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 […]
The good old days – history of SP5KOH, SP5ZHM, SP5KTD radio clubs
>>>>>Updated on 2019-06-18 by SP5GNI<<<<< The HF5L amateur club refers to the legacy of SP5KOH, SP5ZHM, SP5KTD radio clubs that have not existed for many years, as well as SP5ZDF, SP5ZCA. Established in 2017, the HF5L club is a meeting place for former members of those clubs, but also a place for new people interested […]
Wireless antenna switching
Automatic antenna switching is a convenience and safer operation of the equipment, but it does not solve all the nuisances. If the antenna switch is located in the radio room, then a separate fider should be derived from each antenna, which does not have a very favorable effect on costs and aesthetics (not to mention […]
LB-524 GSM Microclimate Recorder
The LB-524 GSM Microclimate Recorder is a small, wireless, portable, battery device used to control the conditions prevailing in storage rooms, production facilities or vehicles in which products are sensitive to changes in the microclimate conditions. The recorder measures and records in memory: temperature, relative humidity, air pressure and illuminance. Every established period, the LB-524 […]
Automatic antenna switching in Yaesu transceivers
Automatic antenna switching is not only convenience, but also safer operation of the equipment. Yeasu transceivers are equipped with a socket on which BCD signals represent the currently selected band. The truth table for the TUN/LIN connector in FT-991 is below: D (pin 7) C (pin 6) B (pin 5) A (pin 4) Dec value […]
What is Hamsphere
The Hamsphere program is celebrating its 10th anniversary. Its originator and owner, Kelly (SM7NHC and 5B4IT), claims that it is not a typical “talk”, VOIP which are already several on the Internet, but a real radio program for hams, only in the Internet, with all the attributes of a real radio . We have there […]
HF5L/p in IARU CW R1 Fieldday 2018 contest
Updated on 2019-06-18 by SP5GNI Field work of ham radio is an attractive form of action within our hobby. For stations slashed by “p” and “m”, the Fieldday competition formula assumes a number of restrictions, such as non-stationary work without using mains power, distance from the nearest buildings and power lines greater than 100 m, […]
Los 2018 – Ham Radio Fest Poland
Several pictures from the XII Ham Radio Fest which took place at Papierkowa Gora in Jaworzno (in the commune of Rudniki, Poland) at the meeting point of three province: Lodzkie, Opolskie and Slaskie (LOS) in May 2018:
Fieldday 2018 preparations
On 2-3 June 2018 we will operate from a forest near Skierniewice, Poland, under the callsign HF5L/p. On May 19 there was a general rehearsal before leaving at the headquarters of the HF5L club. We invite everyone to participate in the competition and for QSOs with HF5L/p on all 6 bands! Rules of the 2018 […]