DCF77 receiver
This receiver schematic is the front end for a frequency reference receiver. The German DCF77 time server, transmitting at 77.5 kHz, has a long-term accuracy of better than 2 parts in 10^13
Converter 0 – 2 MHz to 10 – 12 MHz
This converter extends my rig to the VLF and ELF ranges. As my rig (FT847) starts at 100 kHz, I’m not able to listen to e.g. DCF77 (77.5 kHz) or SAQ Grimeton (17.2 kHz). The lowest frequency I can receive with this extension is a few kHz, depending on the rig bandwidth selection.
Converter schematic