Paul Dobosz

You made the assumption that the characteristic impedance of the RF output is 50 Ohms which is incorrect.  The plate of the 50C5 Oscillator from which the RF is capacitively coupled to the antenna terminal via a 470pf ceramic capacitor has a much higher impedance.  The coupling capacitor alone puts the impedance somewhere north of 200 Ohms at t…[Read more]

The FCC has an online frequency search tool for LPFM that looks for channels for the licensed Low Power FM service.   The search tool would also be useful for those looking for a frequency for a Part 15 station that would have minimal strong co-channel and adjacent channel signals based on location.

Here is a link to the FCC search t…[Read more]

My posting about the Dayton Hamvention was made several weeks ago (before the show) unfortunately it sat in limbo until a couple of days ago when it finally posted to the forum.

ISS has announced that they will have the new iAM antenna and tuner (now called Range Extender 2.5) on display at their booth at the Dayton Hamvention in Xenia, OH this coming weekend.