A limiter diode is often used in situations like this. Sometimes a simple hardware solution is best—it relies only on semiconductor physics and not correct software.
Sent from my iPhone > On Nov 9, 2020, at 9:40 PM, Lukas Haase via USRP-users > <[email protected]> wrote: > > I need an output signal of ~32dBm (at 900 MHz). > I have a MiniCircuits ZHL-25W-272+ high power amplifier (25W). > The gain at 900 MHz is ~49.2. > Hi, > > > I would also like to filter out harmonics (USRP as well as PA) with a > VLF-1000+; the max input power is 10W (40dBm), so more than what I want to > obtain (32dBm). > > My approach would be to connect the USRP output to the ZHL-25W-272+ and the > VLF-1000+ filter afterwards. > > Hence, the USRP should output a maximum of 32dBm-49.2dB=-17.2dBm. > > I can achieve this by setting the TX Gain to 0dB and adding a digital backoff > in my samples of ~5.9dB. > > I think this should work but I am little bit concerned about safety if the > software fails for some reason or the wrong program is started accidentially. > The USRP can output up to 22dBm which would destroy the HPA and filter (and > what follows). > > Is there a way to program a power limit in advance? > What is the best/recommended way to handle this situation? > > Thanks, > Luke > > > > > > > > > > > _______________________________________________ > USRP-users mailing list > [email protected] > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com _______________________________________________ USRP-users mailing list [email protected] http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
