How the W3UJ Station Developed
Follow the station from one FT-991A to two radios, multiple SDRs, and coordinated RF/PTT integration.
Read the guideExplore W3UJ
Station & Projects
Explore the W3UJ station, see how it developed, and choose optional projects after your basic receiver works.
A Separate Antenna for Receiving
Follow the W3UJ 60-foot Loop on Ground build: transformer, feedline, RSPdx-R2, coordinated PTT protection and reception comparisons.
Read the guide
The Portable SDR Project: Inside the Build
Inside the hard-case SDR kit: three build photos, Dell mini PC, one SDR Switch, power compartment, cooling, and deployment.
Read the guideProjects are optional branches, not requirements for completing the learning path.
Practice Using Your SDR → — explore the station paths and try operating exercises in Build & Operate.
Inside the W3UJ Station
The radiosTransmit with the Radio
Transmit with the Radio
Explore with the SDR
The FTDX10 and FT‑991A retain their established transmit paths. The external SDRs provide independent reception and a flexible computer view.
A manual RF selector, an isolated PTT combiner, and SDR switching perform separate jobs. The unused HF radio stays powered off.
Equipment and operating roles ↗
The receivers
HF Through VHF/UHF
The RX888 MkII and RSPdx‑R2 serve primarily HF roles. The RSPduo and NESDR SMArt v5 are assigned primarily to VHF/UHF at this station.
Those are operating assignments, not absolute coverage limits. The receiver, its software, and the computer determine what can be monitored in a particular configuration.
See the SDR Console setup ↗See the equipment working
Station Demonstrations
Original videos linked from the master. Opens YouTube when you choose to watch.