w*********r
发帖数: 42116 | 1 An Air India flight had to make a precautionary landing at the Indira Gandhi
International Airport on Monday morning after a transponder defect was
detected. The Delhi-Chicago flight, a Boeing 777, returned within three
hours of take off.
Air traffic control (ATC) uses an aircraft’s transponder to identify it and
aircrafts with defective transponders are not allowed to enter the European
airspace, prompting the Air India flight to return.
The incident, airport sources said, was reported at 2.15 ... 阅读全帖 |
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k*****r
发帖数: 21039 | 2 transponder是主动报告自己的位置，雷达不许要transponder就能探测飞机。 |
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w*******4
发帖数: 5 | 3 When you contacted the controller, a discreet 4 digit code will be assigned
and to be entered in your transponder. It will show up on the controller's
monitor to identify your aircraft. If the transponder is turned off. It's
only a dot on the controller screen and you will no longer be known. |
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m*****i
发帖数: 628 | 4 车子已经注册到外州了，以后回麻省的机会也不多了。需要把fastlane transponder邮
寄回麻省归还吗？ 还是自己保存？transponder里还有10块钱。 |
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k*****r
发帖数: 21039 | 5 雷达能track, 但transponder被关了，必是恐怖袭击无疑了。 |
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e******u
发帖数: 3206 | 6 cnn专家说机械故障也会使transponder和通信一起坏掉 |
|
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b********6
发帖数: 35437 | 8 NBC的专家说飞机上有十个发电机，全部fail才会把transponder的电断掉 |
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c****h
发帖数: 4968 | 9 是机械设备就有失灵的可能。也不能太责备马来猴，因为没有transponder再强大的雷
达也不能探测到是什么飞行器。更何况马来这样的国家，要是换作中美俄之类的，发现
不明飞行体从领空飞过，造就派出战斗机了。 |
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x****u
发帖数: 12955 | 10
You are talking about military radar. Many civilian air traffic radar needs
transponder signal to identify aircraft. |
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k*****r
发帖数: 21039 | 11 那就不是雷达，是个transponder接收器。
雷达，or电探，是主动发射波速，然后探测回波来探知飞机的。
needs |
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x****u
发帖数: 12955 | 12
Even if the traffic radar is as good as military radar, it still wouldn't
know exactly which aircraft corresponds to which blip on the radar screen.
Transponder is what allows the ATC radar screen to display aircraft
identification. |
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s**********d
发帖数: 36899 | 13 这个是每次飞行都要设置，打开的。
上次南航失事那架，在机场边上雷达都看不到，空管现让飞行员打开transponder.
★ 发自iPhone App: ChineseWeb 8.6 |
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d*b
发帖数: 21830 | 14 你们所谓的“position transponder“是雷达应答器，这玩意的作用是，飞机的雷达应
答器的天线收到对方雷达的信号后，在规定的time frame里发射一个莫尔斯编码的脉冲
，这个编码主要是飞机的呼号，对方雷达接收到脉冲后解码，就能够把屏幕上的回波点
跟某架特定的飞机联系起来。
举个例子，越南航空管制雷达在地平高度30度，方位250度，距离100nm的地方收到编码
为9M-MRO的雷达应答，但雷达又探测到地平高度30度，方位251度的地方也有一架飞机
，这样，越南空管就能把雷达屏幕上方位250的点跟MH370联系起来，而不是251度的点。
那么没有雷达应答器，越南空管是不是就不能发现MH370了？这个显然是不是的，雷达
应答器的目的只是为了帮助空管识别飞机的呼号而已，雷达屏幕上几千架飞机密密麻麻
的，你要没雷达应答器还真不好识别，但现代很多空管雷达带自动标绘功能，比如预警
机上的雷达就是，这样的雷达能自动标绘每一架进入探测区域的飞机航迹，还有很多空
管雷达能自动lock目标，即使雷达应答器故障，也能根据以前的应答继续跟踪飞机，所
以雷达应答器的目的只是为了方便对飞机呼号的识... 阅读全帖 |
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g******e
发帖数: 3760 | 15 也许。按理说transponder不应该干扰其它信号啊。 |
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l*******l
发帖数: 1 | 16 请问各位：
Boston哪里可以copy Passat Transponder Key？
谢谢 |
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t*m
发帖数: 4414 | 17 【 以下文字转载自 Boston 讨论区 】
发信人: tim (Tim), 信区: Boston
标 题: Fastlane transponder 过 EZpass 有折扣吗？
发信站: BBS 未名空间站 (Mon Oct 24 16:21:14 2011, 美东)
EZpass customer 有折扣， fastlane user pay cash price?
