Timeline for Why don't transponders have active and stand-by value like radios?
Current License: CC BY-SA 3.0
18 events
| when toggle format | what | by | license | comment | |
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| Apr 13, 2017 at 12:59 | history | edited | CommunityBot |
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| Oct 20, 2015 at 17:57 | comment | added | voretaq7 | @Simon I don't know about it being "common practice" (none of the folks I fly with do it). While I doubt it would be a serious issue in most cases, particularly in relatively empty airspace, it seems contrary to the guidance in the AIM. A sweep in "standby" mode means ATC loses your altitude (and possibly your whole target) until the system interrogates you again which could confuse their conflict alert software. I can't point to a FAR that says "don't do that", but it definitely seems strange to me. | |
| Oct 20, 2015 at 17:53 | history | tweeted | twitter.com/StackAviation/status/656528735131336704 | ||
| Oct 20, 2015 at 17:42 | comment | added | Simon | @voretaq7 Well, that's what I was trained to do, and my habit, and ATC have not commented once. AFAIK, it's common practice so disappearing for 5 seconds is probably no big shakes to them. | |
| Oct 20, 2015 at 17:34 | vote | accept | Jan Hudec | ||
| Oct 20, 2015 at 17:32 | vote | accept | Jan Hudec | ||
| Oct 20, 2015 at 17:33 | |||||
| Oct 20, 2015 at 17:32 | answer | added | voretaq7 | timeline score: 3 | |
| Oct 20, 2015 at 17:31 | comment | added | Ian Ringrose | The 10 second delay could be put into the radar software, also with a check that if the plane goes missing the last number is shown even if it was active for less then 10 seconds. | |
| Oct 20, 2015 at 17:29 | comment | added | voretaq7 | @Simon That standby mode prevents the transponder from responding to interrogations entirely (your target becomes a primary target only, with no data block). You should generally not set your transponder to its standby mode unless ATC tells you to. | |
| Oct 20, 2015 at 17:15 | comment | added | Roman | @IanRingrose well yes, the problem only exists on primitive transponders like the one with one knob per digit, precisely because they have relatively simple electronics inside. The knobs are probably wired directly into the sequencing hardware; they're too simple for an automatic 10 second delay. | |
| Oct 20, 2015 at 12:47 | comment | added | Ian Ringrose | Just having a short delay (10 seconds) after a new code is set before the transponder uses it, may be enough. | |
| Oct 20, 2015 at 11:29 | answer | added | Tyler Durden | timeline score: -4 | |
| Oct 20, 2015 at 10:02 | history | edited | Jan Hudec | CC BY-SA 3.0 |
added 8 characters in body
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| Oct 20, 2015 at 10:01 | comment | added | GdD | Not all radios have a secondary frequency which you set and then switch to, many older radios have only one frequency. | |
| Oct 20, 2015 at 9:58 | comment | added | Jan Hudec | @Simon, a stand-by position on the switch yes. But not a button that would activate the new value only after it has been fully set. | |
| Oct 20, 2015 at 9:36 | answer | added | DeltaLima♦ | timeline score: 11 | |
| Oct 20, 2015 at 9:31 | comment | added | Simon | They do. Every transponder I've seen has a standby position. | |
| Oct 20, 2015 at 9:25 | history | asked | Jan Hudec | CC BY-SA 3.0 |