Radioberry output power to full blast

[Samuel Lourenço]

Hi,

After the last Raspi OS update I was forced to update the driver, since the output power got somewhat lower. However, right after the Radioberry driver update, the output power went full blast, as in pedal to the metal, pegged at 23 dBm. The tune drive and PA settings are ignored, and the issue persisted after updating piHPSDR as well.

I recall that the PA settings were glitchy, because the power would back down after certain points. Now it is pegged to the max, beyond it was able before. The Tx output is connected to my 10 W amplifier from 60 dBm, which accepts 0 dBm, and thus I'm using a 20 dB attenuator. I assume that some IAMP setting was unlocked, but it is not healthy for the Radioberry nor for the amplifier, and the latter can go to 25 W momentarily when tuning, which is not great.

By the way, on a slightly different topic, I'm in the process of building a 1.2 W amp for the Radioberry, and I'm designing it to accept 12 dBm, and gain is set to roughtly 9 V/V, so as to output 31 dBm. My rationale for such high gain is that it provides more flexibility, enabling compatibility with many versions of software and hardware, and excessive gain can always be removed by the use of attenuators or in software. However, it would be essential for this to be ironed out. The output power should be limited to 10 W, and the tuning power even less so.

I need help, and by the way, the current script for piHPSDR installation does not compile, so I'm still using the old script.

Kind regards, Samuel Lourenço

[Yado-san]

Hi  Samuel,

Please try applying the RB2-RPi5 firmware modification to the RPi4 as well.
-> following in Radioberry-2.x/SBC/rpi-4/device_driver/firmware/radioberry.c:

  before:
  467  uint32_t command_data = commands[command & 0xFE];

  after:
  467  uint32_t command_data = commands[command];
       if ((command & 0xFE) == 0x14) command_data = commands[command & 0xFE];
       else command_data = commands[command];

This improved the issue during RB2-RPi5-pio testing where the output does not change correctly when the DRIVE value is changed during TX(Tune).
hope will be back to normal.

Yado-san, jg1twp

2025年12月15日月曜日 17:59:18 UTC+9 Samuel Lourenço: