On Jan 21, 7:21*pm, Mark Carver wrote:
Don Pearce wrote:
That should do nicely. I know DAB is supposed to use mulitpath signals
actively, but I did some simulations ages ago, and you still get much
better performance by choosing the nearest transmitter and aiming a
directional antenna at it.

As an aside. I've always used my vertical Band II (aka FM band) dipole for
DAB....

theres' a house near me whose just had a DAB aerial installed on a
pole on the roof. it's the Maplin high gain one one, mounted
horizontally!

Robert

Don Pearce wrote:

That should do nicely. I know DAB is supposed to use mulitpath signals
actively, but I did some simulations ages ago, and you still get much
better performance by choosing the nearest transmitter and aiming a
directional antenna at it.

As an aside. I've always used my vertical Band II (aka FM band) dipole for
DAB, it works very well, pulling in distant muxes from miles away. I lashed up
a properly cut dipole for DAB (225 MHz), and stuck it nearby. It was no better
(or worse) than the Band II.

Of course the Band II dipole is half wave within its band, but full wave(ish)
in the DAB band.

I split the feed passively between my FM tuner in the living room, and DAB
'Midi' system in the kitchen.


--
Mark
Please replace invalid and invalid with gmx and net to reply.

In article ,
Mark Carver wrote:
Don Pearce wrote:

That should do nicely. I know DAB is supposed to use mulitpath signals
actively, but I did some simulations ages ago, and you still get much
better performance by choosing the nearest transmitter and aiming a
directional antenna at it.

As an aside. I've always used my vertical Band II (aka FM band) dipole
for DAB, it works very well, pulling in distant muxes from miles away.
I lashed up a properly cut dipole for DAB (225 MHz), and stuck it
nearby. It was no better (or worse) than the Band II.

I know that theory - but had no success with it. My 4 element band III
works fine for FM when horizontal but is dreadful on DAB - and I'm in a
strong signal area. Swing it vertical and the DAB is fine - but FM noisy.
It's feeding a DA which feeds four tuners. The aerial is easy to get at as
it's accessible from my roof terrace and has clear line of sight to the CP
and Croydon transmitters - both of which are close to the same 'line'.
Removing the DA and plugging in the aerial direct makes no difference.

Of course the Band II dipole is half wave within its band, but full
wave(ish) in the DAB band.

Yes. Yet in my case a simple omni DAB aerial diplexed into the horizontal
FM one works fine - although I'd love to know why the vertical aerial
doesn't for FM.

I split the feed passively between my FM tuner in the living room, and
DAB 'Midi' system in the kitchen.

I have a second FM aerial mounted at the top of the house - horizontal -
which feeds just the one combined FM and DAB tuner. That works well on
both.

--
*A conclusion is the place where you got tired of thinking *

Dave Plowman London SW
To e-mail, change noise into sound.

On 21/01/2008 19:21, Mark Carver wrote:

I've always used my vertical Band II (aka FM band) dipole
for DAB, it works very well, pulling in distant muxes from miles away.

If you pull in distant (i.e. over 46 miles) signals won't that harm the
BBC SFN signal from your local TX? also you'll just get "n" copies of
Gold/Chill/Galaxy/Heart/Traffic/XFM

"Graham" wrote in message
...
You have reminded me that I still have a band III eight element aerial in
the garage. Designed for Croydon ch 9 use. I'll have to have a play with
that sometime.

The elements will be quite a bit too long. DAB equates to channel 12 more or
less.

Bill

In article , Dave Plowman (News)
scribeth thus
Just come back from my local B&Q by Wandsworth Bridge, and notice they
have DAB aerials in their 'one pound' section.

It's an external mount folded dipole type with F-type connector on the
aerial. Complete with wall mounting and 10m cable.

Not the highest quality I'm sure but maybe the best value anywhere?


Quite in keeping with what is UK DAB;!....
--
Tony Sayer

In article ,
tony sayer wrote:
In article , Dave Plowman (News)
scribeth thus
Just come back from my local B&Q by Wandsworth Bridge, and notice they
have DAB aerials in their 'one pound' section.

It's an external mount folded dipole type with F-type connector on the
aerial. Complete with wall mounting and 10m cable.

Not the highest quality I'm sure but maybe the best value anywhere?


Quite in keeping with what is UK DAB;!....

Nothing if not predictable. ;-)

--
*A day without sunshine is like... night.*

Dave Plowman London SW
To e-mail, change noise into sound.

In article , Dave Plowman (News)
scribeth thus
In article ,
tony sayer wrote:
In article , Dave Plowman (News)
scribeth thus
Just come back from my local B&Q by Wandsworth Bridge, and notice they
have DAB aerials in their 'one pound' section.

It's an external mount folded dipole type with F-type connector on the
aerial. Complete with wall mounting and 10m cable.

Not the highest quality I'm sure but maybe the best value anywhere?


Quite in keeping with what is UK DAB;!....

Nothing if not predictable. ;-)

Indeed...
--
Tony Sayer

"Dave Plowman (News)" wrote in message
...
Just come back from my local B&Q by Wandsworth Bridge, and notice they
have DAB aerials in their 'one pound' section.

It's an external mount folded dipole type with F-type connector on the
aerial. Complete with wall mounting and 10m cable.

Not the highest quality I'm sure but maybe the best value anywhere?

--
*If only you'd use your powers for good instead of evil.

Dave Plowman London SW
To e-mail, change noise into sound.

I'm off to B&Q to see if my local one has any. I got a good deal last year
on the MegaBoost TV aerial with preamp and PSU. £10 clearance and nearly
£50 in Argos. They're made by Philips.
The folded dipole is OK for loft mounted use and probably outdoors too.
Screwfix sell "quadplexers" for VHF/BAD/TV/SAT and suitable preamps that are
remotely powered. You could have VHF/DAB/TV aerials on the same mast.

In article , Pete Smith wrote:
I'm off to B&Q to see if my local one has any. *I got a good deal last year*
on the MegaBoost TV aerial with preamp and PSU. *£10 clearance and nearly*
£50 in Argos. *They're made by Philips.

I've just bought an internet radio in Comet for £39, less than you might spend
on an aerial for a DAB radio, and it doesn't need an aerial at all! Well, not
an external one at any rate. Presumably it has something built in that enables
it to pick up my wireless network anywhere in the house. I can either use it
as a little standalone bedside radio with its own loudspeaker, or listen in
stereo on headphones, or plug it into the hi-fi. Sound quality is variable,
but the best stations are a lot better than DAB, and there are *thousands* of
them!

Disappointingly, but perhaps not surprisingly, the British stations tend to be
among the worst for sound quality and reliability of connection, while the
best ones I've discovered (so far) are all foreign.

Rod.