在fastlane 过了几回纽约的 toll, 忘了回来看账单了。 |
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c********l
发帖数: 8138 | 18 EZPass不再收月费了，太好了
Dear Valued E-ZPass Customer,
I am pleased to inform you that as of July 1, 2014, Virginia’s E-ZPass
program will no longer charge a monthly maintenance fee on transponders. In
April 2014, Governor McAuliffe signed legislation that required the
elimination of the monthly maintenance fees by September 1, 2014. At the
Governor’s direction, we are implementing this change two months early.
In the coming days, you will receive more details regarding the terms and
conditions of Virgi... 阅读全帖 |
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l*****i
发帖数: 136 | 19 我从AZ搬去SF上班，带着老婆路过LA，大约在晚上9点钟左右从全统广场附近上I10
west，然后进入expresslanes, 在101下，全程估计1mile左右？我们没有 fasttrack
transponder，所以罚款是肯定了。问题是，如果罚单寄到我原来地址，我是没有办法
收到的，这种情况下我该如何知道罚单号交罚款呢？恳请高手指点。。。 |
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z*******n
发帖数: 1034 | 20 Inmarsat offers airlines free global tracking to prevent another MH370
BY Daniel Cooper @danielwcooper May 12th 2014, at 4:38:00 am ET 35
After the disappearance of Malaysia Airlines flight MH370, the idea that a
plane could simply vanish in an age of information seemed impossible.
Satellite company Inmarsat is pledging to prevent the situation from
happening again, and will offer tracking services to every passenger airline
, free of charge. In the system, all planes would ping Inmarsat's track... 阅读全帖 |
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j***a
发帖数: 10844 | 21 好像是说支持大家抗议（6/12前），说明很快会有行动了。
Dear E-ZPass Customer,
With Virginia’s E-ZPass program doubling over the next several years as new
toll roads open, the Virginia Department of Transportation (VDOT) is
proposing a monthly fee of about $1 per transponder to pay for
administrative and operations costs.
VDOT has the utmost understanding that E-ZPass operations brings convenience
and efficiency to toll operations. E-ZPass allows for electronic toll
collection at Virginia toll facilities and lessens the ... 阅读全帖 |
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p********r
发帖数: 1432 | 22 打算飞EIK-COS-00V-EIK. 起来以后联系Denver approach.
他们虽然看得见我的squawk code, 但看不见我的高度, transponder的Mode C坏了.
死活不让进DEN的Class B, 想想这样进COS的Class C也比较麻烦，只好掉头回家了.
Transponder没有全坏,只是报高度的Mode C不行了. 这个问题怎么能在地面上就查出来
呢? Transponder有一个test button. 这个是检查Transponder还是Mode C呢? 大家pre
-flight的时候查不查transponder? |
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d********f
发帖数: 43471 | 23 飞行员是个发烧友，想要测试777的极限，关掉通话系统，直接升到4万多尺的高度上，
然后全机人昏过去了，飞机掉到2万多尺，自动飞行系统接管，飞到没油了掉了下去。
SEPANG, Malaysia — Malaysia Airlines Flight 370 experienced significant
changes in altitude after it lost contact with ground control, and altered
its course more than once as if still under the command of a pilot, American
officials and others familiar with the investigation said Friday.
Radar signals recorded by the Malaysian military appear to show the missing
airliner climbing to 45,000 feet, above the approved a... 阅读全帖 |
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K*****2
发帖数: 9308 | 24 这条有道理吗？
After seeing the radar I cam to the conclusion that there was a bomb aboard
which was set off by a altitude device when the plane reached 35,000 feet.
First off the transponder is located usually on the belly of the aircraft
and when the explosion went off it wipe out the belly releasing the
transponder which I believe had a backup battery. If one looked at the radar
you could see the plane twisting in different directions which if the
transponder was sailing around on the way down that ... 阅读全帖 |
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P*********0
发帖数: 265 | 25
航空管制雷达是被动雷达。飞机的transponder必须工作才能采集信息。这里
transponder被关了。
所以航空管制雷达失效了。
军用雷达是主动雷达，和transponder没关系。
From wiki
Secondary surveillance radar (SSR)[1] is a radar system used in air traffic
control (ATC), that not only detects and measures the position of aircraft i
.e. range and bearing, but also requests additional information from the
aircraft itself such as its identity and altitude. Unlike primary radar
systems that measure only the range and bearing of targets by detecting
reflected radio signals... 阅读全帖 |
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h****y
发帖数: 9234 | 26 嗯.那可能确实吧,不同车program的方式确实不同,我的车没那么复杂,一把钥匙拧一拧就
能编程了
不过ford系的我记得有个很好的好处就是钥匙的transponder可以自己program. 所以你
买个带transponder的钥匙回来自己能配, 成本也很低,这个很爽. 你可以找找有没有卖
带transponder的对应你这车型的钥匙.
