It's all about the Software

Liborio, I missed your initial post of a picture of your tuning setup for broadcast FM. Only the ".img" being active led my eyes right past it. That looks like you have no antenna on it. I presume you did not change connectors going to the broadcast band. You should be able to see more than what you see with a paperclip for an antenna.

And, when you applied the 70 MHz change, did you properly reset the Pluto? I presume you did. I believe you have to do a Windows "eject" on the dongle's folder then let it come back for everything to be saved. That's all I can think of at the moment.

{^_^}

G8VLR wrote: Sat Jan 03, 2026 12:02 am Hi Liborio,

The device is capable of operating from 70 MHz to 6 GHz, which includes the standard FM broadcast band of 88–108 MHz, though it requires a firmware modification to unlock this range. By default, the PlutoSDR is limited to a narrower frequency range (e.g., 225 MHz to 3.8 GHz), but this can be expanded using a "hack" that reconfigures the device’s firmware to support the AD9364 RFIC, enabling reception down to 70 MHz.

Hope this helps,

Roger (G8VLR)

Thanks for the reply, Roger.

But, as I said before, I did the frequency extension with Putty, but I noticed that the Pluto doesn't go below 325 MHz?!
At this point, I have a doubt: perhaps I should have first reset the Pluto to its factory settings (v.031)?
I'm using Pluto rev.B with firmware v.031-4-g9ceb-dirty.

I finally did it!
Thanks to everyone who gave me suggestions.

Well done Liborio!