I know the Navworx TransMonSPE is intended to pick up the encoded altitude and squawk by sniffing the info from the transponder cable (for older transponders that can't talk to the Navworx box otherwise).
Does the transponder have to be interrogated by a ground-based radar for the Navworx to send an ASD-B OUT signal via its UAT antenna, or does the Navworx box send periodic OUT messages, even if the transponder hasn't been pinged for awhile?
(The question came up because if one of the Nextgen objectives is to reduce reliance on ground-based radar, it's likely that there may be fewer ground-based radars eventually and maybe less frequent pings, especially in more remote areas.)
Does the transponder have to be interrogated by a ground-based radar for the Navworx to send an ASD-B OUT signal via its UAT antenna, or does the Navworx box send periodic OUT messages, even if the transponder hasn't been pinged for awhile?
(The question came up because if one of the Nextgen objectives is to reduce reliance on ground-based radar, it's likely that there may be fewer ground-based radars eventually and maybe less frequent pings, especially in more remote areas.)