Author: ms

HF5L Remote

The HF5L station has been adapted for remote access via an internet connection. HF5L Remote is initially intended for standard contacts in the 3.5 and 7 MHz bands. HF5L Remote is currently a 100 W low-power station. It is equipped with a Yaesu FT-897 transceiver with an external AT-897 antenna box, as well as a […]

SP9VFD antenna system for EME

EME communications have fascinated Rafał SP9VFD from the very beginning of his amateur radio hobby, ie since 1991, when he received the first license at the age of 15. At the time, his favorite reading was UHF guide  “Poradnik Ultrakrótkofalowca”  by SP6LB. However, it was only in 2007 that he managed to carry out the […]

Our satellite activity

After a series of meetings on VHF subjects in our HF5L club, we started to prepare for work through amateur satellites. March 8, 2019 Piotr SQ5JUP made the first contact from home QTH via FOX-1D satellite (AO-92) on FM using the X300 antenna + duplexer MX-72A + IC-9100. As you can see, you can do […]

GNI-r5 controller for RAU, RAK, BIG-RAK and RAEL rotators

Rotary antenna rotator controller. A new model of the GNI-r5 antenna rotator controller is available. Compared to previous versions, it has new features and a new steel casing. The following is the shorted operating manual for the GNI-r5 antenna rotor controller.           Introduction. The GNI-r5 controller supports one rotor with pulse […]

DX from space

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 […]

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 […]

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 […]