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 of receiver quality. 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 […]
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 […]
World Amateur Radio Day
Every April 18, radio amateurs worldwide take to the airwaves in celebration of World Amateur Radio Day. It was on this day in 1925 that the International Amateur Radio Union was formed in Paris. Amateur Radio experimenters were the first to discover that the short wave spectrum – far from being a wasteland – could […]
LB-518 Wireless BLE Temperature & Humidity Logger
LB-518 BLE-LOGGER thermohygrometer is a wireless relative humidity and temperature mini recorder. The logger is equipped with a BLE wireless radio interface. It is powered by an internal exchangeable 3 V battery. For the temperature and humidity measurements, the thermohygrometer uses an integrated, high-quality humidity and temperature sensors. The LB-518 thermohygrometer features an extensive memory […]
Rotator Controller Interface for YAESU G-800DXA, G-1000DXA, G-2800DXA, G-5500
Updated: 2018-08-31. The USB-232B interface allows connection of the YAESU rotator controllers to a PC via the USB port. The interface supports various types of YAESU rotator controllers: G-800DXA, G-1000DXA, G-2800DXA and G-5500. The interface works with many HAM logging programs, for example N1MM, DXLab, HRDRotator, HRDSatTrack, also allowing satellite tracking, using the improved RC5-3 […]
Wireless and automatic antenna switching
Automatic antenna switching – good. Wireless antenna switching – even better. But automatic and wireless antenna switching is just that! As I did for the FT-991, it shows the circuit diagram below. The controller is connected to the TUN/LIN socket and is supplied from it (warning! ABCD signals encoding the band are available on the […]
LB-575 Climate Meter: thermometer, hygrometer, barometer,
LB-575 thermohygrobarometer is a portable instrument with battery power supply. The meter may function as well as a recorder. The measurement history may be viewed on the display. It features an alarm signalling function — when a set measurement threshold is exceeded, a sound and display signal is triggered. Measurement results may be frozen on […]
Power over coaxial cable
If a DC power supply is needed near the antennas, the use of a coaxial cable for this purpose avoids pulling the additional cable to the roof or mast. The diagram below shows the DC power inserter – Power over Coaxial (PoC) solution tested by SP5GNI. Coupling capacitors should allow the transfer of relatively high […]