2-Element-Yagis for HFupdatedpop
- 2-Element parasitic Yagis for the Shortwave-Bands 10-12-15-17-20-30m. The antennas are feeded with the DK7ZB-match. A quarter-wave choke of coax is grounded at the socket.
- The HB9CV-Beam is a 2-Element-Yagi with two driven elements and was introduced by Rudolf Baumgartner, HB9CV in the 1950ies. The Beam is a coax-feeded version of the ZL-Special
Construction by DK7ZB for 2m, 6m and 10m
50MHz Power Splitters
- Splitting an antenna between two receivers or
in use as the phasing harness in stacked antennas where there is a need to equally split the power from the transmitter between two antennas
Near-Real-Time F2-Layer Critical Frequency Map
- This map can be used to determine the frequencies that will always be returned to the Earth. Transmitted frequencies higher than the indicated contours (which are given in MHz) may penetrate the ionosphere, resulting in lost power to space.
The map shows the radio auroral zones as green bands near the northern and southern poles.