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Seal the BNC socket!
Although BNC connectors are protected against splashing water, they must be sealed
outdoors with a self-vulcanizing sealing tape for permanent use! (e.g. Nittotape part
number: 00198). Otherwise, capillary action can result in water ingress into the
housing and damage the electronics. Such damage is therefore excluded from the
warranty! The antenna housing must always be mounted with the BNC socket facing
down!
Active Antenna Connection Scheme
Important Information:
•
Inappropriate/incorrect use, modifications, damaged or removed seals
odifications to the device, damaging any product warranty seals, barcodes, warnings or other stickers
will void the warranty and the right to return the product to the manufacturer.
•
Power Supplies
Ensure that the voltage and polarity of the power supply are correct. For interference-free operation, do
not use a switch-mode power supply.
CAUTION: in extreme cases, simple unregulated transformer power supplies can deliver up to 1.4
times that of the stated output voltage. Therefore, wherever possible, use regulated analogue power
supplies.
Operating principle
The MegActiv MA305FT is an active antenna with a maximum limit frequency of 300MHz, which responds
to the electrical component (E-field) of the electromagnetic field.
It has a very consistent, broadband frequency response in combination with vertically polarized all-round
reception characteristics and achieves good intermodulation values with low power consumption.
The power supply can be via an AC adapter or alternatively via optional USB > DC power adapter PartNo:
00163-1 via USB (eg USB Power Bank). This makes it ideal for portable use.
Switchable FM-Bandstop-Filter
Jumper FM trap (on /off).
For attenuation of nearby
strong FM transmitters.
Default: Off
Example for the outdoor installation
The installation of the antenna should ideally take place
outdoors, away from domestic electromagnetic noise.
Therefore, the antenna should be sited typically 5 to 10
meters distant from any building.
Coaxial power inserter
The antenna electronics are powered via the connected
coaxial cable of the power inserter. Power is supplied by
the power inserter (CPI1500UNI) which can be fed by
an external power supply. Whenever possible, do not
use a switch mode power supply; it is always preferable
to use a transformer.
Power can also be supplied via USB with the optional
USB > DC power plug PartNo: 00163-1. Do not use different
power supplies simultaneously! A self-resetting fuse will
limit the power input to 400mA in case of a short circuit.
The power inserter has two LED-status indicators:
Green (PWR): Operating voltage display
Red (!): Short-circuit or overload indicator
Inside the antenna housing there is a jumper for
switching on an FM band-stop, if the MA305FT is
to be operated in the vicinity of an FM transmitter.
The FM band-stop attenuates the FM range (88-
108MHz) by typically 20dB and thus prevents clipping
or overload effects and interference.
Contrary to widely held opinion, the highest possible
installation location is not always the best. Better near
the ground, mount on a mast that is 2m high. This
means that the antenna is less exposed to the risk
of lightning and at the same time cable resonance
effects are avoided.
The coax cable used should have the highest
possible attenuation. We recommend the coax cable
types Hyperflex 5 (Messi&Paoloni) or H155 (Belden).
When using a metallic antenna mast, the coaxial
shielding should also be grounded near the antenna.
Inconspicuous
installation for
vertically polarized
omni-directional
reception.
Attention:
If the red LED illuminates, disconnect the antenna and
power cables from the power inserter and investigate
the cause of the short circuit or overload!!
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