m********u
发帖数: 3942 | 1 居然有这么多硬件职位也是不容易。。。 公司希望圣诞节前招到人，有兴趣的同学请
及时跟我联系~ 站内或者邮件 [email protected]
5个职位是：
1.Antenna/Mmwave Design Engineer
2.Navigation Engineer-GPS Systems
3.Technician
4.Sr. SWE-Embeded
5.Mechanical Engineer
1. Antenna/Mmwave Design Engineer
Here's what you will do:
Define antenna design/architecture requirements in overall system
performance and lead design review
Develop mm-wave antenna design from concept, simulation to design completion
Validate mm-wave antenna performance from manufacture to fa... 阅读全帖 |
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m********u
发帖数: 3942 | 2 【 以下文字转载自 JobHunting 讨论区 】
发信人: missingyou (miss), 信区: JobHunting
标 题: 5个自动驾驶硬件工程师职位（硅谷）
发信站: BBS 未名空间站 (Thu Oct 19 14:55:33 2017, 美东)
居然有这么多硬件职位也是不容易。。。 公司希望圣诞节前招到人，有兴趣的同学请
及时跟我联系~ 站内或者邮件 [email protected]
5个职位是：
1.Antenna/Mmwave Design Engineer
2.Navigation Engineer-GPS Systems
3.Technician
4.Sr. SWE-Embeded
5.Mechanical Engineer
1. Antenna/Mmwave Design Engineer
Here's what you will do:
Define antenna design/architecture requirements in overall system
performance and lead design review
... 阅读全帖 |
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a***y
发帖数: 19743 | 3 ☆─────────────────────────────────────☆
weidong (伊拉克学习小组副组长) 于 (Wed Jun 30 21:54:59 2010, 美东) 提到:
很无奈, 本来IPAD是个很风险的东西, 结果大热; 相反, IPHONE系统应该很成熟了,
结果出了大问题.
我想了一下, IPAD这个东西实际很奇怪, 他没有专门的FUNCTION, 你拿他画画, 看书,
玩游戏, 看书, 或者实在不堪看毛片, 所有的功能都是你定义的. 但是由于IPAD的
新颖性, 你可以用很不同的方法实现你定义的功能, 比如, 躺在床上用各种体位看
毛片. 于是我们很满意.
IPHONE就不同了, 功能已经预先定义好, PHONE, 如果这个出问题, 整个系统会受到
很大的怀疑, 至于那些锦上添花的东西, 由于没有下层建筑的支持, 就成了很虚无缥
缈的东西.
在长叹一个. 还是跟乔总的桀傲不驯的性格有关系.
☆─────────────────────────────────────☆
microbe (天涯思君不可忘) 于 (Wed Jun 30 2... 阅读全帖 |
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I***i
发帖数: 14557 | 4 http://www.nbcnews.com/technology/futureoftech/remote-control-t
Remote-control tech turns cockroaches into beasts of burden
Scientists have outfitted a cockroach with a high-tech backpack that allows
them to remotely control where it scurries.
While the concept may sound terrifying, anyone buried alive under rubble in
an earthquake will shout for joy at the sight of one of these bugs. The
shout will be relayed to rescue teams.
Search and rescue robots are already in use. Many were showcased duri... 阅读全帖 |
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w*******d
发帖数: 3714 | 8 ATTISAT flat antennas distinguish from all other satellite antennas due to
their impressive design and exceptional technical features.
In contrast with conventional parabolic antennas, ATTISAT flat antennas are
based on a totally different philosophy. Many small receivers collect the
signals sent by the satellite. They are then guided, via printed circuits,
to an amplifier (LNB) integrated at the back of the antenna.
所以走的是Antenna Array的路子，竟然跟我以前做的东西有点关系。。。
不过相对于锅子的一个天线接收，用阵列是不是成本会高一些？ |
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l******y
发帖数: 204 | 9 能给个大概reasonable的范围么
我在RFID书上看到：Due to the weak coupling between the reader antenna and
the transponder antenna, the voltage fluctuations at the antenna of the
reader that represent the useful signal are smaller by orders of magnitude
than the output voltage of the reader.
In practice, for a 13.56MHz system, given an antenna voltage of
approximately 100V (voltage step-up by resonance) a useful signal of around
10mV can be expected.
这意思是说，reader antenna发出的信号amplitude在100伏，card用load modulation
使rea... 阅读全帖 |
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w*******y
发帖数: 60932 | 10 I found some Alfa that have a $5.00 off Promo code - it took me while to put
this list together and I could have overlooked some listings, please let me
know if I missed anything and I will update this page.
