Amateur telemetry reception from ARTSAT2 interplanet probes: DESPATCH and Shin-en2. Authors: Piotr SP5ULN, Michał SQ5KTM, Piotr SP5MG, Łukasz SQ5RWU. Introduction Bands above 50MHz are often treated only as local FM communication channels. Here and there in the radioamateur environment, the opinion is repeated that in this frequency domain nothing particularly interesting is happening, excluding only […]
Electret microphone instead of dynamic and vice versa
Some transceivers have a microphone input adapted to the electret microphone and some to a dynamic one. It is not possible to replace them due to design differences. The electret microphone contains a FET transistor in the capsule, which must be supplied with DC voltage in the same wire as the audio signal. The FT-991 […]
Is there anything interesting above 100 MHz ?
On February 15, 2019, in the HF5L club we hosted Piotr SP5ULN, who won the first prize for the largest number of received frames from the PW-SAT2 satellite. Piotr gave a presentation on “Is there anything interesting above 100 MHz?”. The main part of the presentation was devoted to the description of the actions that […]
QSL cards sent and received
QSL cards are always a nice surprise, sometimes a surprising content, often an attractive graphic form, a beautiful photo, a reminder of historical events, or advertising … But always QSL cards are welcome! Here is our last selected collection: Our current QSL card: Here’s what is more interesting QSL received:
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
Updated: 2019-01-27 In the HF5L Club on 19 January 2019 took place a meeting with the representatives of the constructors of the Polish student satellite PW-SAT2: Piotr Kuligowski SQ4NOW and Kamil Sażyński SQ5JRN. Piotr has presented many interesting technical, electronic, organizational details and the history of the creation of the PW-SAT2 satellite mission. The meeting […]
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 […]