Category: Designs

QCX transceiver QRP in SSB version

In the post “QCX transceiver QRP CW ” Piotr SQ5JUP described his experience with the QRP Labs mini-transceiver. Below is how to build a QSX SSB from the new QCX+ kit. The contents of the QCX+ kit from QRP-Labs is shown below.               The boards were assembled step […]

Transceiver uSDX with Arduino Nano

Personally, I think that a “real” SDR radio is one where the radio signal is received by the antenna and then (possibly after passing through passive filtering circuits) is sampled by an analog-to-digital converter. Further processing of the signal takes place in the digital domain. However, the SDR category also includes other devices which to […]

Software Defined Radio with Arduino Nano

Arduino is a favorite toy for electronics enthusiasts. There are thousands of designs around these modules. Here’s the next one – the simplest and cheapest SDR receiver in the world! A “real” SDR radio is one where the RF signal received by the antenna is directly sampled by an analog-to-digital converter. Further processing of the […]

The PW-Sat2 satellite completes the mission, preparations for the PW-Sat3 launch are in progress

The PW-Sat2 satellite completes the mission, preparations for the PW-Sat3 launch are in progress Polish student satellite PW-Sat2 tested the sail for deorbitation, took thousands of photos, collected a lot of data. In January / February, it will burn in the atmosphere, ending the mission. In 2023, the PW-Sat3 alternately in orbit, the choice of […]


In the post “ADALM-PLUTO development kit for (not only) Es’hail-2 satellite”, the topic of the 40 MHz clock generator for Adalm-Pluto and 25 MHz for the LNB satellite converter was considered. The problem of the 40 MHz clock generator is somewhat solved by replacing the original micro-module of the generator with a more stable one, […]

Monitor for SG-Lab Power Amplifier

The 2.4 GHz 20W power amplifier from the Bulgarian company SG-Lab is widely used among the OMs (including QO-100 sattelite fans) [1]. In addition to the attractive price, this is also due to the excellent workmanship and delivery in the milled aluminum housing. The PA contains three internal directional couplers for measuring input, output and […]

N7DDC autotuner with power over coaxial cable

I made N7DDC popular ATU-100 antenna tuner in the basic version (5×5) in 2019, and I added my experience with it on our website in the post  CHA-250B antenna by SP5GNI. The original documentation of the ATU-100 tuner can be found on the Github portal as well as elsewhere (example). The schematic diagram can be […]

Mini-PC for transceiver

What do the radio hams miss on their radio shack the most? The most lacking is free space for the next lumber, as in the example in the shack of Mark MW0RKB. One of the ugliest and senseless boxes that are waste of space, make noise and draw a lot of expensive electricity, are PCs […]

HF amplifier with MFR101

In 2018, NXP introduced new MRF101 and MRF300 power transistors to the market. They are designed for medium and high power levels in the radio frequency range, where the offer is not so rich. Why are they extremely interesting to the amateur radio community? – First of all – they are cheap thanks to the […]


The SDR Active Learning Module  ADALM PLUTO from Analog Devices is used by many OM’s for working satellite QO-100. This is due to the attractive price and the excellent SSB-Modulation. No additional up- or down-converter are needed. Nevertheless some optimizations are possible. Installation in an aluminium housing avoiding radio frequency radiation Reducing frequency drift by […]