This is NOT a FLAMING deal but for anyone interested in buying Alfa's now is
good time. They had the AWUS036H on 1saleaday yesterday for $19.99 shipped,
but for whoever missed that the price is pretty decent, and you can now buy
them in bundles with a longer antenna. There are some other mod... 阅读全帖 |
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a**********n
发帖数: 626 | 12 #1 Best Seller in Satellite Television Antennas
Audiovox ANT751R DGTL Outdoor or Outer Yagi Antenna
by Audiovox
4.5 out of 5 stars
Product Link:
http://goo.gl/XvY4dI
http://www.amazon.com/gp/search/ref=as_li_qf_sp_sr_tl?ie=UTF8&c
Review：
Impressed, December 28, 2013
By S. Wright
- Thankfully this product was easy to install and the instructions were
mostly easy to follow.
- I now have all the channels available in my area. This is great product
and worth the money.
-----------------------------... 阅读全帖 |
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x******p
发帖数: 827 | 13 我是新手，从来没用过thinkpad，这个EPP的discount，买哪款机器划算些啊（除了
W520）？我听说有些款做工不好，电池还松动。
再有有必要升级到i7吗？还是i5 2520就够了。
再有就是下面的display，camera不是有单独的选项吗，antenna又是什么区别呢？
12.5" HD (1366x768) LED Backlit Display, Mobile Broadband Ready, 2x2 Antenna
[$0.00] 12.5" HD (1366x768) LED Backlit Display, Mobile Broadband Ready, 3x3
Antenna, No Camera
[add $50.00] 12.5" Premium HD (1366x768) LED Backlit Display, IPS, Mobile
Broadband Ready, 2x2 Antenna
[add $50.00] 12.5" Premium HD (1366x768) LED Backlit Display, IPS, Mobile
Broadb... 阅读全帖 |
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P*O
发帖数: 4324 | 14 http://www.emrpolicy.org/public_policy/siting_zoning/tool_box.p
What You Need to Know
1. Federal law prohibits state and local agencies, including zoning boards,
from basing tower/antenna siting and construction permits on the harmful
environmental effects of radiofrequency (RF) radiation emissions “to the
extent that facilities comply with” the Federal Communication Commission’s
(FCC) regulations. [47 USC Sec. 332( c)(7)(iv)]. Courts and the FCC have
interpreted this law to apply to “human heal... 阅读全帖 |
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f********t
发帖数: 4574 | 15 Make sense。I am in a total cost cutting mode, building a rack and buying a
house
http://www.spadout.com/a/staying-safe-with-3-antenna-avalanche-beacons/
Three Antenna Beacons
The most recent development in beacon technology is the addition of a third
antenna. “Three antennas give you more resolution because they have the X,
Y, and Z directions,” said Greene. Many models currently have a third
antenna: Barryvox Pulse, Pieps DSP, Ortovox Patroller (formerly X1), D3, and
S1.
The main purpose of the |
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k**0
发帖数: 19737 | 17 据说应该没问题了
加新图：
http://gizmodo.com/5846538/apple-fixed-the-antenna-problem-for-
Apple Fixed the Antenna Problem for the iPhone 4S (Hopefully)
Apple just announced the iPhone 4S and it looks exactly the same as the
iPhone 4! Does that mean it's plagued by the iPhone 4's notorious
attenuation problem? No, not anymore. This time around, they fixed the
antenna.
What did they do? According to Phil Schiller, there are now two antennas on
the iPhone 4S and their engineering team built a system where the ... 阅读全帖 |
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o****3
发帖数: 33 | 18 导弹可以有repeater antenna,接受几十MILES 以内的BASE STATION 信号, 不需要减速
3, 低空, 高速飞行中的导弹是可以稳定地接受到BASE STATIONS 的信号的.
Antenna design, 大的天线设计可以增加距离. 天线也可以设计成repeater antenna,
这样一来增加手机接受BASE STATIONS 的距离, 和可靠性. 无线手机可以接受6 MILES
以内的BASE STATIONS 的信号. 飞机上的手机当飞机低空盘旋在大都市( 有很多BASE
STATIONS) 即使没有repeater antenna 或其他天线, 也可以稳定接受信号. 但是在偏
僻地区, 在没有特殊天线的时候, 飞行物体中的手机能接受到信号的时间很短( 1分钟
以内) |
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w*******r
发帖数: 7276 | 19 Increasing the receiving antenna gain can boost the receive signal power and
increase the signal to noise ratio ( assume the receiver noise floor is due
to thremal noise at the front end). I bet the receive antenna used in moon
landing broadcast will be huge. BTW, the broadcast used analog transmission.
