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anandjm

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Posts posted by anandjm


  1. Anyway for some technical information. Assuming the wavelength of the signal to be 'L' where L=c/F, with c being the speed of light (say in centimeters) and F is the frequency (2.4GHz for Wireless b/g/n), then the Parabolic reflector should be kept at either L/4, L/2 or L distance from the antenna for maximum reflectivity. L/4 in this case works out to slightly over 3cms (more accurately 3.122838104cms). I had been using this technique since 2008 for EvDO. If you did not get any hints from this post for other frequencies, you can read http://anand.tch.in/2008/09/improving-signal-strength-of-evdocdma.html.


  2. If your school/college has an MSDN Academic Alliance, you can request for a Windows 7 Professional license key at no cost. The license key is valid for one 32bit and one 64bit installation (could be on two different systems). Alternatively you can get an IEEE or ACM membership for less than 30USD and get free access to MSDN. However this will not provide you with Windows 7 license key but you can get around 2 Windows 2008 R2 Server licenses which will be the same as Windows 7 (both are internally the same) after making some changes in settings and installing some packages.


  3. This has to do with the network rather than the SIM. The first SIM/RUIM I received from Tata Indicom when I took a CDMA connection way back in 2008 supported both CDMA and GSM networks. Except it would not work in India on GSM but would work abroad. I believe they used to call it the T-SIM.

    handset having single slot and accept both cdma ruim or gsm sim is seen.

    but single sim supporting both cdma and gsm network with single handset is still not available.


  4. I had GPS issues with the unofficial CSL GB ROM, so when the official Spice GB ROM came out I tried it out. It was decent for more than a week. Then I suddenly started suffering from a 5s wakeup lag problem on the official Spice ROM. Even reflashing the same ROM did not fix the problem. I could not flash any other ROM. Even CWM's recovery image would not work. But I was able to dump the recovery.img from the froyo ROM and flash back to the Cherry Magnum version. Happy for now. Inspite of the wakeup lag with the Spice ROM, I was getting over 2days of battery with 2G data on.

    Funny, I never faced wakeup lag with either the Cherry Magnum GB Rom or the CSL GB ROM floating around. Have no problem with Wifi or GPS either. I am currently using a stripped down CSL GB ROM. I easily get over a 1.5days of usage with the phone with data in 2G mode. This includes around 1hr of Fruit Ninja.


  5. Funny, I never faced wakeup lag with either the Cherry Magnum GB Rom or the CSL GB ROM floating around. Have no problem with Wifi or GPS either. I am currently using a stripped down CSL GB ROM. I easily get over a 1.5days of usage with the phone with data in 2G mode. This includes around 1hr of Fruit Ninja.


  6. No doubt Spice Mi 410 is a good phone, ticking all the boxes in specs, Gingerbread available at 14K...

    But with both Motorola Defy & HTC Desire available at 15.5K, whether the intending buyer will risk Mi 410 just for1,500?

    Spice needs to bring down the price to widen that gap.. That may make it a great motivator for value seekers & a Hot Seller..

    HTC Desire uses a first generation Snapdragon CPU with Adreno 200. The graphics performance is significantly improved with the second generation CPU with Adreno 205. Furthermore it also has HDMI out, and makes an excellent low cost development device. The quality of the gyro and rear camera is not upto the mark however. And to add some browny points to it, it is manufactured by Foxconn (the iPhone manufacturer).

    ^^^

    The same handset is available at a discounted price of12,999 at Dealsupto

    The specs described in different sites are confusing though. Some say its processor is of 800MHz (in the same page it is shown as 1GHz!). And the OS is froyo (not gingerbread).

    Its a 1GHz cpu. The list of devices it is sold internationally are:

    1. Huawei Ideos X6(Australia)/U9000/Ascend X(USA)

    2. CSL Blueberry Mi-410 (Malaysia/Indonesia)

    3. Cherry Magnum HD (Philippines)

    4. Welcomm A99 (Thailand)


  7. What is EXT4?

    ext4 is a filesystem used primarily by the Linux OS. It follows ext3 which by itself followed ext2. ext2 is the preferred choice on Android phones for the OS. Your sdcard uses fat32/vfat and hence is accessible on windows machines.

    On xda somebody said that"android run faster on ext4"?

    ...

    What are advantages and disadvantages of it?

    From my experience with Linux filesystems on desktops, all I can say is that there are no significant benefits on a single core mobile phone or tablets with shifting to ext4 if your phone already uses ext2 and you are using flash memory for the OS. In fact both read and write performance is likely to be slower and the life of the flash memory device could come down if you shift to ext4. The primary benefit is reduced chance of data corruption if processes hang/become irresponsive and if you have a habit of removing the battery without powering off the phone. The use of journaling on ext3/4 improves reliability.

