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Best position for a DAB aerial?


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Old 03-11-2009, 10:18
Stator
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What's the best way to align a DAB aerial?

Unfortunately the aerial that comes with my Philip DAB MCB204 is not detachable or replacable, it's one of those long wire ones with a fork at the end and two dangly bits.

I'm having trouble getting the 'regional' DAB stations but get the National/BBC ones fine.

Can anyone advise a good way to align the aerial? Are they better horizontal or vertical or wrapped around a tortoise?

Thanks


Forgot to mention I also have a goodmans personal DAB radio that uses the headphones as the aerial and that gets all stations perfectly in exactly the same spot
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Old 03-11-2009, 11:14
Simon Blake
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All DAB transmissions in this country are vertically polarized, so you need to align your aerial to match.

Don't forget that all receivers vary in their sensitivity, and you may well find that a portable is designed to be more sensitive, since it needs to work in as many places (and positions) as possible.

Simon
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Old 03-11-2009, 16:21
FM_Bandit
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Vertically supposedly but if you're DX-ing distant Muxes I've found trial and error to produce the best results, much like with a FM wire aerial. Having the set on the first floor and near to a window will help too!
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Old 03-11-2009, 16:42
KennyKeen
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Can you get the MCB204 to display signal strength? My Roberts bed-side clock radio does, and I used the display to find the best position by trial and error.

The point being that with digital radio, like digital TV, you can't go by the quality of the sound (or picture) to find the best aerial position. You can only find out where it doesn't work.

But vertical is a good start
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Old 03-11-2009, 18:07
jaffboy151
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In the bin............. as there is nothing worth listening to on it anymore
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Old 03-11-2009, 19:24
Ramsay Ladders
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In the bin............. as there is nothing worth listening to on it anymore
God would disagree.
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Old 03-11-2009, 20:14
GrannyGruntbuck
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Dab reception is so hit and miss.

In one position reception could be awful, but move the radio only a few inches literally and the signal is booming!

Very annoying.
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Old 04-11-2009, 06:00
Germany bound
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have to agree about hit and miss with DAB

For those who know Ilfracombe,I took my DAB radio on top of lantern hill.

Could not get BBC Wales(swansea area)on DAB
but could get BBC Wales(cardiff area)

moved TWO YARDS and then got the BBC wales(swansea area)

BBC radio devon on DAB? never in a million years even on top of lantern hill

and FM ain't a lot better
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Old 04-11-2009, 07:32
kev
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Draped over the radiator then Blu-Tacd to aluminium window frame worked best for me - Long wire aerials are rubbish - my Pure Chronus alarm clock has it's wrapped around some more wire (the "aerial" from my AV Amp as it happens) which then extends it to the top of the window frame.

Annoying as even my Pocket DAB picks up DAB easier!
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Old 04-11-2009, 19:37
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Thanks for the suggestions but nothing has helped so far

I've tried wrapping it around a curtain pole, but no difference.

The hi-fi does display the error rate, which I guess is the reverse of the signal quality. One the BBC stations I get around 12 errors, I don't know if that is per second or what, but the sound is perfectly fine. When I try anything else like wrapping the aerial around a curtain pole it just seems to go up
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Old 04-11-2009, 20:02
kev
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Thanks for the suggestions but nothing has helped so far

I've tried wrapping it around a curtain pole, but no difference.

The hi-fi does display the error rate, which I guess is the reverse of the signal quality. One the BBC stations I get around 12 errors, I don't know if that is per second or what, but the sound is perfectly fine. When I try anything else like wrapping the aerial around a curtain pole it just seems to go up
The error rate seams to be a percent figure. On all my DAB radios

0 is perfect
20 is also perfect
21-30 are usually perfect but suffer the odd drop out
31-40 are bubbling mud, but listen able for short periods
41-70 are unlistenable bubbling mud
71+ result in silence.

The signal strength can often be accessed by pressing the "select" button - you want black blocks to the right of the empty one

For example http://kjs.me.uk/dabsig/npd_12B_BBC.JPG is useless http://kjs.me.uk/dabsig/NOW%20Leicester.png is very borderline and likely to result in drop outs http://kjs.me.uk/dabsig/BBC%20National%20DAB.png is better and http://kjs.me.uk/dabsig/NOW%20Nottingham.png is perfect
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Old 05-11-2009, 10:45
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All of a sudden they're back with a perfect zero error rate. Maybe it's the weather
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Old 05-11-2009, 17:48
d-denny
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From memory each 'leg' of the dipole aerial is approx
13 inches long,mine is attached to a bamboo cane.
going into a short length of coax then into a coax socket on my receiver.That gives me excellent results.

D.A.B is on a much higher frequency than fm band at around 220-230mhz,therefore a proper length aerial
will give you much improved results over a random
length of wire! Hope that helps.
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Old 06-11-2009, 18:35
kev
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All of a sudden they're back with a perfect zero error rate. Maybe it's the weather
I've noticed a few issues from the Nottingham Mapperley Ridge transmitter recently, high signal strenght, but also high error rate - odd.
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