▌ TRANSMISSION SETUP AND PROCESS (Version 1.0) — DETAILS:
⇲ The detailed description of the transmission setup and process is given below:
The transmission is an audio package, which includes: the opening and ending audio markers designed to highlight the beginning and the end of the whole transmission, the message separation audio markers designed to highlight the individual message within the transmission and the message audio files. The audio markers are presented in Morse code. The message audio files are presented in both Morse code and speech. The Speech audio files are created using Text-2-Speech (speech application interface). The opening marker is made of Morse code “dots”, the number of dots is equal to the number of messages included in the transmission. The closing marker is made of the same number of Morse code “dashes”. The message separation markers are silence intervals with the duration five times the duration of a dot. The whole transmission audio package can be repeated after a silence interval with the duration ten times the duration of a dot.
Transmission No 1. — audio package:
⇱ We use simple equipment suitable for Amateur METI, which includes: 446 MHz UHF radio frequency transceiver Midland 410 (modified to extend the maximum allowed transmission time), 446 MHz Yagi-Uda-type directional antenna SIRIO WY 400-6N(6 element, with boom length of 1130 mm), Sky-Watcher Telescope N 150 / 750 Explorer BD on NEQ-3 mount.
⇱ Equipment's modification — the transceiver Midland 410 has been configured (programmed) to remove the transmission time limit. The transceiver handsfree set has been modified to serve as a VOX (Voice Operated eXchange) audio cable connecting computer audio output with the transceiver audio input (the transmitting process begins as soon as computer plays and audio file). The transmission frequency is set to 446.00625 MHz (standard channel 1 for PMR446 radio).
⇱ The Sky-Watcher telescope is used for better detection of a target star, which is close to the region of the sky with a selected exoplanet. For convenience, we chose a night with clear skies.
⇱ The antenna is aimed at the target star. We strive to perform the necessary antenna alignment as precise as possible. Due to the nature of equipment, this alignment is rather approximate, however the antenna radiation beam (with the width of no less than 550), covers a wide portion of the sky (to some extent, this should also compensate for the fact that the observed location of a target star, is its physical location at a time in the past, and that the star is moving to a new position during the time that takes the transmitted signal to reach it).
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