    However on desktops which use Harddisks as the storage medium, an ext4 is better suited due to better reliability and lower disk fragmentation and improved read performance but at the cost of write performance.

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  8. Spice MI-410 itself comes with 2.2 build with CSL ROM. Any ROM from Spice will likely be the CSL version. I also heard that CSL was bought over by Spice.

    Note: any one buying this mobile, dont upgrade to 2.3.4 from any Cherry mobile or CSL mobile. Just wait for one month Spice itself is coming with 2.3 update for this phone.


  9. Used modified Skype for Voice Chat and its working smoothly.

    I managed to get the MI-410 up and running with Gingerbread ROM from the Cherry Magnum HD. Once you do this you can try the modified skype for video calls. The modified skype for video calls is available on xda-developer forums and works well with the Spice Mi-410 with the Cherry Magnum HD ROM. Also manually rooted it to enable proxy support for WiFi networks.


  10. With TI's customer care getting as bad as Airtel, I shifted to Airtel.

    Tata Indicom's customer care has deteriorated a lot. Earlier I used to call them and lodged any complaint/request and the same used to be attended very quickly. If I wrote an e-mail, it was used to be given top-most priority.

    But recently my experience is somewhat different. If I call 121 to say the quality of calls have fallen very low along with the railway lines from Bolpur to Howrah, they say that it is a handset problem. My friend called 121 to lodge the same complaint, but she was asked what handset she was using. When she told them it was LG Cookie 510, they gave her the LG service station number and asked her to have her handset checked from there.

    This is totally an evasive exercise and really exasperating. With new and good quality handsets, we are hardly ready to see this type of unwarranted suggestions.

    Tata Indicom should stop all these nonsenses.


  11. Alternatively look out for Dell Inspiron M101z (better than a netbook but slower than a full fledged notebook) from local dealers. The online price is bit expensive. Got a single core AMD Neo processor, with 2 GB RAM and 320GB HD and windows 7 home edition for 22000 from my local dealer.

    Found netbooks (my testbed for some of my projects) slightly less convenient compared to the Dell Inspiron M101z.

    Anand


  12. HTC Desire for 16500 at flipkart.com

    2.i need a android ph with a budget around 15k.

    i was looking forward for motorola defy. i had read a lot of good reviews about this ph and its specs are also good. its available for 14k+ at letsbuy after using discount coupon.but today one of the local retailer told me that motorola is going to shut down. and after sale service is very bad.

    another option i am keeping is lg optimus black p970 available at letsbuy for 18789/- after discount coupon. its better than defy in specs. and it also have nova display. i hv a bad kind of experience with lg but it was quite some time back. if its quality is good i can spend that much.

    even these ph are also there in almost same price range and almost same specs

    Samsung Galaxy S GT Black I9003,Samsung Google Nexus S

    which one do you guys suggest any other ph with my price range. as u guys always help me plz do it this time also....

    thanks

    Pulkit


  13. My comparison was for a given frequency. Not all GSM operators operate on 1800MHz. Many also operate on 900MHz. On dual network phones that support both CDMA and GSM but not both simulateously, I have consistently observed higher standby times on CDMA than on GSM. But when it comes to talk time things are reversed. In the case of GSM the energy is more focussed in particular frequency bands depending on the cell configuration. The possibility of interference is higher in GSM networks and hence there is a limit on the number of active callers a tower can handle. In CDMA however, the use of spread spectrum communication uses more energy overall, but is distributed across frequencies. Thus the radiation levels are lower but the energy levels are higher. I forgot to complete the second argument in favor of CDMA. Because the energy is spread over frequencies, it requires lesser energy to transmit in the presence of interference/noise. UMTS networks based on WCDMA also exhibit similar features due to the use of spread spectrum techniques unlike GSM.

    As far as I know and I agree with the article on this, CDMA phones are less dangerous than GSM ones. There are two reasons for this

    1. Power consumption is less during standby because CDMA phones check with the cell tower every few seconds (Slot Cycle Index) unlike GSM phones.

    2. The use of spread spectrum communication ensures that the energy is spread over frequencies and requires lesser energy to transmit.

    1. CDMA phones use more power because of the reason you mentioned.

    2. Spread spectrum means theoretically infinite users have full access to entire bandwidth using pseudorandom codes unlike GSM/UMTS which is FDMA+TDMA. But this code is effectively noise to all other channels other than the receiver which has the pseudorandom code. This is why it needs more power and power control is main issue in CDMA.

    Power and radiation/frequency are not same issue, this topic talks about radiation comparison which is determined by what frequencies these systems use.

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