The Great Orchestra of Christams Charity transmits from the stratosphere

Colleagues associated in SP6ZWR and SP5MASR to celebrate the 27th edition of the Great Orchestra of Christmas Charity released amateur radio balloons with SSTV, RTTY and APRS transmitters for the 2 m and 70 cm bands. Using the FT-991, the MA-1300 omni-directional antenna and the MMSSTV program, I managed to pick up several pictures. The […]

Meeting with representatives of the designers of the Polish student satellite PW-SAT2

The HF5L club invite for a meeting with representatives of the designers of the Polish student satellite PW-SAT2: Piotr Kuligowski SQ4NOW and Kamil Sażyński SQ5JRN. It will be presented interesting technical, electronic, organizational and history details of the PW-SAT2 satellite mission. The meeting will take place on Saturday, January 19, 2019 at 12:00 in the […]

Polish student satellite PW-SAT2 transmits

We live in interesting times. In orbit is the Polish student satellite PW-SAT2 which broadcasts data in our radio-amateur band of 70cm. The history of the PW-SAT2 project is also described in Wikipedia and on the website of the Student Astronautical Circle. There is also an interesting photo gallery from the implementation of the PW-SAT2 […]

QCX transceiver QRP CW

I have been interested in QRP solutions for a long time. Of course, I do not avoid QRO, which like QRP gives me pleasure. Long time ago I built TRX Libra on the 80-meter range, unfortunately I did not have the desire to fully run it. Now I have found a very interesting and modern […]

CHA-250B antenna by SP5GNI

Based on the best experiences found on the web, I made my own copy of the CHA-250B antenna. This antenna has many controversial opinions. I decided to do it because having a Hex-beam directional antenna and SDR radio – I needed a multi-band antenna with omnidirectional characteristics. In addition to the characteristics, the most important […]

LB-523 WiFi temperature and humidity recorder

Thermo-hygrometer WiFi LB-523 is a wireless recorder of relative humidity and air temperature, equipped with a large memory of measurement data. It is powered by batteries (2 x 1.5V AA), rechargeable batteries (2 x 1.2V AA) or an external 5V USB charger. The recorder is equipped with a USB interface (for configuration) and WiFi, allowing […]

How to measure the performance of the HF receiver?

In the comment to “HF5L Radio Club in SSB Fieldday 2018” Marek SP5IXS rightly pointed out that “third order dynamic range is a key parameter”. He also asked good questions: What is the difference between IP3 and “3rd order dynamic range”? What is the relationship between RX sensitivity and “3rd order dynamic range”? As for […]

SV8/SP5ISZ

September 14, 2018 Marek SP5ISZ announced that he had started up QRP from the island of Milos. He had an ICOM 703 (10W only) with a 7.5 Ah battery, an LW 41m antenna about 6m above the ground, about 50m from the sea on the beach. With a 9: 1 transformer, the antenna has tuned […]

HF5L Radio Club in SSB Fieldday 2018

After a successful escapade on the CW part of the Fieldday competition in June, we organized another trip to take part in the phone part of the contest on September 1-2. This time there was no rain or storm, the weather was for 59! There were many operators willing to work on the SSB: Andrzej […]