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Does a Mode-S transponder transmit anything that SBS-1 captures even when it is not being interrogated/is outside cover of a Mode-S interrogator?

April 26, 2017captures cover interrogated interrogator outside sbs-1 transmit transponder

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Does a Mode-S transponder transmit anything that SBS-1 captures even when it is not being interrogated/is outside cover of a Mode-S interrogator?

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Yes, ADS-B, if it is an ADS-B equipped transponder. This will provide GPS position data in suitably equipped aircraft. Non-ADS-B equipped Mode-S transponders will not provide this position information anyway, just the aircraft ID and squawk code. 3. Does a Mode-S transponder reply to a Mode 3/A interrogation (If the answer is yes, the question then is does it reply something that SBS-1 handles) It replies to Mode A and C interrogators with Mode A/C replies. These are not decoded by the SBS-1.