Furiz Posted September 30, 2021 Posted September 30, 2021 RF Switch when set to quiet stops radar from emitting or scanning, according to the Viper manual page 36 it says: "RF Switch. The radio frequency, or RF, switch, is a three-position switch that allows you to control emissions from your aircraft. When set to silent, all electronic signals for the aircraft are disabled, to include the radar, radar altimeter, data link, TACAN transmit, and ECM. In quiet mode though, the radar, TACAN, and data link transmit but all other emissions are inhibited." When I set it to quiet, the Radar is not scanning, but I can hear the TACAN tone, HSI TACAN arrow points to the correct heading, and contacts on HSD are moving, changing altitude etc. Radios work both in quiet and silent mode. Radar altimeter works in quiet and in silent mode. Datalink works in silent mode. TACAN works in silent mode. can't test ECM atm.
Frederf Posted September 30, 2021 Posted September 30, 2021 It is possible for some emissions while the switch is in out of norm. Pilot-initiated IDM datalink activity occurs and of course reception of IDM DL info is unaffected. MIDS is set to power low in quiet and inhibited in silent for Link 16. TACAN is receive-only in both quiet and silent. TACAN mode is momentary, resuming last setting when RF norm. IFF replies are strangled in quiet/silent. AIFF interrogations are allowed when pilot commanded (TMS left) in quiet/silent. Radar continues to track priority targets (e.g. some AA bugs, FTT, ACM) "NO RAD" accurately reflects status of radar (e.g.blink in SAM between track and search). CARA operates in quiet as normal, silent may depend on CARA model (silent strangles older, sets LPI mode in newer? Might be customer option) ECM pod is interrupted in its current operation but can be commanded to resume Communication radios (except for the purposes of IDM automatic data transmission) are unaffected by RF switch The RF switch would also affect terrain following radar emissions if so equipped. 1
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