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A Radio Amateur in Kyiv This is the story of Volodymyr Gurtovy. An Ukraine lawyer and radio amateur. It is a brutal honest story of a man who first needs to flee Crimea after the Russian occupation in 2014. Now he get’s separated from his family after the Russian invasion in Ukraine in 2022. […] 
Use REAL audio to simulate your filters in LTSpice. Two examples are given. A two stage elliptical SSB filter is evaluated. And a two-stage multiple feedback CW filter is tested. Both are ready to include in your receiver. […] 
Updated : January 25th; Input amplifierUpdated : January 26th; Audio filter A couple of days ago I found the circuit of 20m DC PSK31 receiver at the website of va3iul. The website of va3iul is probably well known in the radio amateur community. It features 100’s of circuit design ideas on all kind […] 
Numeric keypad for radio control […] 
A universal low pass filter that can easily customized, uses easy to obtain parts and has low power consumption. […] |
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