NDB are low power beacons in the 250 to 550 KHz range. The beacons are usually situated at a landing strip/airfield / oil platform to aid navigation. They are non-directional so use a vertical omnidirectional antenna, and reasonably low power. The ERP is very low, as the physical size of the antenna restricts the efficiency […]
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KiwiSDR 10 kHz to 30 MHz now online.
The SDR is online 24×7 for your enjoyment. If you find the SDR useful consider making a small donation to help with its upkeep. Listen to my SDR KiwiSDR User guide Access other SDRs from around the world. Buy one online. I have put the KiWi back online, but with limited capacity, as it is mostly […]
LF and MF reception in an urban environment
SW listening and the ability to receive stations many thousands of miles away on HF has always fascinated me. Reception on HF, more especially LF and MF has always been a challenge due to the high urban noise floor. The doublet antenna at home while working well on 7 to 30 MHz, is a poor […]
472 kHz reception on WSPR
Having played around with the Wellbrook loop on 7 MHz the other evening I decided to try some 472 kHz reception on WSPR. I had never tried 472 kHz before, as the combination of local noise and poor antenna has always put me off. The Elad FDM-DUO seems quite sensitive down to 100 kHz (the […]