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9.7.
Active Antenna Power Supply
The FMD15 has an integrated feeder for a power supply of 12V
and maximum current consumption of 250mA, for an active
antenna, which means that any interconnected supply units in
the antenna cable are superfluous.
This supply unit is
not activated when leaving the factory,
because when attaching a balun transformer (impedance
matcher), there would be a short circuit burden and other types
of antennæ would have a 12V burden on the coupling.
To activate the power supply for the active antenna:
remove the lid of the unit by unscrewing the six screws on the
rear of the unit. Put in the 5 x 20mm / 500mA tubular glass fuse
which is supplied into the fuse holder next to the main fuse.
ATTENTION:
SHOULD IT BE NECESSARY TO CHANGE THIS FUSE AT ANY TIME,
NEVER USE STRONGER FUSES, AS THIS COULD LEAD TO
DESTRUCTION OF POWER SUPPLY PARTS!!
9.8.
Audio output
The FMD15 does not have a LF amplifier nor integrated speakers.
This means one cannot hear or control acoustically. For every
day use, this is unnecessary with the FMD15, as the signal strength
is displayed. Maximum is twelve arrows but from seven arrows
upwards, the signal is strong enough to be decoded. However
the strength of the signal can be influenced by strong noise ratio
or interfering signals.
Optionally, you can order a shielded cable of about 50cm and a
3.5mm jack, on which there is an LF signal sound of
approximately 1 Vpp, which can be made audible over a
suitable amplifier and speaker.
Fastnet Radio offer a loudspeaker with integrated 12V DC
amplifier, which can be connected simply to the 3.5mm jack.
47


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