Meinberg DOAL - Manual (Page 4)

Features of DOAL
DOAL is a DCF77 Optical Antenna Link set for connecting a Meinberg DCF77
antenna to a Meinberg DCF receiver via an optical fiber. The module DOAL/R is to
connect to the receivers antenna input via a patch cable and can be assembled
somewhere around. The module DOAL/A is to mount indoor, connected to the
Meinberg DCF antenna (AI01, AW02 or AK03) via a coaxial cable. Both modules are
linked to each other via a GI50/125µm or GI62,5/125µm multimode gradient fiber. This
kind of connection provides several advantages:
- large antenna cable distances (up to 2000 mtrs.)
- no destructive overvoltage via the antenna cable
- no unintentional monitoring via optical fiber
The receiver-side module DOAL/R is supplied with power via the antenna input
connector of the DCF radio clock, therefore no external power supply is necessary. The
module DOAL/A needs an external supply for operating and feeding the connected
DCF77 antenna. The DOAL system is suitable for all Meinberg DCF77 radio clocks,
even upgrading existing installations is possible, also for the correlation receivers
PZF5xx.
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