DFMO Omnidirectional combined FM &

Omnidirectional combined
FM & DAB antenna/aerial
Aerial assembly
Remove any tape/elastic bands around the boom, dipole and elements and assemble as shown
below (with drawings). Ensure all wing nuts are securely tightened. Aerials are mounted as
shown. Fix the aerial to a suitable mast using the clamp assembly as shown. Check that all
fixings are tight.
Fitting coaxial cable
Use good quality double screened coaxial cable (sometimes known as satellite cable). Remove
cover from terminal box and push cable through aperture. Do not enlarge hole as it may allow
water ingress. Trim off approximately 15mm of the outer cable sheath with a craft knife or similar
to expose braid (and foil if double screened). Fold braid back over sheath (cut away foil flush to
outer sheath) to expose plastic dielectric. Cut away dielectric to leave 10 mm of the centre
copper wire exposed. Loosen clamp screws, slide cable under clamp and push centre wire
through hole in terminal post. Braid should be positioned underneath clamp but not beyond it.
Tighten braid clamp screws before tightening the centre conductor screw (do not over-tighten).
Ease cap down cable and fit securely onto terminal box.
5 mm
10 mm
Reception hints
DAB aerial - in areas classed as having DAB service this aerial will frequently give satisfactory
results when mounted in a reasonably clear position in a roof space. In weak-signal (fringe)
areas, outdoor mounting in a clear high position may be necessary. This aerial is
omnidirectional and will not normally need any adjustment after fitting.
This aerial is suitable for direct connection to the antenna socket of any DAB portable radio or
tuner. With the majority of portables the internal aerial must be disconnected first. The aerial
may be used in conjunction with a signal distribution amplifier having a suitable input, or with a
passive splitter, to feed multiple outlet points.
FM aerial – In areas classed as having FM service this aerial will frequently give satisfactory
results when mounted outdoors in a clear high position (ideally 1 metre above your roof and any
other aerials). It may work adequately in a loft space in a strong signal area but signals may be
degraded by loft insulation, roof tiles etc. This aerial is notionally omnidirectional but it may be
beneficial to vary direction slightly for best results after mounting.
This aerial is for direct connection (or via a suitable wall outlet plate) to the antenna socket of
any FM tuner or portable radio that has an appropriate antenna input socket fitted. A diplexer
such as the PROception proCOM21VU or proCOM31T may be used to combine the DAB and
FM signals with TV signals from other aerials. In strong signal areas a passive splitter such as
the PROception proMHS12P or proMHS14P may be used to feed multiple outlet points.
This aerial can also be used with a suitable signal distribution amplifier from the PROception
range. In some areas FM signals can be extremely strong and it may be necessary to fit an
attenuator on the VHF input of the amplifier to prevent signal overload, the effect of which is to
degrade all signals passing through the amplifier.
Safety: Working at height – carry out work outdoors at height only if you are competent
in the use of ladders and related access equipment. Always work safely within your own
limitations, ensuring that all equipment used is appropriate and is in good condition.
Further advice may be downloaded from: www.blake-uk.com/downloads on:
• reception problems • distributing TV signals around the home • general recommendations.
Digital UK Coverage checker http://www.digitaluk.co.uk/ (select detailed view box).
BBC Reception Advice 08700 100123, e-mail reception@bbc.co.uk, web: www.bbc.co.uk/reception
No. of
combined FM and DAB
FM: 86-108
DAB: 175240
FM: 0dB
DAB: 0dB
Front to
FM: 360°
DAB: 360°