4 meter tape

The 4-meter band (also known as the 4-m band or 80 MHz range ) is the frequency range from 68 to 87.5 MHz , which is used by operational , BOS radio and the Bundeswehr. Further areas of application are in train radio , in energy supply companies and in forestry . The frequency range is mainly used in frequency modulation (FM).

In the area of the former Soviet Union , part of the 4-meter band was also used as a normal radio band (see OIRT band ).

4 meter amateur band

Countries with 4 meter assignments for amateur radio service. Red: Approved; Blue: experimental

In some countries, small areas in the 4 m band have been released for radio amateurs . Radio amateurs in the United Kingdom and the Netherlands can use the 70 to 70.5 MHz range.

In Germany, broadcasting was permitted from July 2, 2014 to August 31, 2014 in the frequency range 70.0 MHz to 70.030 MHz with a bandwidth of up to 12 kHz, horizontal antenna polarization and a maximum radiated power of 25 W EiRP.

In 2015 there was again a limited transmission license, this time in the range 70.15 to 70.18 MHz with 25 watt ERP. Communication No. 412/2015 was published on April 29, 2015 on the website of the Federal Network Agency and was valid until August 31, 2015.

Since December 19, 2018, broadcasting in the range from 70.150 MHz to 70.200 MHz has been approved again until the end of 2020. This was published in communication no. 414/2018 of December 19 of the Federal Network Agency and extended in 2020 with communication 8/2020. As in the previous permits, stationary operation is only permitted for holders of the class A permit. The transmission power is limited to a maximum of 25 W ERP and the antenna polarization must be horizontal. The bandwidth must not exceed 12 kHz.

The band plan was as follows:

Frequency range	use
70.000-70.050 MHz	Beacons (transmission mode undesirable)
70.050-70.250 MHz	Narrow band modes 70,085 PSK31 Activity Center 70,154 FT8 Activity Center 70,185 Cross Band Activity Center 70,200 SSB / CW calling frequency
70.250-70.300 MHz	All modes of operation 70,260 AM / FM calling frequency
70.300-70.500 MHz	All modes of operation; Channel spacing 12.5 kHz 70,300 RTTY / FAX calling and working frequency 70.3125 digital operating modes 70,325 digital operating modes 70.3375 digital operating modes 70,350 digital operating modes 70.3625 digital operating modes 70,375 FM simplex 70,3875 Internet Voice Gateways 70,400 FM simplex 70.4125 Internet Voice Gateways 70,425 FM simplex 70.4375 digital operating modes 70,450 FM calling frequency 70.4625 digital operating modes 70,475 FM simplex 70.4875 digital modes

4-meter tape Bundeswehr

Frequency range	Channel number 20 kHz	use
72.750-75.130 MHz	600-719 UB	Subband (relay input)
82.550-84.930 MHz	600-719 OB	Upper belt (relay output)

Frequency range	Channel number 25 kHz	use
72.750-75.225 MHz	100-199 UB	Subband (relay input)
82.550-85.025 MHz	100-199 OB	Upper belt (relay output)

In the Bundeswehr, the 4-meter radio is used domestically by non-combat units, for example by the Bundeswehr service centers , paramedics or the Bundeswehr fire brigade . The devices used are modifications of the BOS devices. They have the same device names (FuG-7, FuG-8 etc.), but use different frequencies according to the table above. Since the frequency ranges partially overlap on the 20 kHz devices, the BOS channels are shifted by 5 kHz in the grid.

4 meter BOS tape

Frequency range	Channel number	use
74.215-77.475 MHz	347-510 UB	Subband (relay input)
84.015-87.255 MHz	347-509 OB	Upper belt (relay output)

FuG 8b as a car radio in an NKTW

The frequency spectrum extends from 74.215 to 87.255 MHz, with a division into an upper band and a lower band , analogous to the 2-meter band .

The frequencies are distributed over 164 switchable channels (347-510), of which channels 377 to 396 are operated exclusively in the upper band, and channel 510 (channel for motor vehicle marches) exclusively in the lower band. The frequency offset ( duplex distance) between the upper and lower band is 9.8 MHz here. As a rule, the relay station transmits in the upper band, the vehicles and other units in the lower band. The traffic type two-way traffic is used for use with a relay station, and the traffic type alternating traffic is used for direct connections between two vehicles. Explanation of the different types and forms of radio communication can be found in the article Radiotelephone .

Radios for the 4-meter band are usually permanently installed in the vehicle (FuG 7b - FuG 8a or b), but handheld radios (e.g. FuG 13, FuG 13a, FuG 13b) are also used.

The radio call names in the 4-meter band differ from those in the 2-meter band, for more information see the article on BOS radio .