KF8OD has some examples of homemade transformers.
Saturday, April 11, 2020
Tuesday, April 7, 2020
Amateur Radio Magazine from the American Radio Relay League - Early Issues
Scanned QST issues covering 191 to 1949.
Saturday, April 4, 2020
RFI Site Survey Using an SDR by NK7Z
NKZ uses an SDR monitor a wideband width over 24 hours to determine possible sources of RFI.
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