DOAL: DCF77 Optical Antenna Link

Key Features

Large antenna cable distances (up to 2,000 mtrs.)
No destructive overvoltage via the antenna cable
No unintentional monitoring possible via optical fiber

Product Description

The DOAL system is suitable for all Meinberg DCF receivers, and can be retrofit to existing Meinberg DCF77 systems. The DOAL/A antenna module requires an external power supply to operate the DCF77 antenna. The DOAL/R receiver module is powered by the DCF receiver and does not require an external power supply.

Both modules are linked to each other via a GI50/125 μm or GI62,5/125 μm multimode gradient fiber. This kind of connection provides several advantages:

large antenna cable distances (up to 2,000 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 PZF correlation receivers.

Characteristics

Type of Antenna	Input for a Meinberg DCF77 antenna (77,5 kHz) via coaxial cable
Optical Outputs	ST connector for GI 50/125 µm or GI 62,5/125 µm gradient fibre, wave length: 850 nm, launchable optical output power: typ. 15 µW (into GI 62,5/125 µm), optical input level: min. 3 µW
Electrical Connectors	Optical ST connector Female BNC Power Supply (DOAL/A only)
Operating Voltage	DOAL/A: 100 - 240 V AC (50/60 Hz) / 110 - 240 V DC optional: 20 - 60 V DC power consumption: 5 W max.
Form Factor	DOAL/A: black eloxadized aluminium housing, with aluminium front and rear panel DOAL/R: aluminium HF housing protection class: IP30
Physical Dimensions	DOAL/A: 44 mm x 105 mm x 165 mm (height x width x depth) DOAL/R: 25 mm x 25 mm x 95 mm (height x width x depth)
Supported Temperature	-25 ... 65° C
Supported Humidity	Max. 85 % (non-condensing) at 40 °C
Warranty	Three-year warranty
RoHS Status of Product	This product is fully RoHS-compliant.
WEEE Status of Product	This product is handled as a B2B (Business to Business) category product. To ensure that the product is disposed of in a WEEE-compliant fashion, it can be returned to the manufacturer. Any transportation expenses for returning this product (at end-of-life) must be covered by the end user, while Meinberg will bear the costs for the waste disposal itself.