Driving a non-class A amplifier is complicated. For one thing, the input impedance varies significantly with supply voltage and drive/power level, and to some extent the output tuning........ 2:1 VSWR

HP/Agilent/Keysight still have the best application notes on network analysis and spectrum analysis, both for beginners and for others who want to dig in further. I still have paper copies of many of

Please consider the SAA-2N analyzer for your father. The type N connectors and steel case are sturdy and the cables and calibration standards are of high quality. It has a 4" screen. The SMA connector

The SAA-2N also has more-rugged type N connectors and steel case, and the supplied cables and calibration standards seem well-made and sturdy. I have it and two other nanoVNA versions and the SAA-2N i

One of these was the "Clarke Calculator" invented by Edith Clarke: https://spectrum.ieee.org/edith-clarke-modern-power-distribution She also designed the turbine system for the Hoover Dam. 73, Don NVG

It appears to be going away: "March, 5, 2024; Important notice: The lifetime of ARTA development has come to an end. After more than twenty years of ARTA software development I decided to stop develop

There was an article in Jan/Feb 2024 QEX describing using a spectrum analyzer with tracking generator and two mixers, which is essentially the scheme I described above. They used a 30 to 31MHz sweep a

Only if the PC sound card provides phase information. I do not know whether or not they do. 73, Don N2VGU

I have seen articles describing ham use of, and there are commercial versions of, UPconverter/DOWNconverter products for using low(er)-frequency VNAs to measure higher-frequency and even waveguide com

ODD half-wavelengths of ANY impedance transmission line will repeat the impedance presented at the far end. It is not confined to RG-58 or to 50Ω line. 73, Don N2VGU

For a 20dB attenuator, none. 73, Don N2VGU

They have internal metal shields on the PCB assemblies. 73, Don N2VGU

The SAA-2N, which I have and recommend, is in a steel case with 4 inch display and with type N connectors, and the test cables and calibration standards are also type N. The cables and standards are r

I have a similar item and have been pleasantly surprised at how closely its readings track with my calibrated 5-1/2 digit DMM. I use it a lot when I can't justify dragging out my 400W electronic load.

It can also, with the aid of some slotted panels, demonstrate polarization effects. 73, Don N2VGU

You can spend $14.27 single quantity at Minicircuits https://www.minicircuits.com/WebStore/dashboard.html?model=ANNE-50%2B and know that it is of good quality, 30dB return loss (1.065:1) up to 4GHz, r

Apparently so does asphalt: "The moisture content of the asphalt mixture in asphalt pavement undergoes dynamic changes, affecting the pavement’s relative humidity (RH). This alteration in RH has a dir

This is also a good opportunity for ESD damage to occur if precautions are not taken. 73, Don N2VGU

Copper Mountain software is specific to Copper Mountain analyzers. You can run it in "demo" mode with imaginary hardware, but that's about it. I use nanoVNA app or nanoVNAsaver, they have different fe

Do a quick Web search on "nanovna beginner's guide" and what do you know....numerous both written and video beginner's guides. I like what you did with that case. Those UHF connectors are going to lim