AdrianNov 28

A few pics with the signals right at the output of my ADALM-Pluto in the 2390 MHz band, before amplification. In order or appearance: 4FSK, DQPSK, GMSK. I don't normally use the GMSK modem due to it's slightly lower performance, it's just there to spite my D-Star-using friends. Audio payloads are Codec2 and Opus.

The amplification chain has two stages: first to ~16 dBm, second one to ~36 dBm.
@n8dmt

#ADALM-Pluto #SDR #GNURadio #plutosdr #hamradio

Show threadGary @N8DMTNov 27
@yo8rzz I see that there may be some GRC flow diagrams for measuring EVM. Will look into that once a basic radio has been tested. Will be interesting to explore TX back-off vs. TX linearity/EVM for simple digital modulation with the Pluto SDR. Think I can get there from what I’ve seen using GNU Radio Companion behind the Pluto SDR… #HamRadio #PlutoSDR
Show threadGary @N8DMTNov 27
@yo8rzz Thanks for the Q about TX chain linearity. I’m thinking to use a ZFL-1042J amp following the Pluto for a max output of ~ 0.1 W. Initial thought for the radio is SSB or FM where I can run a little closer to 1 dB compression. Agree that Dig TX EVM will suffer if not backing off by ~10 dB from 1 dB point. The ZFL gain will make up for some of the Pluto output level backoff, but another external (linear) gain stage may be needed. Exploring other TX amps for higher power. #HamRadio #PlutoSDR
Show threadGary @N8DMTNov 21
Here is the system drawing showing the local laptop PC with headset and the remote computer & RF equipment group (Raspberry Pi 5, Pluto SDR, and transmit/receive amplifiers and filters leading to the antenna). Ideally, the remote equipment is located VERY CLOSE to the antenna(s) to minimize feed line losses at these higher frequencies. #HamRadio #PlutoSDR
More info at the qsl.net blog.
https://qsl.net/n8dmt/a-pluto-based-sdr-radio-for-vhf-shf-bands/index.html
Gary @N8DMTNov 21
Lower cost & performance, but more bands than the ICOM IC-905? Have been exploring how to inexpensively get on VHF/UHF/SHF bands (2m and up) and believe the ADALM Pluto and RaspberryPi5 with Remote SDR SW will support that. Many challenges to achieve all 8 RF bands to 5.9 GHz, but with purchasing a few items might be able to get there. More info at the qsl.net blog. #HamRadio #PlutoSDR
https://qsl.net/n8dmt/a-pluto-based-sdr-radio-for-vhf-shf-bands/index.html
A Pluto-Based SDR Radio for VHF-SHF Bands

Having discovered F1ATB's Remote SDR package for a Raspberry Pi 5 to remotely control an ADALM Pluto SDR supporting two-way…

N8DMT
Gary @N8DMTNov 6

Getting the lab organized a-bit more: Printed out a data sheet for a pair of Narda RF couplers. Have both couplers back in the same storage package again. What is the RF Geek equivalent of the old hammer-nail saying?

When all you have are RF couplers, everything looks like a return loss measurement…

#HamRadio #TestEquipment #PlutoSDR #SATSAGEN

Show threadGary @N8DMTOct 18
@vk6flab Solar flux measurement/monitoring with an ADALM Pluto SDR. Sounds like a fun project. Learning ahead! Thanks for sharing & 73.
#SolarFlux #PlutoSDR #GRC
Onno (VK6FLAB)Oct 13

#gnuradio #plutosdr

https://youtu.be/9rqR_uWuhsY?si=kmzQkWfRhds93vat

European GNU Radio Days 2019 tutorials: PlutoSDR, Travis Collins (ADI)

YouTube
Onno (VK6FLAB)Aug 20

Sneak peek:

https://youtube.com/@fromconcepttocircuit

#sdr #plutosdr #vna #sa #python

Before you continue to YouTube

Show threadGary @N8DMTJul 9, 2025
@ChuckMcManis Thanks — this is an excellent point. Am still learning how the TinySA-Ultra is different compared to previous SA (Agilent 8561E). Might setup a RF sweeper (continuous) and reverse sweep it against the TinySA-Ultra to see how it behaves with short-presence signals. Have both continuous and stepped sweepers to experiment with. Maybe two sweepers in the scanned band at once? (Have not done that before.) Lots to learn and more RF fun ahead! #SATSAGEN #PlutoSDR #Wavetek2001 #HamRadio