In message , RJH
writes
On 30/07/2013 12:17, tony sayer wrote:
In article , Gordon MacPherson gordon.macph
scribeth thus
I have a Cambridge azur 650T tuner. I have a single coaxial cable that at
present feeds from a loft aerial (external is not possible) into the FM
input via a coax connector. The DAB has an F type connector. I would like to
be able to use both FM and DAB from the single cable.

1. If it is possible, what would be the most effective way of setting this
up?
2. Is there an aerial that would support both FM and DAB? (I live in
Wareham, Dorset - BH20 5BB)

Thanks,

Gordon


Generally an FM vertical dipole, not that abortion known as a halo,
works quite well on DAB in a lot of areas. You should get a very good
signal from the Rowridge TX on the Isle of Wight. I believe that BBC DAB
is from there and the commercial from Chillerton down in the same
isle!..

Even if you used a 3 element Yagi I suspect there'd still be sufficient
DAB signal as well as enhancing the FM ones..

I think that there are FM/DAB Splitters around, never used one as this
is a DAB free zone!, do not use just a simple splitter as this will
halve the available signal on each band...


I was looking into this, and:

http://www.aerialsandtv.com/fmanddab...fFM&DABAerials

looks useful.

Useful maybe, but I always worry a little when I see comments like this:
"The round FM “Omni” type antennas do not perform as well as the
half wave dipole and this reflects their design, which gives a
theoretical minus 3 dBd gain figure. That's why we think they're crap
and we don't stock them."

There's nothing wrong with these omnidirectional 'halo' aerials provided
the user knows what the performance is, and knows that he can tolerate
the 3dB of signal loss compared with a straight halfwave dipole. But
being horizontally polarised, they are probably pretty useless when it
comes to the 'accidental' reception of vertically polarised DAB signals.
--
Ian