So the signal quality will degrade gracefully with lower SNR ratio, not
like the digital comm, once you are below certain BER, the image will not be
decodeable.
Estimation will be simple for a co... 阅读全帖 |
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w*******r
发帖数: 7276 | 20 HEHE, you know nothing about satellite communication, this is for sure. Can
you tell me what kind of other distortion you are talking about? The
satellite channel is roughly a Line of sight AWGN channel. Tx and Rx antenna
gains, Tx power, distance between the two, and transmission bandwidth,
receiver noise floor basically are the factors influcing the performance.
What is your 信号传播中的噪声，引起信号变形? BTW, the deep space rx antenna
used in moon landing has a diameter of 230 feet ( around 80m), which is ... 阅读全帖 |
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d*b
发帖数: 21830 | 21 你那想法早有了，叫patch antenna, 找本天线原理的书看看吧。
HF patch antenna的问题是，发射功率handle不了大的，HF都是远程通信用的，一般都
要100W左右的发射功率，小型的patch antenna做不了这么大功率的，你要光接收信号
，patch antenna在HF波段完全没有优势。
至于长波段，你可以申请FCC experimental license, 比如美国500KHz段就有5张试验
执照。 |
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c****3
发帖数: 10787 | 22 看是那种wifi，这种就挺好。
等效辐射功率32W，直线覆盖距离3公里，放两个在房间里，肯定有惊人效果：
Signal King 300000N
Power :: 2000mW
Antenna :: 16 Dbi Dish Antenna
Signal King 250000N
Power :: 1800mW
Antenna :: 16 Dbi Panel Antenna |
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h***x
发帖数: 66 | 23 Far field is proportional to the Fourier transform of the current on the
antenna.
In general it is not trivial to find current on the antenna given the
voltage and antenna geometry. You need to use numerical algorithm such as
MOM.
You can download 4NEC2 from Internet and learn more about antenna. |
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a********r
发帖数: 597 | 24 啥时ips屏？
Display type
12.5" HD (1366x768) LED Backlit Display, Mobile Broadband Ready, 2x2
Antenna
[$0.00]
12.5" HD (1366x768) LED Backlit Display, Mobile Broadband Ready, 3x3
Antenna
[add $42.50]
12.5" Premium HD (1366x768) LED Backlit Display, Mobile Broadband Ready,
2x2 Antenna
[add $42.50]
12.5" Premium HD (1366x768) LED Backlit Display, Mobile Broadband Ready,
3x3 Antenna
就这四个选项， 3x3的都不能选。 |
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l***y
发帖数: 207 | 25 不好意思哦，问个超级菜鸟的问题。
Lenovo T420 怎么买的时候没有PSI的选项呢？
只有一个14.0 HD+ (1600 x 900) LED Backlit Antiglare Display, Mobile
Broadband Ready。还是PSI已经包含在里面了。
X220里面倒是有几个选项，请问哪一个是呢？
12.5" HD (1366x768) LED Backlit Display, Mobile Broadband Ready, 2x2 Antenna
12.5" HD (1366x768) LED Backlit Display, Mobile Broadband Ready, 3x3 Antenna
12.5" Premium HD (1366x768) LED Backlit Display, Mobile Broadband Ready, 2x2
Antenna
12.5" Premium HD (1366x768) LED Backlit Display, Mobile Broadband Ready, 3x3
Antenna
呵呵，不好意思，多谢了哦 |
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z***q
发帖数: 907 | 26 谢谢各位，x220已经不生产了，看来只有买230了。
另外还有几个问题，如果我想自己换ssd，应该选哪个硬盘呢？320G 7200rpm 还是500G
5400rpm? 好像有7mm 还是9mm的区别？
屏幕选12.5" Premium HD (1366x768) LED Backlit Display, Mobile Broadband
Ready是所谓的IPS？ 应该选3x3 Antenna还是2x2呢？
如果选3x3 Antenna，是不是wifi要选Intel Centrino Ultimate-N 6300 AGN与之匹配
呢？可以选6205么？
官网上加smart card reader好贵啊，如果不选，买来后有地方自己加么？
另外，webcam是自动加上的么？为什么选配置的时候没有这一项？
不好意思，问题有点多，谢谢高手赐教！
配置如下：
Description
ThinkPad X230 - 1 Year Depot Warranty Edit
Processor: Intel Core i5-3210M Processor (3M Cach... 阅读全帖 |
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b**********r
发帖数: 408 | 27 请问IPS屏是哪个选项？
Display Type
An integrated web camera is not allowed on displays that include a 3x3
antenna.
