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Ham Radio

This category contains 6 posts

KN0CK HF Upconverting HF SDR Receiver

http://www.kn0ck.com/HF_SDR/ martywittrock@juno.com <align=”left”>The KN0CK HF Upconverting HF SDR Receivers were first introduced in January of 2013 and quickly became a best seller in terms of performance and cost against other RTL-SDRs on the market. With an embedded high performance 120 MHz HF Upconverter and MAR-8 preamplifier, a standard RTL-SDR becomes a remarkable HF Software Defined … Continue reading

Applied RF Electronics by Toni W2AEW

This is a great course. More than hundred videos on RF electronics.

Switching Buck Converter Power Supply with LM2678

nice teaching video!

antike QSL-Karte von 9V1MS

my friend James 9V1YC has sent me a scan of an old QSL card with my today’s call sign 9V1MS. I did some research about Denis Mather G3KAM/9V1MS. He lived at Jalan Jintan, near Orchard Road, right around the corner of the Gleneagles hospital. I found out that he in summer 1970, he had already … Continue reading

S-Stufen und Sendeleistung

  Das S symbolisiert die Signalstärke (d.h. die Feldstärke bzw. die Spannung an einem definierten Widerstand von 50 Ohm) am Empfängereingang und Sie wird in einer S0- bis S9-Teilung dargestellt. Obwohl es theoretisch so gedacht war, ist das S-Meter in der Praxis kein absoluter Signalstärkeindikator, sondern höchstens als relativer Indikator für zwei Signale verwendbar. Allenfalls … Continue reading

Lightning Protection

good example, but not perfect