Operation Manual

10.4. MD-AA Active Antenna for FMD55, 50 and 20
Description:
The MD-AA active antenna has been specially
developed and tuned for the Fastnet Radio GMDSS
Marine Decoder series FMDxxx, but can also be
used for any other receiver in the above range.
It was mainly designed for the reception of
vertically polarised waves in the long, medium and
short ranges.
Extra value has been placed on a greater spacing
interval between the signal and the interference
level, rather than reaching a higher output
potential. Carefully tuned for this purpose, the
antenna electronics adapt themselves to a low
noise level, vertical linear impedance transformer,
which guarantees the highest possible signal
interference immunity. By using the most modern
shielded circuits, damage, caused by over-voltage,
such as atmospheric or electrostatic lightning, will
generally be ruled out.
The electronics are installed in a shockproof, UV
and oil resistant casing, which optimally protects
them against mechanical or atmospheric damage.
The robust N-connection in the antenna is
weathering resistant.
A fitting coaxial cable (RG214/RG58) serves
simultaneously to branch off reception signals as
well as to supply the distribution voltage.
A universally fitting mount for the installation on
tubular or plain surfaces is standard supply.
The latest versions of FMDs have an integrated
antenna -adapted power supply, which can be
activated on desire.
In this case, only a suitable coaxial cable,
connected to the decoder's antenna input, is
required, making the additional installation of an
antenna power supply unnecessary.
Technical data.
Frequency range: 100kHz to 30MHz
Nom. impedance: 50:
VSWR <2
HF connection: N-socket
Power supply: via HF connection
Voltage: 12V DC (10 - 16V)
Consumption: max. 65mA at 12V
Distortion: 2.Level
E1=E2=0V/m type 75dB
3. level E1=E2=0V/m type 95dB
Dimensions: see sketch
Temperature range: -25°C to +55°C
Ordering information
:
MD-AA Antenna incl. holder
And N-plug for RG58/U
Voltagefeed
AA-PS: (optional)
Tubular
mounting
Ø 19-26mm
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