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4417, 4420 , 4437 DCF77 GPS active directional antennas
4417, 4420 , 4437 DCF77 GPS active directional antennas
4417, 4420 , 4437 DCF77 GPS active directional antennas
Hopf DCF77 antenna
Hopf DCF77 antenna

4417, 4420 , 4437 DCF77 GPS active directional antennas

Review (0)
$284.00
Tax Included

DCF77 4417 / 4418 / 4420 / 4436 / 4437 antennas are all German hopf antennas with active directional capability and an electrical design. Ferrite antennas are used for long wave range frequencies to keep the antennas small. The oscillating circuit in the antenna, which is made of a wire ferrite rod and various capacitors, is set up on 77.5 kHz. DCF77 is a standard for transmitting time (hours, minutes and seconds) and date to clocks and timing devices, and it is transmitted to devices with high accuracy by radio (local transmitter).

Quantity :
In Stock 200 Available items

DCF77 Antenna 4417 / 4418 / 4420 / 4436 / 4437

Antenna structure

All hopf antennas are directional active antennas and of the same electrical design. Ferrite antennas are used for the frequencies in the long-wave range to keep the antennas small. The oscillating circuit in the antenna, made of a wired ferrite rod and various capacitors, is tuned to 77.5 kHz.
The features of the oscillating circuit depend mainly on the ferrite rod. Temperature changes influence the permeability of the ferrite rod and thus the mid-frequency of the tuned oscillating circuit for the DCF77 signal.
The output voltage of the oscillating circuit is fed to an amplifier with definite input resistance. Behind the amplifier there is an adaptation to the antenna cable.

Types of antennas

The following types of antennas for the different purposes are available:

FG443600 Indoor antenna

FG441700A Outdoor antenna for the flat roof installation

FG441800A Outdoor antenna for the wall installation

FG442000 Outdoor antenna for the pole installation

FG443700 Outdoor antenna with non-directional reception for mobile operations

Indoor antenna FG443600

This antenna can be used in buildings away from sources of interference for the DCF77-reception. e.g. TVs, monitors, terminals, in-house-LAN, electrical engines etc.

Also the construction of the building has to be taken into consideration. Reinforced concrete buildings and fairing plates attenuate considerably the DCF77-signal and cause a bad signal / noise ratio.

The antenna, which can be turned by 360°, is screwed to a wall bracket made of zinc-coated steel.

Outdoor antennas

Mostly radio controlled clock systems are running with an outdoor antenna. Whereas the surroundings of the indoor antenna can change because of changing technical operations in the rooms, the conditions for the outdoor antenna remain nearly constant.

For rough weather conditions we supply a very robust outdoor antenna. It is housed in a round weatherproof plastic casing. The different antennas differ in their mechanical structure only.

The mechanical construction is made of a sturdy, anodised aluminum or die-cast aluminum designed to withstand strong wind. The antenna cable leaves the casing at the bottom.

HOPF
DCF77 active antennas
200 Items

Data sheet

power supplies feature
single power supply
Time Server Protocol
DCF77

Specific References

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4417, 4420 , 4437 DCF77 GPS active directional antennas
4417, 4420 , 4437 DCF77 GPS active directional antennas

4417, 4420 , 4437 DCF77 GPS active directional antennas

$284.00
Tax Included