May 20, 2013 - 3.7m solid dish with f/D~0.4. > Home made automatic Az/El tracking (http://f5jwf.free.fr/tracking-system.html). > All radio parts inside the TRVT ...
3.7m solid dish with f/D~0.4. Home made automatic Az/El tracking (http://f5jwf.free.fr/tracking-system.html) All radio parts inside the TRVT box located in antenna focal point Powered with +48VDC from the shack Siemens RW1127 TWT and switched mode power supply also in TRVT box Remote Control and Monitoring System (RCMS) based on Detlog allowing measurements of Power out, PSU and temperature Local Oscillator made by DF9NP synthetizer adapted with Modbus interface Modbus serial communication between TRVT and Shack
F5jwf / Ph. Borghini / 20.05.2013
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TRVT Box Description
F5jwf / Ph. Borghini / 20.05.2013
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RW1127 + RWN320 > > > > >
RW1127 X band TWT for TV Radio Link transmission http://f5jwf.free.fr/datasheet_fichiers/Siemens%201987%20TWT%20Databook.pdf RWN320 switched mode power supply http://f5jwf.free.fr/datasheet_fichiers/TWT%20PSU%20rwn320.pdf Tx/Rx input commutation signal present on RWN320 to block tube in Rx RW1127 provide only few watts highly linear but give aroud 50W in saturation for CW Very compact and low cost solution for optimum power in 3cm EME.
F5jwf / Ph. Borghini / 20.05.2013
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Wave guide switch sequencer > > > > > >
Home made design SEQ876 (http://f5jwf.free.fr/seq876.html) Manage bistable behaviour of WG Switch with position contact No PTT is forwarded until switch is in appropriated position Provide the PTT signal to LNA, TRVT, PA Tx/Rx delay ajustable with pot
F5jwf / Ph. Borghini / 20.05.2013
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UT-141 directional coupler > >
Directional coupler built with UT-141 semi rigid cable Design based on paper « a 50:1 bandwidth cost-effective coupler with sliced coaxial cable » http://f5jwf.free.fr/datasheet_fichiers/coupler_with_sliced_coaxial_cable.pdf
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This method allow easily coupling factor of 25…40dB with excellent directivity Lower coupling factor decrease rapidly directivity The shield of the 2 coax have to be drilled over at least lamda/4 The depth to drill depends of the coupling requirement and is given by fig3 below. Drilling can be done either by hand or with small drilling machine
F5jwf / Ph. Borghini / 20.05.2013
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MODBUS RS485
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This communication facilities allow reliable communication between TRVT box and Shack. 2 wired balanced serial transmission Modbus: layer 2 Adressed protocol with hardened CRC Device attached on the bus with daisy chain topology Transmission up to 115kbps over few hundred meters Low noise transmission avoiding EMC problem Modbus Protocol stack (function 3,4,6) written by F1TJJ RS485-USB interface module is needed
F5jwf / Ph. Borghini / 20.05.2013
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DETLOG module
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Measurement of Pfwd et Prev Measure T1, T2, +12V , +48V Balanced Serial Transmission RS485-MODBUS Synoptic running on Windows written in CVI (NI) http://f5jwf.free.fr/detlog.htm
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