Radioberry TX output

[SNAIL]

I'm trying to mate PA which requires 0dB input with Radioberry. I did experimental output measurements with 3 different PIHPSDR releases and results are as follows.

Same PI OS, same Radioberry board and software, same TinySA settings to measure output with -30dB attenuator in line, no LPF. All bands measured in CW mode and CW portion of the band.

PIHPSDR 2.5 release 2025-02-03

160           80             40             20            15              10

  -23.1      -24             -23.6        -23.8         -24.5         -25.2

PIHPSDR 2.5 release date 08-27-2025

    -18.2       -18.1          -18.3        -18.5          -19          -19.4

PIHPSDR 2.6   11-2025

     -16.1        -16.1        -15.7          -16           -16.6        -17.4

[Samuel Lourenço]

I confirm that mileage may vary, and by a lot! That also depends on which Radioberry version are you using, and even on the Radioberry driver. I just use a 20 dBm attenuator to feed signal to my amplifier, which accepts 0 dBm with some leeway. Then I just calibrate for the different bands. For the calibration signal, don't use tune from piHPSDR, but use a signal generated by WSJT-X (tune there is OK for calibration). Tune from piHPSDR is not full strength.

Kind regards, Samuel Lourenço

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