Develop Bugs

GSM Frequency Change, dual-band to quad or tri-band

Greetings, can anyone please tell me if there is any way to get my T-mobile device to recognize other GSM frequencies? It is currently a dual-band pocket pc device and I would like to make it such that it recognizes the 850 Cyngular frequency in the US. In other words, how can I make my dual-band device a quad or tri-band device?

ksymeonides said:
Greetings, can anyone please tell me if there is any way to get my T-mobile device to recognize other GSM frequencies? It is currently a dual-band pocket pc device and I would like to make it such that it recognizes the 850 Cyngular frequency in the US. In other words, how can I make my dual-band device a quad or tri-band device?
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Hmm. i would say only by soldering. It's a hardware limitation of the device...
Stefan

The MDA/XDA II device is already tri-band.
or did I missunderstand you?
greets Alex

alexball said:
The MDA/XDA II device is already tri-band
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That's right. But the MDA/XDA I is only a dual band phone.....
Stefan

Yeah, my device is only dual band. I thought that perhaps all these devices initially had the potential or ability to pick up any signal but that it was a software issue to actually start doing so. I am not too good with the techy lingo, but is there something called "soft phone"? I can't imagine companies manufacturing very similar phones overseas and in the US and the only difference being that one is dual band and the other tri band. It makes sense that these devices are all quad band and the company places limitations on them depending on where they are purchased

no the HF VHF and UHF and so forth need a frontend which cant just be programmed like that it have to do with filters and such as in before the signal ever get close to being digital and programmable

GSM BAND SWITCHING SOFTWARE
DOES ANY ONE KNOW WHERE CAN I GET A HOLD OF THIS? THANKS

hi Rudegar
can you shed a little more light on the filters and hardware change that would be required to change a frequency or activate another if the chip has it. ( sometimes it is capable but not activated )

Tp2 arrives at the fcc

LINK.... http://www.engadget.com/2009/04/01/htc-rhodium-t-mobile-wing-ii-hits-the-fcc/

So it´s closer and closer!
Thanks for the info

looking through the documents, it was tested with the full 3G/HSDPA/HSUPA spectrum... should be unlockable and usable on AT&T! sold.

So... it's for at&t and not tmobile? What are the available bands? I had a hard time interpreting them. I thought it was tmobile 3g....

sino8r said:
So... it's for at&t and not tmobile? What are the available bands? I had a hard time interpreting them. I thought it was tmobile 3g....
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m.carroll just meant that it's got full 3G Spectrum capability and can be used in on US bands. However, I think this is the US FCC and therefore it would be doing this anyway. I was under this impression this is the US Tmo unit and not the european Tmo.
Either way though, it's looking like all of the 4 major carriers will be getting this unit at some point so we don't need to worry too much.

What I'm wondering is what are the specific specs of this unit. It will likely represent the specific specs of most of the American carriers. Specifically, did they keep all the features like the front facing VGA camera, the full executive speakerphone, keep the same processor or improve it, and keep or improve the ram/rom. US versions of the original TP were some what hadicaped, so I'm hoping that won't repeat. Even though there isn't a ton I can do with it, I really want to keep that front facing VGA camera.'
Come on Sprint! How much longer?

yeah, I figured it out. It was hard to read the pdfs from my phone. This particular model seems to have AT&T's 3g bands. But on of the docs lists another model which may be the cdma version or tmobile usa version. Some folks are saying this is the euro/asia version but why in the hell would the fcc (usa based) need to pass that, lol?!
link to fcc docs: https://fjallfoss.fcc.gov/oetcf/eas/reports/ViewExhibitReport.cfm?mode=Exhibits&RequestTimeout=500&calledFromFrame=N&application_id=819923&fcc_id=%27NM8RHOD100
bands copied from pdf:
GSM and WCDMA:
Operating Frequency Rated
Power
GSM/GPRS/EDGE, 850,
Class 12 824.2 MHz– 848.8 MHz 33 dBm
GSM/GPRS/EDGE, 900,
Class 12 880.2MHz – 914.8MHz 33 dBm
GSM/GPRS/EDGE, 1800,
Class 12 1710.2MHz-1784.8MHz 30 dBm
GSM/GPRS/EDGE, 1900,
Class 12 1850.2MHz – 1909.8MHz 30 dBm
WCDMA/HSUPA/HSDPA
Band I 1922.4MHz – 1977.6MHz 24 dBm
WCDMA/HSUPA/HSDPA
Band VIII 880.4MHz – 914.6MHz 24dBm
Cellular Phone Standards
Frequency Range and
Power:
HSUPA data rate: uplink up to 2Mbps
HSDPA data rate: downlink up to 7.2Mbps
Type of Emission: GSM850: 253KGXW, GSM1900: 249KGXW
EDGE850: 247KG7W, EDGE1900: 245KG7W​IMEI: 35884502
link for second model... https://fjallfoss.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=1086902&native_or_pdf=pdf

