KA7OEI's blog

Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei.com and modulatedlight.org

Friday, June 13, 2025

A 15 (and 10) meter high-pass filter for Field Day

QRM from a transmitter to receivers on lower bands A friend of mine belongs to a club in a town north of me and he was describing an issue...

Wednesday, June 4, 2025

The construction of a hybrid ring combiner: Using the same duplexer, feedline and antenna for two repeaters/links/transmitters

Two transmitters, one antenna There are occasions when it is desirable to combine two transmitters - and receivers - onto a single antenn...

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