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Microsemi AN1819: A 700W Broadband Amplifier Using VRF2944 10/10/2024
Eico 723 reverse engineering 07/10/2024
EFHW compensation, or those little blue capacitors 07/10/2024
Toro MX4250 spindle maintenance 06/10/2024
Transformers and magnetic saturation 05/10/2024
ARRL EFHW (hfkits.com) antenna kit transformer – revised design #1 – part 2 03/10/2024
Currents at a coax to dipole junction 01/10/2024
Fact check: “For an antenna, if it doesn’t resonate, it really doesn’t radiate!” 01/10/2024
nanoVNA – are you fazed by phase? 26/09/2024
A low Insertion VSWR high Zcm Guanella 1:1 balun for HF – coax bend radius 19/09/2024
Return Loss Bridge – Dunsmore’s bridge 17/09/2024
ARRL EFHW (hfkits.com) antenna kit transformer – revised design #1 – part 1 15/09/2024
Jaycar L15 ferrite (LO1238) 10/09/2024
Probing the popular s21 series through impedance measurement using NanoVNA-D v1.2.29 cf NanoVNA-D v1.2.40 07/09/2024
Fox flasher MkII update 9/2024 06/09/2024
ARRL EFHW (hfkits.com) antenna kit transformer – measurement 06/09/2024
DIY UHF short and open circuit terminations 04/09/2024
Probing the popular s21 series through impedance measurement using NanoVNA-D v1.2.29 02/09/2024
Jupyter: one for the toolbox – decompose common mode and differential mode current components 31/08/2024
A simple NanoVNA test of a ferrite core and winding to check its suitability in a 50Ω:xΩ transformer 26/08/2024
Thoughts on the ARRL EFHW antenna kit transformer – improvements? 24/08/2024
Antenna system ReturnLoss minima are interesting 24/08/2024
A quick and simple, but effective test of coax matched line loss 20/08/2024
Is port extension or e-delay a universal solution? 16/08/2024
CMRR and transmitting antennas 11/08/2024
Some useful equivalences of very short very mismatched transmission lines – a practical demonstration 10/08/2024
NanoVNA-H4 radio remote trial #6 – HC-05 Bluetooth matured 10/08/2024
Using your NanoVNA-H4 for Zref other than 50Ω 09/08/2024
Mains (230VAC) DC power supplies for ham radio equipment – AU 08/08/2024
A short comparison of the latest BLHeli_S with SimonK / tgy (~2017) 08/08/2024
Use of port extension or e-delay to measure a dummy load 02/08/2024
Some useful equivalences of very short very mismatched transmission lines 01/08/2024
Common mode choke measurement – length matters #4 25/07/2024
NanoVNA-H4 radio remote trial #5 – NanoVNA enhancement 25/07/2024
Stand alone update of SiK radio firmware 21/07/2024
NanoVNA-H4 radio remote trial #4 – Summary 21/07/2024
NanoVNA-H4 radio remote trial #3 – 3DR radio (SiK) 20/07/2024
NanoVNA-H4 radio remote trial #2 – HC-12 19/07/2024
nanoVNA-H – Deepelec test jig #2 18/07/2024
Common mode choke measurement – length matters #3 16/07/2024
NanoVNA-H4 radio remote trial #1 – HC-05 Bluetooth 13/07/2024
Holzforma / Farmertec G395XP chainsaw – first impressions 12/07/2024
Common mode choke measurement – length matters #2 12/07/2024
Common mode choke measurement – length matters 11/07/2024
Common mode choke measurement – estimating Cse 11/07/2024
Dave Casler’s “why so little loss?”… a fact check! 07/07/2024
Arduino thermometer using DS18B20 and OLED display 28/06/2024
NanoVNA examination of stacked ferrite cores of different mixes – more detail 26/06/2024
Effective measurement of common mode current on a two wire line – a user experience 24/06/2024
Dislord’s NanoVNA-D firmware v1.2.35 includes a facility to apply a correction based on the DC resistance of the LOAD 23/06/2024

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