Non-contact body temperature measurement – COVID prophylaxis

The LB-669 thermometric gate is used for non-contact measurement of human body temperature, which allows for the detection of people potentially infected with the COVID-19 coronavirus. This stationary medical wall thermometer is fast, hygienic and safe as the measurement is non-contact, maintenance-free and automatic. The result of the measurement with a comment is read out […]

DMR communication in VOT

DMR (Digital Mobile Radio) is an intensely developing future-oriented amateur FM communication system in 2m and 70cm bands, with unlimited range, in which digital radios cooperate with digital repeaters linked by internet connections controlled by a servers system. Thanks to this, theoretically, if our radio is properly programmed with information about DMR network configuration, we […]

SO4M contesting

For many years I have the pleasure to work with Mirek SP4MPG and compete in his contest station located near Olsztyn. I met Mirek thanks to the SN0HQ Team and joint, annual starts in the IARU HF competition. This year, on the last weekend of May, I decided to start in the CW part of […]

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 […]

HF5WIM in 2020 SPDX Contest

Congratulations to all my colleagues for great achievements in SPDX 2020! Particularly touching is the photo of Kamil SQ5JRN (I also heard him) with a baby on his lap 🙂 My story: Saturday, getting closer to the contest. I walk around the garden and look at my wires and 2 element beam. I wonder in […]

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 […]

90th Anniversary of the Polish Amateur Radio Union

On February 22-24, 1930, the congress and the first general meeting of the Polish Amateur Radio Union took place in Warsaw. In 2020, we proudly celebrate the 90th anniversary of this event.             Tomek SP5CCC has released for the purpose of celebrating this event a number of historical photos from […]


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 […]

HackRF with PortaPack – Educational SDR Transceiver for 1 MHz to 6 GHz band

Chinese manufacturers have recently specialized in providing interesting and cheap radio toys, which are clones of open-source projects. An example, next to the recently popular NanoVNA analyzer, is the HackRF micro-transceiver offered with the PortaPack panel, which allows you to conduct various radio experiments. HackRF is a SDR (Software Defined Radio) module that contains transceiver […]

RF level meters with AD8318

It is not necessary to justify how important a radio signal meter is for a radioamateur, especially when entering the frequency ranges above 1 GHz. There are inexpensive meters available on the market (EXAMPLE), but you can do better by yourself 😉 using an inexpensive module with the Analog Device AD8318 IC. The schematic is […]