Loss of signal with iphone4

Anyone having an issue with the iphone4 losing the signal? I'm in town and usually get a full signal strength but at numerous times it will lose all bars and wont connect without me having to power it down and then turning it back on.?????

elkaholic wrote:
Anyone having an issue with the iphone4 losing the signal? I'm in town and usually get a full signal strength but at numerous times it will lose all bars and wont connect without me having to power it down and then turning it back on.?????
Since powering the device off and on resolves the signal issues outlined on your post, I would recommend to use the Restore function for your device as a first step to resolve this issue. Using the Restore function for your device will bring your phone to original factory condition and will resolve any possible settings conflicts with the network.
You can find detailed instructions to Back up, Update and Restore your device at the link below:
http://support.apple.com/kb/HT1414

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IPhone Death Grip and Loss of Signal

There is NO doubt the new iPhone has "death grip" "loss of signal" issues. Including my new iPhone, there are 4 Verizon phones in my home. All 4 phones show 3 bars when laying on the counter. The iPhone consistently, everytime, drops to 1 bar when it is picked up and held in a normal position. The other 3 phones (HTC Incredible, Blackberry Curve 8330, and an LG Cosmos all maintain 3 bars when picked up and held in a normal position. In fact, when I recived my first call on my iPhone the caller complained my voice was breaking up. NONE of my other phones have that problem. I called Verizon support on my iPhone, and they said my call was breaking up. I changed my holding position so I was pinching the the front and back of the phone (not touching any of the metal frame), and they said they could hear me much better. Nice test, huh? I have checked this situation over and over. I am not going to "pinch" my phone to use it. I am not going to spend more money on a bumper or case to use it. I am going to hold Verizon to their promise that that the known antenna issue with the iPhone was fixed. I am going to return my iPhone for a full refund and HIGHLY recommend that ANYONE who thinks the antenna issue is fixed is flat out WRONG. I HAD a lot of confidence in Verizon and Apple before this fiasco. There is NO DOUBT in my mind that both of them new full well that the defect still existed and still hyped and released a defective product. I will be the first to gladly participate in any class action suit that comes out of this - which I am sure it will. DO NOT BUY AN IPHONE 4.

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At any rate, I'm sorry that the iPhone did not live up to your expectations, but your experience is not definitive of all iPhone users any more than mine is.

HT4061 IPhone 4s Unexpected loss of signal

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Unexpected loss of signal and communications have occurred to the point that I cannot use my phone any longer. I went to see my telephone service provider and they told me that there is no problem with it (service, signal, chip, etc.) but they have been aproached by many IPHONE 4S users reporting the same problem.
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Is it possible to condition a load cell signal with a 1520 SCXI and then use it as the primary analog feedback for a 735X motion control board?

My system
PXI 1052 chassis
PXI 8196 RT controller
Flexmotion 7356 motion controller
Flexmotion 7354 motion controller
6259 M series DAQ
1520 SCXI
1520 SCXI
1314 SCXI frount mounting terminal block
DSM strain gage load cells
Exlar SR Brushless PM motors
Kollmorgen servo star CD series 5 drives
My objective:
I want to measure the force on the load cells with the 1520 SCXI (i.e. excite the load cell then amplify and condition its output) then I want to use this analog (force) signal as the primary feedback for my motion control system (7356 and 7354 motion controller connected to my drives and motors).
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The motion controller boards (7356 and 7354) can be configured for force feedback control via analog feedback from a load cell. However the boards implicitly expect the load cell signal to be amplified and conditioned with and external signal conditioner rather then using an NI SCXI module. Currently I’m am reading the SCXI signals via the 6259 M seriers DAQ and consequentially have no way to route the signal into the 735X boards for force feedback control. I can use softmotion to control the motors but then I loose the fast PID update rates possible with the 735X boards.
The question:
Is it possible to condition a load cell signal with a 1520 SCXI and then use it as the primary analog feedback for a 735X motion control board?
Thanks
Patrick Aubin
Ph.D Candidate
University of Washington &
VA MedicalCenter of Excellence for
Limb Loss Prevention and Prosthetic Engineering

Hi GG,
Thank you for your feedback.
>create your own external circuitry to amplify the signal.>
True a few op-amps could amplify and filter the signal externally but the performance of such an amateur built system will never match the accuracy and functionality of the 1520 SCXI. That’s why we spent the $2500 for the professional version.
>One thing that you could do is to use a UMI with your motion controller and then wire your signal from your SCXI to the UMI.>
As I understand it the UMI is basically a break out connectivity interface for third party drives. After conditioning and amplifying the analog force signal with the SCXI module the analog signal isn’t available to wire into a UMI. To my knowledge the conditioned signal of the SCXI resides only in the PXI backplane (i.e. there is no physical access to the conditioned analog signal). Can you explain how the UMI could be help here.
Again thanks for your input GG.
Patrick

