying it has 20dB gain (that is multiplying received power by 100) doesn't mean much if it doesn't have a low noise amplifier, because the noise gets amplified as well.

In other words - suck it and see, take it back if it is useless.
_________________________
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell

When the debate is lost, slander becomes the tool of the loser. Socrates

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#391614 - 26th Feb 2010 8:39pm Re: How to improve the freeview signal [Re: diggingdeeper]
Wheels Offline
Wiki Veteran

Registered: 4th Jan 2005
Posts: 8795
Loc: Tranmere
Thanks DD your a top bloke! I will keep you informed on the outcome smile

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#391618 - 26th Feb 2010 8:55pm Re: How to improve the freeview signal [Re: Wheels]
Wheels Offline
Wiki Veteran

Registered: 4th Jan 2005
Posts: 8795
Loc: Tranmere
Might try these:

mains powered: http://www.maplin.co.uk/Module.aspx?ModuleNo=97986

battery powered: http://www.maplin.co.uk/Module.aspx?ModuleNo=25649

I will have to buy the correct connection for the battery one as it does not specifiy what connection it has frown

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#391704 - 27th Feb 2010 2:08am Re: How to improve the freeview signal [Re: Wheels]
MattLFC Offline
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Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
The very best indoor ariel available for Freeview reception, and this is fact not fiction, is http://www.amazon.co.uk/digiTop-Amplifie...1996&sr=1-1

If this does not get good reception, no other indoor ariel will give better, and your option will be an outdoor one.

In general, a booster won't do a particuarly great deal for a digital ariel as all they usually do is add noise to the signal (fine for analog, not so for digital).

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#391709 - 27th Feb 2010 2:25am Re: How to improve the freeview signal [Re: MattLFC]
Wheels Offline
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Registered: 4th Jan 2005
Posts: 8795
Loc: Tranmere
Tar Matty, I will try out all options smile

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#391735 - 27th Feb 2010 12:10pm Re: How to improve the freeview signal [Re: Wheels]
diggingdeeper Offline

Wiki Guardian

Registered: 9th Jul 2008
Posts: 9888
Loc: Birkenhead
Good find Matt, mixed reviews but obviously works for some. One of the reviewers mentioned the Technika TT-02 from Tesco's as working when that one didn't so might be worth a go.

Don't forget, if you are pointing at Storeton, that transmitter is vertical polarisation so need to turn horizontal aerials on their side. All the big transmitters are horizontal (Winterhill, Moel-y-Parc etc).
_________________________
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell

When the debate is lost, slander becomes the tool of the loser. Socrates

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#391737 - 27th Feb 2010 12:47pm Re: How to improve the freeview signal [Re: diggingdeeper]
MattLFC Offline
Wiki Master

Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
Yeah, I can't remember why I came across it (may well have been on the AV Forums), but it's been tested for digital-uk and there is an in-depth PDF report somewhere on the web, and it was found to be the very best indoor ariel. So I thought hmmm, ill bookmark that, may come in handy someday.

laugh

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#392016 - 28th Feb 2010 6:56pm Re: How to improve the freeview signal [Re: MattLFC]
Wheels Offline
Wiki Veteran

Registered: 4th Jan 2005
Posts: 8795
Loc: Tranmere
Ok been and got a few parts from Maplin today.

First of all I got a convertor to change the F type to a standard fitment.



Then the 2x AA powered Booster with flexible aerial.



Now my signals are pretty good
(TV)

(Radio)


However on the channel I get this

??? it has a good signal but says No signal? It works great when the quality % bar has even a low rate.

If I sit on my bed with it on my leg it works fine and displays all the channels in great quality. but in other places it displays nothing even tho a good signal is present?

why is that and how can I fix it?

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#392046 - 28th Feb 2010 9:10pm Re: How to improve the freeview signal [Re: Wheels]
diggingdeeper Offline

Wiki Guardian

Registered: 9th Jul 2008
Posts: 9888
Loc: Birkenhead
You haven't got a VCR or other equipment with a modulator output in the vicinity.
_________________________
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell

When the debate is lost, slander becomes the tool of the loser. Socrates

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#392047 - 28th Feb 2010 9:23pm Re: How to improve the freeview signal [Re: diggingdeeper]
Wheels Offline
Wiki Veteran

Registered: 4th Jan 2005
Posts: 8795
Loc: Tranmere
I do have an old VCR under the stairs?

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#392057 - 28th Feb 2010 9:39pm Re: How to improve the freeview signal [Re: Wheels]
diggingdeeper Offline

Wiki Guardian

Registered: 9th Jul 2008
Posts: 9888
Loc: Birkenhead
I meant switched on, and giving out a signal that may be blocking the digital signal.

Another possibility is that it is not uncommon for amplifiers to self-oscillate at some frequency as well, try moving the cables or putting aluminium foil round it and see if signal level changes (desperate thoughts!).
_________________________
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell

When the debate is lost, slander becomes the tool of the loser. Socrates

Top
#392065 - 28th Feb 2010 10:35pm Re: How to improve the freeview signal [Re: diggingdeeper]
Wheels Offline
Wiki Veteran

Registered: 4th Jan 2005
Posts: 8795
Loc: Tranmere
not sure if I done this correct lol



The signal is now very erratic frown


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