Well, it has been leaked that the CDMA model for sprint will be GSM capable for using overseas. I don't know if it will be capable of using HSPDA in the US on our frequencies though. If so, it would make switching carriers very simple. Either way, it's nice to have a phone that you can throw a sim card in and go. That is as long as you can get it unlocked.

It has WCDMA band I & band VIII so it's an Euro/Asia version.

Poke_N_PDA said:
What I'm wondering is what are the specific specs of this unit. It will likely represent the specific specs of most of the American carriers. Specifically, did they keep all the features like the front facing VGA camera, the full executive speakerphone, keep the same processor or improve it, and keep or improve the ram/rom. US versions of the original TP were some what hadicaped, so I'm hoping that won't repeat. Even though there isn't a ton I can do with it, I really want to keep that front facing VGA camera.'
Come on Sprint! How much longer?
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The front-facing camera will almost certainly be gone. I bet the speakerphone will be kept, and they certainly won't improve the processor. RAM/ROM upgrades are doubtful but slightly more possible, but that would suggest a pretty outrageous price for it too, so I'm hoping they stick with the published specs. Look for Sprint to start selling it no sooner than October, probably more like Mid-November.

Can the Desire do 5.76mbps HSUPA?

I noticed that according to Qualcomm's press release
http://www.qualcomm.com/news/releas...first-chipset-solutions-break-gigahertz-barri
Snapdragon processor does 5.76mbps HSUPA by default.
The Desire is only set to Catagory 5 HSUPA which is 2mbps.
Can 5.76mbps be enabled???
I noticed in /system/build.prop you can change the HSDPA/HSUPA catagory settings

Samsung Galaxy S doesn't have Snapdragon, it has Hummingbird.

Just for information; made some tests with speedtest app on a cpl of servers, max download speed I could see was 4,6 mbit/s (my location Gothenburg/Swe, test server Aarhus/Denmark) and upload speed was appr 1 mbit/s, that was the highest speeds i hv reached by far. Hv no any clue abt technical details in terms of hsdpa, hsupa or whatever hw configuration built in my phone (Desire, network: 3 Sweden)
Sent from my HTC Desire using XDA App

iLHaNroID said:
Just for information; made some tests with speedtest app on a cpl of servers, max download speed I could see was 4,6 mbit/s (my location Gothenburg/Swe, test server Aarhus/Denmark) and upload speed was appr 1 mbit/s, that was the highest speeds i hv reached by far. Hv no any clue abt technical details in terms of hsdpa, hsupa or whatever hw configuration built in my phone (Desire, network: 3 Sweden)
Sent from my HTC Desire using XDA App
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The Desire is only 2MB HSUPA capable. Honestly, that's massive uplink for a phone.

JohnSteveDoe said:
The Desire is only 2MB HSUPA capable. Honestly, that's massive uplink for a phone.
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Sorry but my diamond1 and my old touch pro both have 7.2Mbit HSDPA, as does the desire. So 2Mbit is not that massive ever since 2006, yeah I had a TyTN too

We are talking about UPLOAD (7.2Mbit is download).

RandomDude said:
I noticed that the Samsung Galaxy S which also has the Snapdragon processor does 5.76mbps HSUPA by default.
The Desire is only set to Catagory 5 HSUPA which is 2mbps.
Can 5.76mbps be enabled???
I noticed in /sys/build.prop you can change the HSDPA/HSUPA catagory settings, however even though I edit mine, the settings appear to be overwritten every time at startup. (android 2.1)
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for starters the galaxy s has a hummingbird processor, thats an omap chip not an arm cpu like the snapdragon and 5 or 2 mbps unless you was sat directly under an empty cell tower that you had all to yourself you wont get anything ike that so it dosent matter lol

sorry my bad, lost my lenses
anyway is there a network with 5 mbit uplink, I'll be switching
I tought omap is texas instruments and they manufacture and modify arm cpu architecture, is that right?

