The Four Metres Website

The Four Metres Website

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    • Aircraft Reflections and Flutter on 4m by Ross G6GVI
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      • IRTS 70MHz Awards by Dave EI3IO
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      • History of 4 m
      • International Frequency Allocations in the International Geophysical Year by Ivan Stauning OZ7IS
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  • Equipment
    • Amplifiers
      • 300w PA Using 3 x RD100HHF1 by Sergey EX8MLE
      • 300w PA using a MRF300AN transistor by Sergey EX8MLE
      • 50w Power Amplifier by Peter SP2DMB
      • Microwave Modules MML 144/100 mods for 4m by Paul PA0OCD
    • Antennas
      • Comparison of commercial 4m verticals by Ian Hogan G6TGO
      • Diamond D-130N on 4m by Marc PA1O
      • Improvements to the YG5-4 antenna by Marcel Pertus F5DQK
    • Beacons
      • 70w 4m Beacon PA by Sergey EX8MLE
      • Beacon Equipment by Bo OZ2M
    • Filters
      • A low pass filter for 70MHz by Alex IK0VAQ
    • Software
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      • FT-847 Modifications by SP2DMB and SP3RNZ
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Serbia gets on 4m

27 September 2020 70mhzadmin

Ratel,  the Serbian telecom regulator, has granted access to the 4m band on 3 July 2020. The allocation is 69,9 MHz to 70,5 MHz.

Germany back on 4 m

23 January 2020 responsible

The German Bundesnetzagentur has granted another period for 4 m operation in Germany than runs until 31 December 2020. The permit is valid for Klass A stations, all modes, max 25 W ERP, horizontal polarization and 12 kHz bandwidth.

300 W PA using 3 x RD100HHF1

15 January 2020 responsible

This PA has been designed by Sergey EX8MLE and uses three Mitsubishi RD100HHF1 FETs. Please see more here.

Bulgaria expanded allocation

1 December 2019 responsible

Bulgaria expanded its allocation on 4 m to cover 69,9 MHz to 70,5 MHz 18 January 2019.

Falklands Islands get access to 4 m

27 November 2019 responsible

Dave, EI3IO, writes that the Falkland Islands Telecoms Regulatory Body has granted access to the 4 m band form 70,0 MHz to 70,5 MHz using a maximum power of 1 kW on a secondary basis since 15 November 2019.

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