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Technical Support / Re: Help Funke transponder ttr800a connection
« on: November 23, 2021, 06:53:06 pm »
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One ‘SD + FLARM’ subscription covers use of SD on up to 2 mobile devices simultaneouslyActually, you can use more than two mobiles devices concurrently running SD in moving map/traffic display mode; only two can be logged on for live updates at once.
The GTX 35R/45R transponders are compliant with RTCA/DO-181D, which specifies that the selection of transponder ALT and GND modes may not be controlled by the pilot. To allow the transponder to beoperated in ALT mode while on the ground, for the purposes of performing periodic testing in accordancewith the requirements of 14 CFR Part 91.413, the G3X system provides a special transponder ground maintenance test mode. Refer to the G3X installation manual (190-01115-01) for information
I know that I could very well be wrong but, as I understand it, Mode S transponders will continuously transmit their address but the extended squitter doesn't reply with all the other Mode S information until the address is received by the ground station (for instance) and THEN that address it is interrogated for the other stuff. So it blasts away an address but that is not the information that we need from the Mode S information or the extended squitter data for ADSB nor to test if the transponder is working properly. You might get the HEX address of the aircraft but nothing about its altitude etc, nor about the other data that is 'selected'.My point is that with a conventional transponder set to 'ON' it won't transmit Mode S nor Mode C, just the squawk; you need to set them to 'ALT'. I'm not familiar with the 35R but would assume the same applies, so that you can de-select squawking the altitude if requested by ATC.