FRIENDCOM FC-302 - Theory of Operation

FC-302 Data Radio User Manual
Page 4
Receiver Specification
RX Sensitivity
(12dB SINAD)
25KHz Channel Spacing
＜-119dBm Extreme＜-115dBm
12.5KHz Channel Spacing
＜-119dBm Extreme＜-115dBm
ACP
25KHz Channel Spacing
＞70dB
12.5KHz Channel Spacing
＞60dB
Image Rejection
＞70dB
IF Rejection
＞70dB
Spurious Rejection
＞70dB
Intermodulation Suppression
＞65dB
Conducted Spurious Emission
＜-57dBm
Receiving Audio Distortion
＜5%
RX SNR
25KHz Channel Spacing
＞45dB
12.5KHz Channel Spacing
＞40dB
Audio Output Power 0.5W @ 8Ωload
3 Theory of Operation
Fig. 1 Overall Circuit Diagram