HF Power-Amplifier MRF101

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This blog video discusses the power amp design of the DIY transceiver. A single MRF101 LDMOS RF power Mosfet delivers up to 80W in the 20m, 40m and 80m band.

Preamplifier design and test

You can not drive the power amplifier (MFR101A ) directly with the output of the AD831 mixer. 10dBm power ist not enough. So I did design a 14dB voltage gain amplifier to get the needed power to fully get the final 50W output from the power amp.

Digital filter experiments on STM32F4

Here are some experiments with a simple first IIR filter implemented on a STM32F4. After some theory the design and implementation is presented. Enjoy!

Active filter experiments

We look at the basic concepts of active filters, design a 2nd order lowpass with TI’s filterdesign tool and then build a filter and measure the filter performance on the lab bench. Maybe you want to watch the introduction to electronics filters first, since I do reference to that video so what.

Introduction on electronic filters

This series of videos give you an overview/introduction on electronic filters. basic introduction to electronics filters analog / passiv filters crystal filters active filters digital filters This first video talks about filter specifications, filter types, basic RC filter discussion and shrot discussion on s-parameters. Here you can find more videos about “electronic filters”:

RF mixers

This video discusses theory, active and passive mixers, simulation with LTSpice and GNU radio. Watch the video here:

Design bandpass and lowpass filter

This is how I did design the bandpass and lowpass filters.

Design a crystal ladder filter

See how I approached the design of a 8 pole crystal ladder filter for SSB @9MHz and with a bandwidth of 2.4 kHz.

Design of the antenna amplifier

Check out how the antenna amplifier got designed, simulated and tested.

Types of Radio Receivers

I did choose to build a super-heterodyne type of receiver. What alternatives do we have?

Introduction Video

Hi all here you find a introduction of the DIY HAM radio transceiver.

DIY HAM radio transceiver

Hi all, I did build my first ham radio transceiver and I thought I let you know how I did it. This might give you ideas about your own HF experiments and give me some feedback from you guys and ideas for new projects. introduction, Types of radio receiver antenna amplifier bandpass and lowpass-filter design […]


Dokumentation DIY Transceiver: Types of transceivers Analog bandpassfilter Crystal filters Digital Filters Mixers_1 Mixers_2 Pre-Amplifier Power-Amplifier Documentation Filter Theory & Design: Introduction to electronic filters Active filters Digital Filters Software: Digital Filter IIR on STM32F4 Discovery with PmodI2S2 Transceiver CPU on STM32F735DK with TouchGFX Schematics: Crystal Filter Board Bandpass Board Mic amplifier and two tone […]