我的车transponder只能去dealer那里弄.不能DIY |
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W****o
发帖数: 51 | 27
我怎么觉得你是在坑人呢。。。收起来，不扣钱的话，到时候还得自己打电话惹麻烦！
HOW DOES E-ZPASS WORK?
The E-ZPass transponder is a radio frequency device.
Mount the E-ZPass transponder as instructed.
Use designated E-ZPass lanes when entering and exiting our roadway.
Drive through the E-ZPass lane - Do Not Stop.
As your vehicle enters the roadway, an antenna mounted below the E-ZPass
sign will read the transponder.
The travel information is recorded by the transponder as you enter and exit.
A toll amount is calculated and deducted fr... 阅读全帖 |
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s**********8
发帖数: 25265 | 28 A medical device is a product which is used for medical purposes in patients
, in diagnosis, therapy or surgery[citation needed]. Whereas medicinal
products (also called pharmaceuticals) achieve their principal action by
pharmacological, metabolic or immunological means. Medical devices act by
other means like physical, mechanical, physico-chemical or chemical means.
Medical devices are included in the category: Medical technology.
Medical devices include a wide range of products varying in comp... 阅读全帖 |
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y*****n
发帖数: 145 | 29 你怎么看不懂，地面雷达只负责收
飞机如果不发射，它就自然消失了
不是普通人那种射一组波出去，等反射回来，然后delta T * speed /2计算距离
doppler 计算纵向速度
不是这种radar
http://en.wikipedia.org/wiki/Transponder
In air navigation or radio frequency identification, a transponder is a
device that emits an identifying signal in response to an interrogating
received signal.
http://en.wikipedia.org/wiki/Secondary_surveillance_radar
Secondary surveillance radar (SSR)[1] is a radar system used in air traffic
control (ATC), that not only detects and measures the position... 阅读全帖 |
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o*****D
发帖数: 1563 | 30 这个是通过transponder获得的
transponder和卫星通讯原理不一样
transponder低空飞行，控制塔就收不到
卫星通讯，只要不在水下，都能收到，就是在水面，也能收到 |
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g**1
发帖数: 10330 | 31 Missing Flight Left Data Trail
Jetliner 'Pinged' Satellites With Location, Altitude for Hours After
Disappearance
Communication satellites received intermittent data "pings" from a missing
Malaysia Airlines 3786.KU -4.08% jet, giving the plane's location, speed
and altitude for at least five hours after it disappeared from civilian
radar screens, people briefed on the investigation said Thursday.
The final satellite ping was sent from over water, at what one of these
people called a "normal" cr... 阅读全帖 |
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l**********i
发帖数: 11748 | 32 这车好像是用transponder key的
楼主你最好去试试你的备用钥匙带不带transponder
不然明天打不着火耽误事
具体情况依据owner's manual有关transponder key的章节为准 |
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j*e
发帖数: 1987 | 33 谢谢链接。我看了一下这个链接，是说租车公司的车都是EXpressToll Customers，可
以自动通过车窗上的transponder扣钱，然后用那个自动付钱的话，租车公司会收一笔
手续费。问题是我当时为了避免被租车公司额外charge钱，故意没有把那个
transponder翻开来，想自己付现金。谁知道它没有付现金的booth。
现在问题是，我既然没有用它的transponder，租车公司就没有理由收我手续费。E-470
只会bill车主，应该不会通过租车公司再找到我直接寄bill到我家。我还欠E-470两块
五，有没有办法主动找E-470付掉？或者说我直接无视之，等于免费走了趟toll way？
请有经验的大侠说说？ |
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v******f
发帖数: 4509 | 34 按它申请表上的说法，这个装置（transponder）不收费，如果付cash/check需要$25的
押金，如果用credit card就不用付押金（transponder丢了坏了会直接从卡里扣钱）。
transponder需要充值$40（credit card）或 $50（cash/check）。AAA现在打八折（$
32买$40）。
https://www.metroexpresslanes.net/en/about/application_LLC_agreement.pdf
比较有意思的是它信誓旦旦地说启用 express lane 相当于高速上减少了多少多少辆车
，减少了多少多少加仑汽油、能量消耗、空气污染等等，不知道怎么算出来的。不管你
信不信，反正我是不信了。只能指望他们收了钱以后，能够做点真正能改善交通的事。 |
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s*****g
发帖数: 2140 | 35 You have to have a transponder to use the fastrack lanes, even you are
carpooling. New transponders have a switch for you to indicate 1, 2, or 3
or more occupancies. There is a monthly fee for the transponder, $2, 3 or 5
, don't remember exactly. However, the monthly fee will be waived if you
use fastrack four times or more in the month, carpooling included. |
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g*k
发帖数: 152 | 36 Car Pool 是免费的。如果不是car pool 又没有fastrak帐户，被警察抓到至少要罚341
刀。
http://fastrak.511sd.com/PDFs/I-15_FAQv3.pdf
Can I use the Express Lanes if I am in a carpool?
