Some days I feel like I can’t see the forest for the trees. After submitting my last dual gate MOSFET experiment to the EMRFD group for review, I got a nice note from Henning suggesting that I needed to bypass gate 2 directly. Of course, like a three-year old who has to constantly ask “Why?”,… Read More Dual Gate MOSFET Revelations from W7ZOI
Having determined some basic characteristics of the biasing of the BF998 dual gate MOSFET in a previous experiment, it was now time to look into the gain and AGC performance of the amplifier. A few changes were made to the original circuit to turn it into a proper RF amplifier. Test Equipment Power Meter: M3… Read More Dual Gate MOSFET Investigations – Gain and AGC
While digging around the avrfreaks.net forums, I found this very interesting tidbit in a message from a gentleman who was working on using an AVR microcontroller for SAME decoding. One poster mentioned using the Goertzel Algorithm as a way to perform tone detection on a sampled signal. The algorithm is supposed to be simple enough… Read More The Goertzel Algorithm
I’ve had a large collection of BF998 dual gate MOSFETs sitting around in the junkbox for quite a while now (acquired from KE6F), but I’ve never really known what to do with them. I feel like I own a fairly decent library of QRP/homebrewing literature, but there seems to be very little detailed information on… Read More Dual Gate MOSFET Investigations – Biasing