Short Range Devices

Short Range Devices (SRD; German short-range radio ) are short-range radio Everyman applications for voice or data transmission. The old name in Germany was also low power device ( devices with low transmit power, abbreviation LPD). The radios used have to unequivocally comply with the relevant national regulations, in turn, take the partial with respect to international standards. Compliance with these standards is documented by the distributor by attaching the CE mark. Upon request, he must be able to boast a declaration of conformity for it.

SRDs are available in the following frequency ranges:

Depending on the ambient conditions are with the big pack of cigarettes devices range 0.5 - 2 km possible. The first LPD devices were launched in 1995; have now been overtaken by the PMR devices available since 1999, the radio 446 MHz in the area and can accommodate up to 5 km bridge at similar purchasers' prices and dimensions with more transmit power. Since LPD devices are not initially indistinguishable from PMR devices, one pays most for the approval mark; during PMR devices only carry a four-digit CE number, can be found on the LPD devices in addition a " CEPT LPD -D" before.

LPD devices spark on a common area (ISM), which is also used by other various devices and services, such as medical devices, wireless thermometers, wireless headphones and mobile speed measuring devices (among uP80 ) public authorities. Through this community use the effective range of the LPD devices may decrease again, since no protection against harmful interference is guaranteed. Simultaneously, the frequency range of this ISM band is also allocated to the amateur service as an amateur band.

The Federal Network Agency has published a new general assignment for the so-called " Short Range Devices" (SRD ) on November 24, 2010. The new general allocation is valid until 31 December 2020. The contained in the old allocation shortened deadline set for the 70 -cm area till the end of 2013 - that suggested that this area " expires " - is no longer included in the new general allocation.

Meanwhile, this general allocation was set aside and available with 43/2012 replaced by a new general allocation that takes into account the EU Commission to harmonize frequency usage Implementing Decision by short-range devices on 8 December 2011. The use of the 70 -cm range is now allowed with the previous parameters and without any other restrictions on use until 31 December 2022.

Analog frequencies in the 12.5 kHz channel spacing, narrow band FM ( NFM )

  • Channel 01 .... 446.00625 MHz
  • Channel 02 .... 446.01875 MHz
  • Channel 03 .... 446.03125 MHz
  • Channel 04 .... 446.04375 MHz
  • Channel 05 .... 446.05625 MHz
  • Channel 06 .... 446.06875 MHz
  • Channel 07 .... 446.08125 MHz
  • Channel 08 .... 446.09375 MHz

16 digital frequencies in the 6.25 - kHz channel spacing, digital modulation dPMR standard

  • Channel 01 .... 446.103125 MHz
  • Channel 02 .... 446.109375 MHz
  • Channel 03 .... 446.115625 MHz
  • Channel 04 .... 446.121875 MHz
  • Channel 05 .... 446.128125 MHz
  • Channel 06 .... 446.134375 MHz
  • Channel 07 .... 446.140625 MHz
  • Channel 08 .... 446.146875 MHz
  • Channel 09 .... 446.153125 MHz
  • Channel 10 .... 446.159375 MHz
  • Channel 11 .... 446.165625 MHz
  • Channel 12 .... 446.171875 MHz
  • Channel 13 .... 446.178125 MHz
  • Channel 14 .... 446.184375 MHz
  • Channel 15 .... 446.190625 MHz
  • Channel 16 .... 446.196875 MHz
Personal radio service B-Netz PMR446 ISM-Band Amateur radio Amateur radio frequency allocations Effective radiated power Dedicated short-range communications European Conference of Postal and Telecommunications Administrations
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