. . "Dru\u017Eicov\u00FD transpond\u00E9r - monitor"@cs . "http://www.urel.feec.vutbr.cz/index.php?page=products" . . "P(EE2.3.20.0007), P(GAP102/10/1853), S, Z(MSM0021630513)" . . "Dru\u017Eicov\u00FD transpond\u00E9r - monitor" . "RIV/00216305:26220/11:PR25473" . . . . . . . . "Dru\u017Eicov\u00FD transpond\u00E9r - monitor"@cs . "U-transponder01" . . . . "Za\u0159\u00EDzen\u00ED se skl\u00E1d\u00E1 z p\u0159ij\u00EDma\u010De ur\u010Den\u00E9ho pro p\u0159\u00EDjem SSB modulovan\u00E9ho sign\u00E1lu v p\u00E1smu 28 MHz a vys\u00EDla\u010De s FM modulac\u00ED v p\u00E1smu 435 MHz. Na vstupu p\u0159ij\u00EDma\u010De je p\u0159edzesilova\u010D LNA, kter\u00FD je nutn\u00FD vzhledem k elektricky kr\u00E1tk\u00E9 p\u0159ij\u00EDmac\u00ED ant\u00E9n\u011B. D\u00E1le je za\u0159azen vstupn\u00ED filtr a sm\u011B\u0161ova\u010D na mezifrekvenci. MF sign\u00E1l je filtrov\u00E1n krystalov\u00FDm filtrem s \u0161\u00ED\u0159kou p\u00E1sma 3 kHz a sm\u011B\u0161ov\u00E1n do z\u00E1kladn\u00EDho p\u00E1sma. Demodulovan\u00FD sign\u00E1l je pou\u017Eit pro AGC a tak\u00E9 pro detekci p\u0159\u00EDtomnosti modulace BPSK31 v sign\u00E1lu. Demodulovan\u00FD sign\u00E1l je nakonec p\u0159iveden na vstup modul\u00E1toru vys\u00EDla\u010De. Vys\u00EDla\u010D pracuje s \u00FAzkop\u00E1smovou modulac\u00ED FM na kmito\u010Dtu cca 435 MHz. V\u00FDstupn\u00ED v\u00FDkon vys\u00EDla\u010De je 27 dBm. Vys\u00EDla\u010D je opat\u0159en senzory nap\u011Bt\u00ED, proudu, teploty a vysokofrekven\u010Dn\u00EDho v\u00FDkonu. Rovn\u011B\u017E je na \u0159\u00EDd\u00EDc\u00EDm mikrokontrol\u00E9ru implementov\u00E1n modul\u00E1tor BPSK31 na subnosn\u00E9 312,5 Hz s bitovou rychlost\u00ED 31,25 bit/s. Na t\u00E9to subnosn\u00E9 jsou p\u0159en\u00E1\u0161ena telemetrick\u00E1 data ze senzor\u016F." . "26220" . . "[9753E6B3D103]" . "Kasal, Miroslav" . "Subjekt: US Naval Academy - Aerospace Engineering Department Smlouva: %22Memorandum of Understanding%22 United States Naval Academy (USNA) Aeronautical Engineering Department Small Satellite Program and the Brno University of Technology (BUT) Faculty of Electrical Engineering and Communication Department of Radio Electronics Experimental Satellite Laboratory 25.02.2003 Rob Niewoehner, Radim\u00EDr Vrba" . . "195517" . . "Satellite transponder - monitor"@en . "V\u00E1gner, Petr" . . . . "RIV/00216305:26220/11:PR25473!RIV13-MSM-26220___" . . "3"^^ . . . "Satellite transponder - monitor"@en . "3"^^ . "Dru\u017Eicov\u00FD transpond\u00E9r - monitor" . . . "Urbanec, Tom\u00E1\u0161" . "Jedn\u00E1 se o experiment\u00E1ln\u00ED za\u0159\u00EDzen\u00ED - ekonomick\u00E9 parametry nejsou vy\u017Eadov\u00E1ny. Hodnota za\u0159\u00EDzen\u00ED je 25 000 USD." . "The device consists of a receiver, which is able to receive SSB modulated narrowband signals in 28 MHz uplink band and a transmitter with FM modulation in UHF downlink frequency band. The receiver includes low noise preamplifier in order to compensate electrically short receive antenna, which must be shorter than quarter of wavelength. The LNA is followed by high quality LC filter for the out