Learning about the NanoVNA, I found that testing amplifiers without any attenuators resulted in terrible resutls. Because I want to test my amplifier designs using the NanoVNA, I made some simple 50 ohm attenuators.

Attenuators

I designed two attenuators, one set for 10dB attenuation and the other for 20dB attenuation. The values for components were calculated using my Etoolbox website, which has a resistor attenuator network calculator.

The 10dB attenuator was measured to have an attenuation of about 9.9dB.

The 20dB attenuator was measured to have an attenuation of 19.2dB.

Result

The attenuators functioned great and had input and output impedances close to 50 ohms, within less than 1 ohm error.