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hii...
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The problem is in the writing procces.. I have no idea how to write data to file with low level vi.. I'm new in LabVIEW and I already try some modification to my program but it still don't work as i want.
I want the writing procces only occur when i press the button and it only run for a few second with constant time stamp.. It just to check if there are any data missing or not.. The system are a fast (It's what make problem bigger).
I'm getting crazy at all.. If some one could help me i will be very grateful... I'm using LabVIEW 8.5 and PCI 6259...
Kind Regards,
Dani
-Keep Learning-
Attachments:
Read Circle Encoder.gif ‏22 KB

Hi Dani,
here's the two-loop version...
When you use the local you wouldn't need the queue at all... But using locals may lead to race conditions (not in your simple vi, but general) - locals don't provide "atomic" data access.
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Attachments:
circle.vi ‏48 KB

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Please do not type in all caps, that is considered shouting on a public forum and also rude which I am sure is not your intent. I would also suggest reposting in the Keynot forum, that is where the Keynote gurus are likely to be.
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that does make sense, that it could be the old ones.
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Hello LabView Gurus,
Being a power engineer and having just a little knowledge of signal processing and labview, I have been pulling my hair out for the last couple of days to get a better estimation of phase difference between two signals.
We have two analog voltage signals; 1. sine wave (50Hz ± 1Hz) and 2. a square wave with exactly half of sine wave frequency at any time.
At the starting point of operation (and simulation/acquisition) both signals will have no phase difference. However, the square wave's frequency changes unpredictably for a just a few millisecond but then it gets synchronized with sine wave's frequency again. This means that the square wave will be phased out from its original position. The task of the labview is to find the phase difference between the two signals continuously.
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As this part is just a small block of a big project, I can only allow 5000Hz sampling rate each for both signals. I read 500 samples (which means I read data from 5 cycles of sine wave and 2.5 cycles of square wave).
Now the problem is, as long as the frequency of sine wave stays constant at exactly 50Hz, I get a good estimation of the phase difference but when the frequency changes even a little (and it will happen in the real scenario i.e 50Hz ± 1Hz and the square wave's frequency is dependent of sine wave's frequency), the estimation error increases.
I have attached my labview program. From front panel, you can set the phase of square wave (between -180 and 0) and you should see the labview's calculated phase in the indicator box named 'Phase'. Then you can press 'Real Frequency' switch that would cause the frequency to change like it would in real operation.
You can observe that the estimation error increases after you push the button.
All I need to do is to reduce this estimation error and make it as close to the actual phase difference as possible. Any help would be greatly appreciated.
I am using LabView 2009 for this task.
The application is for electric machines and the stability/performance of machines under different faults.
Thank you for reading this far!
Regards,
Awais
Attachments:
v603.png ‏320 KB
v603.vi ‏186 KB

Jeff Bohrer wrote:
Basic math gives me a bit of pause on this approach. You are sampling at 50 times the frequency of interest so you get 50 samples per cycle. your phase resolution is 1/50th cycle or 7.2 degrees +/- noise. You will need to samlpe faster to reduce phase resolution or average multiple readings (at a time cost that is signifigant)
Jeff- (Hardly Working)
I am sampling at 100 times the sine wave's frequency and 200 times the square wave's frequency. Increasing the sampling rate completely solves my problem. But since I am acquiring several other inputs, I cannot afford a sampling rate higher than 5kHz.
F. Schubert wrote:
I'm not a signal processing expert, but here my basic understanding.
If you simulate sampling with 5kHz and a frequency of 50 Hz (and both are 'sync' by design), you always get an exact 5 periods. Any variation of your signals frequency gives you a propability to get 4 or 6 'trigger' events. That's an up or down of 20%!
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I suggest you to check on wikipedia for some of the keywords I mentioned. Go also for the external links which lead to great tutorials and AppNotes on the signal processing basics.
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Felix
www.aescusoft.de
My latest community nugget on producer/consumer design
My current blog: A journey through uml
An interesting view. the sine wave can indeed be looked as a second harmonic of the square wave. I will implement your idea and get back to you as soon as I get some results. But since I have very limited knowledge of signal processing, it might take me a while to get my hear around the solution you mentioned.

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I did some voltage- measurements and everything worked fine. Then i disconnected the power source and measured the temperature with a PT1000 in four-wire-mode ... also worked fine.
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