of band signal suppression. Then there is first mixer to intermediate frequency followed by a crystal filter, which defines actual bandwidth 3 kHz of monitored HF band. The intermediate frequency amplifier with the gain setting ability for automatic gain control then amplifies the received signal and it is followed by the last mixer, which converts the signals to the audio band. The baseband signal is then splitted into three ways. The first signal is rectified and the obtained DC voltage controls the gain of the intermediate amplifier. The second signal is rectified to get 31.5 Hz frequency from the received signals. This spectral component is a part of the BPSK31 signal modulation which is most frequently used digital mode in the monitored radio-amateur band. After passing through the narrow bandwidth tone decoder, a binary signal carrying information about presence of BPSK31 modulation is obtained. It is monitored by a control microprocessor of transmitter in order to recognize useful signal and switch the power amplifier on. The last signal is directly connected to the transmitter modulation input to modulate the UHF carrier. The transmitter produces FM modulated signal in UHF frequency band. Output RF power of the transmitter is 27 dBm at 435 MHz. A BPSK modulator with data rate 31.25 bit/s on a sub carrier with frequency 312.5 Hz is implemented in order to transmit telemetry data from built-in sensors. Block diagram of the transmitter is depicted in fig. 2. The core of the transmitter is integrated transceiver IC produced by Analog Devices. This solution with minimum"@en . "CubeSat, band monitor, BPSK31, PSAT, transponder"@en . "Za\u0159\u00EDzen\u00ED se skl\u00E1d\u00E1 z p\u0159ij\u00EDma\u010De ur\u010Den\u00E9ho pro p\u0159\u00EDjem SSB modulovan\u00E9ho sign\u00E1lu v p\u00E1smu 28 MHz a vys\u00EDla\u010De s FM modulac\u00ED v p\u00E1smu 435 MHz. Na vstupu p\u0159ij\u00EDma\u010De je p\u0159edzesilova\u010D LNA, kter\u00FD je nutn\u00FD vzhledem k elektricky kr\u00E1tk\u00E9 p\u0159ij\u00EDmac\u00ED ant\u00E9n\u011B. D\u00E1le je za\u0159azen vstupn\u00ED filtr a sm\u011B\u0161ova\u010D na mezifrekvenci. MF sign\u00E1l je filtrov\u00E1n krystalov\u00FDm filtrem s \u0161\u00ED\u0159kou p\u00E1sma 3 kHz a sm\u011B\u0161ov\u00E1n do z\u00E1kladn\u00EDho p\u00E1sma. Demodulovan\u00FD sign\u00E1l je pou\u017Eit pro AGC a tak\u00E9 pro detekci p\u0159\u00EDtomnosti modulace BPSK31 v sign\u00E1lu. Demodulovan\u00FD sign\u00E1l je nakonec p\u0159iveden na vstup modul\u00E1toru vys\u00EDla\u010De. Vys\u00EDla\u010D pracuje s \u00FAzkop\u00E1smovou modulac\u00ED FM na kmito\u010Dtu cca 435 MHz. V\u00FDstupn\u00ED v\u00FDkon vys\u00EDla\u010De je 27 dBm. Vys\u00EDla\u010D je opat\u0159en senzory nap\u011Bt\u00ED, proudu, teploty a vysokofrekven\u010Dn\u00EDho v\u00FDkonu. Rovn\u011B\u017E je na \u0159\u00EDd\u00EDc\u00EDm mikrokontrol\u00E9ru implementov\u00E1n modul\u00E1tor BPSK31 na subnosn\u00E9 312,5 Hz s bitovou rychlost\u00ED 31,25 bit/s. Na t\u00E9to subnosn\u00E9 jsou p\u0159en\u00E1\u0161ena telemetrick\u00E1 data ze senzor\u016F."@cs . . .