12.5" HD (1366x768) LED Backlit Display, Mobile Broadband Ready, 2x2 Antenna
[add $50.00] 12.5" Premium HD (1366x768) LED Backlit Display, Mobile
Broadband Ready, 3x3 Antenna
[add $50.00] 12.5" Premium HD (1366x768) LED Backlit Display, Mobile
Broadband Ready, 2x2 Antenna
★ 发自iPhone App: ChineseWeb 7.7 |
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a**6
发帖数: 106 | 29 if antenna restriction at your qth, another option is to put up an attic
antenna such a DIY J-pole antenna. a fun antenna project as well. |
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x**w
发帖数: 7947 | 31 看了一下，觉得就是替这个不make sense的结局解释。其实没啥好解释的。一定要解释
最完满的解释是阿汤挂了的时候的濒死幻觉。
电影里这个结局，如果是真的发生的话，无论怎样都指向一个事实：omega是纯雷锋，
一旦自己被杀，
就把杀了自己的敌人送回到战斗还没开始的时候。让对手不发生任何伤亡，而自己不复
活。
原作里不是这样。分antenna backup server三个。每次server（或杀server的敌人）
被杀，只要antenna／backup还没被杀，antenna／backup就会发出信号传回30小时前时
空给server让server（或杀server的敌人）知道未来的事情。对杀server的敌人来说，
一开始很多loop，不明白的时候感觉好像复活了一样。那个女人后来掌握诀窍，每次就
先杀antenna／backup，再杀server。这样对方不能发信号回过去。这场战斗就以人类
获胜告终。再时间推进打新一场战斗。 |
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n*********n
发帖数: 5605 | 32 谢谢，
看了下T510屏幕有三个选项:
15.6" HD Anti-Glare Display with LED Backlight
15.6" HD Anti-Glare Display with LED Backlight and WWAN Antenna
15.6" HD+ Anti-Glare Display with LED Backlight and WWAN Antenna
是不是没区别？
T410的怎么样？
14.1 WXGA TFT, w/ LED Backlight (WWAN antenna)
14.1 WXGA+ TFT, w/ LED Backlight (WWAN antenna) [add $30.00] |
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z***q
发帖数: 907 | 34 谢谢各位，x220已经不生产了，看来只有买230了。
另外还有几个问题，如果我想自己换ssd，应该选哪个硬盘呢？320G 7200rpm 还是500G
5400rpm? 好像有7mm 还是9mm的区别？
屏幕选12.5" Premium HD (1366x768) LED Backlit Display, Mobile Broadband
Ready是所谓的IPS？ 应该选3x3 Antenna还是2x2呢？
如果选3x3 Antenna，是不是wifi要选Intel Centrino Ultimate-N 6300 AGN与之匹配
呢？可以选6205么？
官网上加smart card reader好贵啊，如果不选，买来后有地方自己加么？
另外，webcam是自动加上的么？为什么选配置的时候没有这一项？
不好意思，问题有点多，谢谢高手赐教！
配置如下：
Description
ThinkPad X230 - 1 Year Depot Warranty Edit
Processor: Intel Core i5-3210M Processor (3M Cach... 阅读全帖 |
|
s*******r
发帖数: 310 | 35 屏幕应该选哪个？
Display Type
An integrated web camera is not allowed on displays that include a 3x3
antenna.
12.5" HD (1366x768) LED Backlit Display, Mobile Broadband Ready, 2x2 Antenna
[add $50.00] 12.5" Premium HD (1366x768) LED Backlit Display, Mobile
Broadband Ready, 3x3 Antenna
[add $50.00] 12.5" Premium HD (1366x768) LED Backlit Display, Mobile
Broadband Ready, 2x2 Antenna |
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c**********0
发帖数: 197 | 36 I experienced a lot of pain in the similar path. I had BS/MS in physics in
China and
chose EM phd in the US.
But I would like to say, EM guys will be more popular and welcomed, with the
wireless
evolves to higher and higher frequency.
For foreign ppl, antenna is not a good topic. You can not get into the
defense
industry easily, but it is a real high tech. And the commercial antenna is
dying when
the antenna size is shrinking and shrinking. It is a cost driven game in the
commercial antenna.
