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#1
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Basic 1090
That’s right
Basic mode a/c a mode A/c transponder without ads b out. Mode S can be selectively interrogated by radar. Rather than just interrogating everything in sight. But even mode S doesn’t have ads b out. Only mode S extended squitter (ES) replaces w ads vector info. What I’m hearing is once you get away from major metropolitan airspace, a lot of smaller aircraft not equipping w ads b If they don’t go into the airspace that requires it, they don’t have to get it. It’s a mixed blessing. Great where everyone has it, but no guarantee one is seeing everyone else.
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David Wartofsky Potomac Airfield 10300 Glen Way Fort Washington, MD 20744 
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#2
02-18-21, 06:14 PM
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My old Bonanza had some sort of a "Transponder sniffer" traffic device that was probably from the 1980's - whenever it sensed a transponder nearby a red light flashed and there was a warning tone. It had HI-LOW sensitivity, you kept it on HI, then if you got an alert switched it to LOW. If you got another alert, you knew the other plane was closing on you. It sure did keep your head on swivel when it alerted - Good times...
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Hybrid Mode
