In message , tony sayer
writes
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 think that the first questions a
1. What is the existing loft aerial (vertical, horizontal, dipole,
groundplane, random piece of dangling wire etc)?
2. Have you tried connecting the existing FM feed (which presumably has
a traditional Belling Lee connector) to the DAB F input (using an
adapter)?

If you already get good FM, and the DAB also seems good, then you may
get away with a simple 2-way splitter (preferably a 'proper' 3.5dB
splitter, and not a cheaper 6dB resistive job). If not, an even
more-proper low-loss filtered splitter/diplexer would be better.
[However, if you really do need a filtered job, signal levels must be
rather marginal.]

If you don't get good DAB using the existing FM, aerial, then you'll
have to think about improving things - but only cross that bridge when
you come to it.
--
Ian