On 8th July I observed a fair Sporadic-E opening from Russia. Both OIRT and CCIR band was full of strong signals. I got almost all stations from the capital of Russia – Moscow. The MUF reached over 108MHz.

I took my RTL-SDR dongle to check the OIRT spectrum and I recorded some I/Q samples of top hour IDs at 2.4 MHz bandwidth. Interesting view – look at the latency and deviation. Each Radio Rossii TX has different settings. Read more / Czytaj dalej →

The Sporadic-E is the strongest available propagation mode. An ionized „cloud” acts like a metal reflector, that allows signal to skip over a huge distance. It is possible to receive many stations with just a small portable radio and a telescopic antenna. With better equipment, when the frequency is clear, it is also possible to receive stations that transmit at extremely low power, like 50W, with full RDS and stereo! So, the signal level must be really strong, but how strong? Read more / Czytaj dalej →

February 11, 2015 is a day that will mark itself in history of FMDX. For the first time ever I have experienced a winter tropo with distances over 1000 km including BelgiumNetherlands and Norway. Furthermore, both Dutch and Norwegian signals were persistent at the same time! First signs of propagation appeared on February 10 evening. I heard a weak, but stable 89.3 hr3 from Frankfurt am Main, which is a relatively good beacon for tropo. This was the first distant DX over 800km and it lasted continuously during almost entire tropospheric ducting opening. Other locations from Germany were also audible – some frequent ones like Torfhaus, Kreuzberg, Brocken, but also rare Ederkopf (100.7 WDR4). Read more / Czytaj dalej →

Geminids are one of the most known meteor showers with very high theoretical ZHR rate around 120. Its maximum was calculated to be between 13th and 14th December. This time I took my Körner 19.3 antenna at north-eastern direction for an overnight recording. The results in evening were really encouraging with pings and bursts every few seconds! I added a preamp between XDR-F1HD and antenna and set the squelch few dBs over the noise floor. Tropospheric conditions were rather poor due to a cold front, so the VHF band was quiet and ready for MS reception.  Read more / Czytaj dalej →

XDR-GTK v0.3.1 is out. New features include:

– stereo squelch
– frequency scheduler
– simple RDS logging
– stereo pilot injection estimation
– 1/9kHz steps on LW, 1/9/10kHz on MW, 5/10kHz on SW (using keyboard)
– separate RDS error correction level setting for PS and RT
– improved antenna switching (with selectable RDS data reset)
– automatic connect on startup
– rewritten connection and settings dialog
– fixed bug with memory management in SRCP (StationList)
– other stability improvements Read more / Czytaj dalej →