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Transmission line transformer design info

By admin 31/07/2024 07/12/2024 Amateur radio, Engineering, HF Linear Amplifiers, RF design

Here are two interesting articles about transmission line transformers. Trasks article gives a very good understanding of the principles.
Trask:

Trask_TLT_Tutorial Download

Semelab:

Push-Pull-Circuits-and-Wideband-Transformers Download

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RF attenuator design calculator from standard resistors

By admin 28/07/2024 28/07/2024 Amateur radio, HF Linear Amplifiers, Linear amplifiers, RF design, SDR

PA1B has made a nice calculator to design RF attenuators from standard resistors. You can select if you want to use 0,25W, 1W, 3W, 5W resistors, how much power in W the attenuator shall handle and the attenuation in dB. https://pa1b-qrp.blogspot.com/p/power-attenuator-calculator.html

Here you can download the Excel file (it is safe to use):

design_calculator_excel_PowerAttenuators_RF Download

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How to tune a T-match antenna tuner

By admin 27/02/2024 27/02/2024 Amateur radio, Antennas, RF design

This article describes how to get the most out of your T-match antenna tuner. If tuned incorrectly, this type of tuner can give a lot of loss and the swr still looks ok from the shack.

Getting-the-most-out-of-your-T-Matchbox Download

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Motorola AN-749

By admin 28/10/2023 28/10/2023 Amateur radio, Linear amplifiers, RF design

Motorola’s AN-749 is a classic app. note that describes the principles of broadband transformers for RF amplifiers. It also covers broadband combiners for RF amplifiers. This is a very relevant app note for amateur radio enthusiasts that want to build their own solid state amplifiers.

AN749 Download