Yes. Carpoolers use the I-15 Express Lanes free of
charge and do not need a FasTrak transponder to
use the lanes. However, motorists who travel on the
Express Lanes as solo drivers but sometimes carpool
must have a FasTrak transponder and a current
FasTrak account. When traveling in a carpool, you
should seal your transponder in the silver static |
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B*Z
发帖数: 7062 | 37 在机场里面就有卖的，还是必须现在外地就买了，邮寄过来？
两种transponder:
SunPass Slim Portable Transponder
SunPass Mini Sticker Transponder
那种好用？另外iOS/Android的app是怎么样和sunpass配合使用的？多谢指教了。 |
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m****p
发帖数: 865 | 38 原文在这里
没武装没护航，在争议岛上飞了一圈，土工没干预没询问，也许b52的隐身性能太好，
飞得太快，土工被迅雷不及掩耳盗铃得打脸了。
WASHINGTON—A pair of American B-52 bombers flew over a disputed island
chain in the East China Sea without informing Beijing, U.S. officials said
Tuesday, in a direct challenge to China and its establishment of an expanded
air-defense zone.
The planes flew out of Guam and entered the new Chinese Air Defense
Identification Zone at about 7 p.m. Washington time Monday, according to a U
.S. official.
Over the weekend, Beijing said i... 阅读全帖 |
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C*I
发帖数: 4736 | 39 别说把transponde关了，就是没有transponde的那么大一块石头在天上飞，是个雷达都
能看见。 |
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s***d
发帖数: 15421 | 40 1.transponder 是什么时候cut off的
2. 最后雷达消失的地点是马六甲
如果这些都是对的，那就不用想了，如果本国家的飞机cut off了transponder 开始乱
飞，马猴会干吗？ 派飞机去追，或者叫美帝派飞机坠。
有一种可能是还没追上，飞机不见了。或者打下来了。 |
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g******o
发帖数: 4042 | 41 New information, U.S. officials told CNN, indicates the missing airplane
could have flown for several hours beyond the last transponder reading.
Malaysian authorities believe they have several "pings" of engine data from
the airliner's service data system, known as ACARS, transmitted to
satellites in the four to five hours after the last transponder signal,
suggesting the plane is believed to have flown into the Indian Ocean, a
senior U.S. official told CNN. That information combined with known ... 阅读全帖 |
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g******o
发帖数: 4042 | 42 这算哪门子后门
外行不知道罢了
网友都多少都知道点
Assuming the satellite transceiver is a Rockwell-Collins HST-2110 (I'm not
sure, but it's my best guess), the unit requires 110V AC power. It's
difficult to imagine that sort of power being available in a fragment of a
wrecked airplane - which suggests that:
- IF the plane carried this transceiver and
- IF signals from this unit of this plane were detected hours after the
transponder signal disappeared,
THEN
- the plane did not lose all power (i.e., the transponder was... 阅读全帖 |
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m*****e
发帖数: 10963 | 43 WSJ has confirmed that the pilot had the ability to manually turn off the
transponder on Flight MH370. Why is the transponder so significant? WSJ's
Jason Bellini has #TheShortAnswer
无法贴出Video。。。 |
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o*****D
发帖数: 1563 | 44 发现Boeing真的太烂了，经过此次事件，有4点要改善：
问题1：不要用什么radio。radio根本是模拟信号，传输距离有限，而且没有加密。飞
到大洋上去，怎么通讯呢？
改善方案：每架飞机应该有一个卫星电话，地面可以随时打上去；甚至可以强行（比如
在公司较高级别的authorization之后）接通收听cockpit的语音环境；而不是让
cockpit想turn off就turn off。
问题2：ACARS可以人工turn off
改善方案：GPS应该不间断，发到地面server；
问题3：transponder可以人工turn off。
解决放案：transponder不应该可以手动关闭。如果不断发出错误信息，应该由地面的
软件，手动and/or自动暂停接受某驾飞机的信息。
问题4：语音最多只能录2小时。
改善方案：iphone的录音，都比黑匣子长！2个小时太tama烂了。改用iphone录音算了。 |
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J*****3
发帖数: 525 | 45 看来你是行家了， 不知你讲的有没有link依据. 据下面的专家讲法，有相应知识的人
或飞机师就有能力关掉这些开关，没提至少要俩人以上。
U.S. aviation safety experts say the shutdown of communications systems
makes it clear the missing Malaysia Airlines jet was taken over by someone
who knew how the plane worked.
