Answers are grounded in this paper and cite their sources.
This paper describes the receiver modulator of the TD-3 repeater. This modulator is a single-diode downconverter with an integral IF preamplifier. Its significant features are the use of a Schottky barrier diode, a waveguide directional filter, two lowpass filters for harmonic suppression, and image frequency absorption. The amplitude transmission characteristic of the modulator is flat to ±0.01 dB for ±6 MHz, and the average noise figure is 6.7 dB.
No takes yet. Share an insight, caveat, or question.
Abele et al. (1968) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: