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.

"Mark Carver" wrote in message
...
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.

In a normal reception area we always use a vertical FM dipole only for
radio, adding it to the system via a 80 to 250MHz filter. There's no problem
with DAB signal strength because the aerial is up on the roof as opposed to
in someone's house (which DAB is designed for) and because the limiting
factor is almost always co-channel signals. If DAB reception is poor (which
normally means the location is officially unserved) we use one of the
European BIII aerial meant for TV. This is because UK DAB aerials cover
channels 5 up and so they are wideband, and have gain of sweet **** all.

Bill

In a normal reception area we always use a vertical FM dipole only for
radio, adding it to the system via a 80 to 250MHz filter. There's no
problem with DAB signal strength because the aerial is up on the roof as
opposed to in someone's house (which DAB is designed for) and because the
limiting factor is almost always co-channel signals. If DAB reception is
poor (which normally means the location is officially unserved) we use one
of the European BIII aerial meant for TV. This is because UK DAB aerials
cover channels 5 up and so they are wideband, and have gain of sweet ****
all.

Some time ago you were raving about the Triax DAB 5 element. AFAICR it was
because it wasn't wideband.

I bought one and pointed it due north from my location about 30 miles south
of Sutton Coldfield. It's very good, bringing in about 100 channels (some
duplicates) but also stations from Shropshire and beyond, for which we are
well outside the service area.

The Birmingham stations are all "off the scale" whereas previously on the
internal rod antenna they weren't even being decoded.

"Doctor D" wrote in message
...
I bought one and pointed it due north from my location about 30 miles
south of Sutton Coldfield. It's very good, bringing in about 100 channels
(some duplicates) but also stations from Shropshire and beyond, for which
we are well outside the service area.

The Birmingham stations are all "off the scale" whereas previously on the
internal rod antenna they weren't even being decoded.

Interesting.

Bill

In article , Bill Wright
scribeth thus

"Doctor D" wrote in message
...
I bought one and pointed it due north from my location about 30 miles
south of Sutton Coldfield. It's very good, bringing in about 100 channels
(some duplicates) but also stations from Shropshire and beyond, for which
we are well outside the service area.

The Birmingham stations are all "off the scale" whereas previously on the
internal rod antenna they weren't even being decoded.

Interesting.

Bill



Not really. The difference an outside aerial makes from an indoor bit of
wire is very significant. A while ago I was playing about with a Denon
tuner in a Suffolk town not renowned for its signals, even mobile which
can be quite good. An ordinary vertical FM di-pole @ 10 MAGL made the
band come alive!..

If everyone were to use the right aerial then we could drop the ERP's by
a lot and therefore "save the planet" i.e. bailing out the titanic with
a teaspoon!...
--
Tony Sayer

On Wed, 23 Jan 2008 10:15:11 +0000, tony sayer
wrote:

In article , Bill Wright
scribeth thus

"Doctor D" wrote in message
...
I bought one and pointed it due north from my location about 30 miles
south of Sutton Coldfield. It's very good, bringing in about 100 channels
(some duplicates) but also stations from Shropshire and beyond, for which
we are well outside the service area.

The Birmingham stations are all "off the scale" whereas previously on the
internal rod antenna they weren't even being decoded.

Interesting.

Bill



Not really. The difference an outside aerial makes from an indoor bit of
wire is very significant. A while ago I was playing about with a Denon
tuner in a Suffolk town not renowned for its signals, even mobile which
can be quite good. An ordinary vertical FM di-pole @ 10 MAGL made the
band come alive!..

If everyone were to use the right aerial then we could drop the ERP's by
a lot and therefore "save the planet" i.e. bailing out the titanic with
a teaspoon!...

I also found that slighly moving a DAB aerial can make or break
reception. I was getting nothing on Cambridge DAB, then I moved the
DAB aerial down the mast about 12 inches and signal shot up to 80%.

Marky P.

On 2008-01-23 20:37:00 +0000, Marky P said:

I also found that slighly moving a DAB aerial can make or break
reception. I was getting nothing on Cambridge DAB, then I moved the
DAB aerial down the mast about 12 inches and signal shot up to 80%.

Marky P.

Remember that it's the signal quality as opposed to the strength that
matters. The two don't always correlate.

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