Second RF2126 module modified

A project log for RF2126 module (amazon) tuning for 2.4GHz

RF2126 module received from Amazon. It did not work for 2.4GHz as announced. So tuning was performed.

Denys Zaikin • 09/08/2023 at 20:30•0 Comments

Notes

The second module was modified with the same modifications. Looks OK.
10dB attenuator at RF2126 module input improves gain flatness, so seems like the signal generator source impedance is not perfectly equal to 50 Ohm. See the log for the second module modification results.

No attenuator at the input, only a 20dB attenuator at the spectrum analyzer input

10dB attenuator at the input of the RF2126 module

Short/long cable comparison

20dB attenuator at the input of the spectrum analyzer.
The cable length is 150mm (Wuerth RG174/U 65503503515303) from the generator to the input of the module.
Comparison between 150mm and approx. 1m (RG174) lengths on the output of the module.
Seems like 1m cable had approx. 1dB of losses.

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