You |
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i*********n
发帖数: 320 | 37
Vortex radio waves could boost wireless capacity “infinitely”
After four years of incredulity and not-so-gentle mocking, Bo Thide of the
Swedish Institute of Space Physics and a team in Italy have finally proven
that it’s possible to simultaneously transmit multiple radio channels over
exactly the same wireless frequency. In theory, according to Thide, we could
potentially transmit an “infinite number” of TV, radio, WiFi, and
cellular channels at the same time over the same frequency, blasting ... 阅读全帖 |
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w*******y
发帖数: 60932 | 38 Rosewill RNX-N180UB (1T2R) IEEE 802.11b/g/n USB 2.0 Wireless Adapter with
Hardware WPS Button
Up to 300Mbps Download Data Rates
Support 64/128-bit WEP (Hex & ASCII)
WPA/WPA2
WPA (TKIP with IEEE 802.1x)/WPA2(AES with IEEE 802.1x)
$24.99
-$13.00 Instant
$11.99
-$3.60 30% off w/ promo code [COUPON=32756]RWYEAREND[/COUPON], ends 1/6/12
$8.39
http://www.newegg.com/Product/Product.aspx?Item=N82E16833166049
Brand: Rosewill
Model: RNX-N180UBSpec
Standards:IEEE 802.11b/g/n
Wireless Data Rates: Up to 30... 阅读全帖 |
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o****3
发帖数: 33 | 40 低空, 高速飞行中的导弹是可以稳定地接受到BASE STATIONS 的信号的.
Antenna design, 大的天线设计可以增加距离. 天线也可以设计成repeater antenna,
这样一来增加手机接受BASE STATIONS 的距离, 和可靠性. 无线手机可以接受6 MILES
以内的BASE STATIONS 的信号. 飞机上的手机当飞机低空盘旋在大都市( 有很多BASE
STATIONS) 即使没有repeater antenna 或其他天线, 也可以稳定接受信号. 但是在偏
僻地区, 在没有特殊天线的时候, 飞行物体中的手机能接受到信号的时间很短( 1分钟
以内) |
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a*****8
发帖数: 38 | 41 Position: Chief Engineer
Direct Report to: R&D Director
Work Location: Shanghai
Position purpose:
• We are looking for a technical expert with the position of Chief
engineer, in the design of Base Station Antennas and related research.
Responsibilities:
• Has design/research experience in BSA(Base Station Antenna) and
can provide technical direction to help RF engineers solving technical
issues.
• Can provide technical training to application engineers a... 阅读全帖 |
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G*******n
发帖数: 6889 | 43 The Captor-E will feature an innovative “re-positioner” with two rotating
joints so that the array can cover a wide field of regard (WFoR).
electronic scan angle + pointable gimbal-mounted mechanical scan angle =
wider angle of view vis-a-vis fixed AESA
"AESA And Typhoon
Posted by Bill Sweetman at 2/19/2009 10:24 AM CST
Everyone buying fighters wants an active electronically scanned array (AESA)
these days, no doubt after reading Dave "Mr AESA" Fulghum on the subject.
But Eurofighter remains war... 阅读全帖 |
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d**********6
发帖数: 4434 | 44 车的接口是这样
Radio Constant 12V+ Wire: Orange/Black
Radio Switched 12V+ Wire: White/Black
Radio Ground Wire: Chassis
Radio Illumination Wire: Green/White
Radio Dimmer Wire: n/a
Radio Antenna Trigger Wire: n/a
Left Front Speaker Wire (+): White/Blue
Left Front Speaker Wire (-): Black/Blue
Right Front Speaker Wire (+): White/Red
Right Front Speaker Wire (-): Black/Red
Left Rear Speaker Wire (+): Yellow/Blue
Left Rear Speaker Wire (-): Gray/Blue
Right Rear Speaker Wire (+): Yellow/Red
Right Rear Speaker... 阅读全帖 |
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B*Z
发帖数: 7062 | 45 我在网上看了半天，感觉是这样的setup，请问对不对？
1.每个轮胎里面有个sensor和wireless的 sending unit，负责发送信号。
2.每个wheel well里面有个antenna，负责接收信号
3.后面trunk里面有个control unit(RDC)负责处理信号。
请问这个准确么？有没有那个antenna的照片我可以看看antenna在哪里，长什么样子。
Costco的那个机器叫什么名字，怎么跟costco的说呢？我朋友说是车子碰了一个pot ho
le以后就跑出来这个warning，reset了以后又会跑回来。 |
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a**e
发帖数: 8800 | 47 Make a Thinkpad T510. Total $792.60. Is this good?
What is "15.6" HD Anti-Glare Display with LED Backlight and WWAN Antenna"?
and Much difference between " Windows 7 Home Premium 32" and " Windows 7
Home Premium 64"?
Thanks
So far:
Processor: Intel Core i5-560M Processor (2.66GHz, 3MB L3)
Operating system: Genuine Windows 7 Home Premium 32
]
Display type: 15.6" HD Anti-Glare Display with LED Backlight and WWAN
Antenna
System graphics: Intel HD Graphics with Always On USB for T510... 阅读全帖 |
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