To turn off the transponder, someone in the cockpit would have to turn a
knob with multiple selections to the "off" position while pressing down at
the same time, said John Goglia, a former member of the U.S. National
Transportation Safety Board. That's ... 阅读全帖 |
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z**********e
发帖数: 22064 | 46 http://www.nytimes.com/2014/03/18/world/asia/malaysia-airlines-
By MATTHEW L. WALD and MICHAEL S. SCHMIDT
WASHINGTON — The first turn to the west that diverted the missing Malaysia
Airlines plane from its planned flight path from Kuala Lumpur to Beijing was
carried out through a computer system that was most likely programmed by
someone in the plane’s cockpit who was knowledgeable about airplane systems
, according to senior American officials.
Instead of manually operating the plane’s controls,... 阅读全帖 |
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P*********0
发帖数: 265 | 47 You assume too much.
Secondary radar doesn't rely on echo.
Air traffic control - standard international practice is to monitor airspace
using two radar systems: primary and secondary.
Primary radar -based on the earliest form of radar developed in the 1930s,
detects and measures the approximate position of aircraft using reflected
radio signals. It does this whether or not the subject wants to be tracked.
Secondary radar, which relies on targets being equipped with a transponder,
also requests a... 阅读全帖 |
|
G**L
发帖数: 22804 | 48 你们搞物理的博士给讲讲大傻能传300公里的结论是肿么来的
http://en.wikipedia.org/wiki/Underwater_locator_beacon
A 37.5 kHz (160.5 dB re 1 μPa) pinger can be detectable 1–2 kilometres (0.
62–1.24 mi) from the surface in normal conditions and 4–5 kilometres (2.5
–3.1 mi) in good conditions. A 37.5 kHz (180 dB re 1 μPa) transponder
pinger can be detected 4–5 kilometres (2.5–3.1 mi) in normal conditions
and 6–7 kilometres (3.7–4.3 mi) in good conditions. Transponder 10 kHz (
180 dB re 1 μPa) range is 7–9 kilometres (4.3–5.6 mi... 阅读全帖 |
|
发帖数: 1 | 49 2017年6月29日05:15, Europasat/HellasSat 3和GSAT-17由Ariane 5自库鲁发射
Europasat/HellasSat 3是希腊的直接音频视频通讯卫星，拥有30个Ku频道，覆盖北非/
欧洲/中东，定位于东经39度。
GSAT-17是印度通信卫星，拥有24 C-band, 2 lower C-band, 12 upper C-band, 2 CxS
(C-band up/S-band down), and 2 SxC (S-band up/C-band down) transponders. It
will additionally carry a dedicated transponder for data relay (DRT) and
search-and-rescue (SAR) services.
GSAT-17通信卫星 |
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p*i
发帖数: 1481 | 50 我的车是2002 corolla，打算给我的车买个keyless car remote。网上找到个地方发现
能买。上面有个说明：
You have 90 days warrantee on 2002 TOYOTA COROLLA keyless entry remote or
key blank, make sure your TOYOTA is equided with a keyless remote system or
immobilizer, transponder key system.
我不确定我的车是否有a keyless remote system or immobilizer, transponder key
system？怎么能查到呢？车是二手的，而且manual已经掉了。谢谢！ |
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