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Mode A, B, C Transponder Questions..  
User currently offlineSLCPilot From United States of America, joined Aug 2003, 529 posts, RR: 3
Posted (9 years 6 months 3 weeks 6 days ago) and read 3416 times:

Somebody asked me the other day what Mode A, and Mode B were with respect to transponders. I always thought Mode was just the "code" while C included the encoded alitiude. What is mode B?

Also, with respect to VFR cruising altitudes in the U.S., why does 14 CFR 91.159 refer to VFR cruising altitudes at the flight levels? I thought all the traffic was IFR up there.

Thanks in advance !

SLCPilot


I don't like to be fueled by anger, I don't like to be fooled by lust...
5 replies: All unread, jump to last
 
User currently offlineMxCtrlr From United States of America, joined Nov 2001, 2485 posts, RR: 40
Reply 1, posted (9 years 6 months 3 weeks 6 days ago) and read 3409 times:

You are correct on the A and C but you forgot the new Mode S (which is transponder with Altitude Encoding and TCAS).

MxCtrlr  Smile/happy/getting dizzy
Freight Dogs Anonymous - O.O.T.S.K.  Smokin cool



DAMN! This SUCKS! I just had to go to the next higher age bracket in my profile! :-(
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1338 posts, RR: 29
Reply 2, posted (9 years 6 months 3 weeks 5 days 23 hours ago) and read 3405 times:

Mode A = Identity
Mode C = Altitude
Mobe B was planned for, but never used, at least not in civial aviation.

User currently offlineAvioniker From United States of America, joined Dec 2001, 1109 posts, RR: 11
Reply 3, posted (9 years 6 months 3 weeks 5 days 23 hours ago) and read 3403 times:

Actually Mode S is so named because it Selectively interrogates other nearby aircraft transponders in coordination with TCAS to determine proximity and threat. It also transmits the registration or international identification code of the aircraft so it may be specifically identified for interrogation by other Mode S transponders in the area.
The name isn't accurate in that a Transponder responds to interrogation and an Interrogator initiates interrogation or communication (i.e. DME Interrogator vs. ATC Transponder) The name stays because the primary purpose is still to respond to ATC queries for control.


One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
User currently offlineLiamksa From Australia, joined Oct 2001, 308 posts, RR: 0
Reply 4, posted (9 years 6 months 3 weeks 5 days 15 hours ago) and read 3359 times:

Also, with respect to VFR cruising altitudes in the U.S., why does 14 CFR 91.159 refer to VFR cruising altitudes at the flight levels? I thought all the traffic was IFR up there.

Here in OZ generally the max VFR altitude is FL200 due to VFR altimeter accuracies.

Rob.

User currently offlineNormalSpeed From , joined Dec 1969, posts, RR:
Reply 5, posted (9 years 6 months 3 weeks 5 days 14 hours ago) and read 3353 times:

Hey SLC! I used to live in Utah County, and did most of my flying in Provo. I've flown to SLC numerous times, though. Did my 10 night tower landings for the Commercial on 17. Fun stuff.

Drop me a line, eh?

-Normal
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