Talk:Transponder

Number of transponders per satellite

Can somebody prove to me that all C-band TV satelites have 24 transponders, and all Ku-band ones have 32? miterdale 12:03, 7 Jul 2004 (UTC)

They don't. SES Astra Astra 1A was Ku band and was 16, and theres bloody huge Ku band ones with 50-60 or higher txp's in use for Europe, such as the later Hotbird's. --Kiand 03:46, 2 August 2005 (UTC)

Categories needed

This needs categories to get it noticed. I may add them when I feel like it/can decide which best to use, etc.--DooMDrat 06:05, Mar 22, 2005 (UTC)

Terrestrial transponders

Can somebody please enlighten me on the possibility/existence of satellite transponders on the ground transmitting on Ku Band and how different is it from other trancievers? What advantage if any over existing transceivers? User talk:As_kiah8 13:41, 3 June 2006

Radio-ranging to spacecraft

Transponders have been included on several spacecraft, including Viking and Pathfinder, in order to allow accurate distances to the planet (Mars, in those cases) to be acquired by measuring the delay in return signal. It allows improvement of our models of the Solar System, once you account for some solar-plasma-type effects. This article should probably include some info. Tfr000 (talk) 16:28, 3 January 2012 (UTC)

Why would transponders be turned off?

Why can airline transponders be turned off in the cockpit? Isn't it essential safety equipment for others? Somebody please clarify in the article. Background: On Malaysia Airlines Flight 370 the transponders were apparently turned off in the cockpit. If they hadn't been, it would be clearer, sooner, where the plane had gone, and much suffering and thousands of person-hours would have been saved. A pilot advised me that (a) all avionics have on-off switches (maybe that's a necessary principle?) and (b) that it may be necessary to turn a transponder off and on, because it's "touchy" or air traffic control requests it. Would welcome expertise here. -- econterms (talk) 19:05, 16 March 2014 (UTC)