WSPRLite SB скачать в хорошем качестве

WSPRLite SB

Wondering how well your antenna works? WSPRlite will tell you... The WSPRlite is a special test transmitter that sends a signal to a Worldwide network of receiving stations. When used with our web-based DXplorer system, it's a powerful new way to evaluate antenna performance. Going way beyond antenna modelling or antenna analyzers, this unique system allows you to see how your antenna is performing in its actual location and in real-time! This type of analysis has never been possible before. WSPR, or Weak Signal Propagation Reporter Network is a group of amateur radio operators using K1JT's MEPT_JT digital mode to probe radio frequency propagation conditions using very low power (QRP/QRPp) transmissions. WSPR implements a protocol designed for probing potential propagation paths with low-power transmissions. Transmissions carry a station's callsign, Maidenhead grid locator, and transmitter power in dBm. The program can decode signals with S/N as low as -28 dB in a 2500 Hz bandwidth. Stations with internet access can automatically upload their reception reports to a central database called WSPRnet, which includes a mapping facility Links- http://wsprnet.org/drupal/ https://www.sotabeams.co.uk/wsprlite-... Specifications: Standard message: callsign + 4-digit locator + dBm (e.g., K1ABC FN20 37) Messages with a compound callsign and/or 6-digit locator use a two-transmission sequence. The first transmission carries compound callsign and power level, or standard callsign, 4-digit locator, and power level; the second transmission carries a hashed callsign, 6-digit locator, and power level. Add-on prefixes can be up to three alphanumeric characters; add-on suffixes can be a single letter or one or two digits. Standard message components after lossless compression: 28 bits for callsign, 15 for locator, 7 for power level, 50 bits total. Forward error correction (FEC): non-recursive convolutional code with constraint length K=32, rate r=1/2. Number of binary channel symbols: nsym = (50+K-1) * 2 = 162.[2] Keying rate: 12000/8192 = 1.4648 baud. Modulation: continuous phase 4-FSK, tone separation 1.4648 Hz. Occupied bandwidth: about 6Hz Synchronization: 162-bit pseudo-random sync vector. Data structure: each channel symbol conveys one sync bit (LSB) and one data bit (MSB). Duration of transmission: 162 * 8192/12000 = 110.6 s. Transmissions nominally start one second into an even UTC minute: e.g., at hh:00:01, hh:02:01, etc. Minimum S/N for reception: around –28 dB on the WSJT scale (2500Hz reference bandwidth). This channel is supported through our exclusive Amazon Influencer Page: https://www.amazon.com/shop/theradioh... #hamradio #SWL #scanning #hamradio #shortwave