These band filters are based on 3 or 5 sections Butterworth band pass filters, maintaining 50 Ohm impedance, and when built around toroidal inductors, can be made very compact.
This device was designed as an SWR and power meter for Radio Amateurs. In addition to SWR, it measures forward and backwards power, therefore can also be used as a wattmeter. With a large measuring range from 1 to 1000 watts, it is suitable for use from QRP to QRO
Free PDF book to start learning morse code and to improve your proficiency, freely available in four languages english, german french and italian.
CW Morse Nano QRP and Micro Keys. CW Morse PCB Keys. Morse Keyers
This guide offers advice on improving proficiency in Morse code for those already using CW.Chapters include, Speed, Timing, Pitch, Swings and fists, Sending and copying better CW.
Recommendation M.1677-1 (10/2009), General transmission rules, Morse code, signals, spacing and length of the signals.