The Realization of Telemetry Transmitters with Very Wide Bandwidths

Abstract

The coming of high bit rate PCM and high quality television as common modulation formats has placed stringent bandwidth requirements on telemetry transmitters at S-Band. Two wideband FM transmitters are considered in this report: One for frequency deviations up to ±1 MHz with rates as high as 1.5 MHz; and a new transmitter with up to ±10 MHz deviation and an 8 MHz baseband response. Presented in this report is a new discriminator of the symmetrical Foster-Seeley type. It is capable of 33% peak-to-peak bandwidth and excellent linearity, that allows very wideband requirements to meet in a practical FM feedback transmitter.