- modulated subcarriers from the subcarrier oscillators are the FM carriers. Receivers 1 and 2 are not limited to the modes of operation shown in Fig. 3. They can be simultaneously APOLLO operated either singly or together in either the open-loop SPACECRAFT or closed-loop configuration on any one… … ence loop of the receiver. DETECTED PM UP-DATA UNDETECTED FM SPECTRUM-DATA AND AND VOICE , TV SPECTRUM ' r VOICE SUBCARRIERS DIGITAL COMMAND The X and Y channel signals are not preamplified, but SYSTEM (DCS) AND DATA-DEMODULATOR are applied directly to the dual-channel angle receiver. SUBCARRIER…
