Engineering topics
Publications and source records attributed to Mysoor, N..
A new Spacecraft Transponding Modem (STM) is being developed by the Jet Propulsion Laboratory for NASA for deep space communication applications.
A new Spacecraft Transponding Modem (STM) is being developed by the Jet Propulsion Laboratory for NASA for deep space communication.
This package provides space for mounting up to five MMIC chips and has three RF and five DC feed-throughs.
A breadboard single-section low-loss analog phase modulator with good thermal stability for a spacecraft transponder application has been analyzed, fabricated, and evaluated. A linear phase shift of 70 degrees with a linearity tolerance of plus or minus 7 percent was measured for this modulator from 8257 to 8634 MHz over the temperature range -20 C to 75 C. The measured insertion loss and the static delay variation with temperature were within 2 plus or minus 0.3 dB and 0.16 ps/C, respectively. Four sections will be cascaded to provide the X-band (8415 MHz) phase modulator. The generic modulator design can also be utilized at 7950 to 8075 MHz followed by X4 multiplication to provide modulation of a Ka-band downlink signal.