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10.4.
MD-AA Active Antenna for FMD15, 20, 50 and 55
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 tubula
r
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
Weight: approx. 400 gr.
Temperature range: -25°C to +55°C
Tubular mounting
19 to 26 mm
Ordering information:
MD-AA Antenna incl. holder
And N-plug for RG58/U
Voltage feed
AA-PS: (optional)
50


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