I have 6.2Mbit DL and up-to 1.3Mbit upload here

Whoops... to clarify... I incorrectly mentioned the Galaxy S...
What I meant to say was, according to Qualcomm's own press release (see my revised post above)
"The QSD8250 supports HSPA data rates of up to 7.2 Mbps on the downlink and 5.76 on the uplink, with full backward compatibility"

AndroHero said:
for starters the galaxy s has a hummingbird processor, thats an omap chip not an arm cpu like the snapdragon
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OMAP is an ARM CPU, too. ARM is the underlying architecture.

AndroHero said:
for starters the galaxy s has a hummingbird processor, thats an omap chip not an arm cpu like the snapdragon
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Both the hummingbird and the Snapdragon are ARM7 instruction set processors.
If anything, the Hummingbird is an ARM CPU, and the Snapdragon is not, because the Hummingbird is based on the ARM Cortex A8 CPU core which is an ARM7 processor, and the Snapdragon is a custom implementation of the ARM7 instruction set - it i not based on the Cortex A8 core, but does use the same instruction set.
Regards,
Dave

Why doesn't the Tegra3 One Xhave LTE?

So I tried searching why the Tegra3 variant doesn't have LTE and the answers are more like "because the lte radio isn't compatible", I'm wondering why exactly is it not compatible?
Same goes for the SIII, it also has a LTE variant(Dual core) and a quad-core chip without LTE.
Its not like I'm suffering from the lack of LTE, its just curiosity.
Anyone ?

death__machine said:
So I tried searching why the Tegra3 variant doesn't have LTE and the answers are more like "because the lte radio isn't compatible", I'm wondering why exactly is it not compatible?
Same goes for the SIII, it also has a LTE variant(Dual core) and a quad-core chip without LTE.
Its not like I'm suffering from the lack of LTE, its just curiosity.
Anyone ?
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qualcomm LTE radio isn't and qualcomm wasn't helpful to Nvidia to integrate it with Tegra
so Nvidia had to make an LTE radio on its own hence the imminent Tegra 3+

Qualcomm wasn't helpful about it to Nvidia? Wow okay. So I assume the current LTE radios are by qualcomm only then.
Found a link explaining the snapdragon(in the lte variant of one x and s3). It includes everything basically, the processor, radio, etc. The Exynos Quad and Tegra3 don't include a LTE radio.
http://www.ibtimes.co.uk/articles/350403/20120609/samsung-galaxy-s3-exynos4-snapdragons4-variant.htm
From what I've read till now, people seem to be more happy with the dual-core S3 than the dual-core one x. Anyways Tegra3+ ought to fix that, its actually gonna be phone raping everything then lol! LTE, higher clocks, less nm manufacturing?

not most likely it will not be an nm shrink
Today, NVIDIA announced that their Icera 410 LTE modem has been approved for use in tablets and clamshell devices on AT&T’s network. While that does not mention smartphone use yet, this is a step towards LTE and Tegra 3 coming to the States in at least some form. As we have documented plenty of times, NVIDIA has been unable to pair its quad-core mobile processor with LTE because its biggest competitor (Qualcomm) is the only guy making LTE modems at this time and likely does not feel like sharing. With today’s approval, this should bring NVIDIA up to speed in no time (assuming they get the smartphone approval too).
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http://www.droid-life.com/2012/05/2...-nvidias-icera-410-lte-modem-approved-by-att/

I wonder if they'll do something like what Apple does and offer a subsidised trade-in for T3 HOX to T3+ HOX.

I don't think HTC can afford to, however much I would love to be able to

Exynos vs Snapdragon

I got involved in a discussion in another forum that's turned into why the North American Galaxy series has a Snapdragon and not the Exynos. What are your thoughts?
Mine comes from the Sprint S2, we were told it had the Exynos because of WiMax. The Exynos wasn't compatible with the LTE modem at the time so everyone else had the Snapdragon. Now, its due to energy issues and it sucking the battery because of, I can only assume, compatibility issues. Yet, the Note 3 has the Exynos and can use LTE, right?
So what gives? I don't care about which SoC is better - that would go on for months. Just the reason behind the choice.
Sent from inside the matrix

T-Mobile note 3 has snapdragon 805 I think. Actually I think all variants do. I always read that snapdragons were actually better in performance standards and architecture of chip is why. Even though exynos may have a higher clock rate the snapdragons actually do calculations "better". Back when one of the galaxy series came out, I watched countless YouTube explanations explaining which is "better". As to why they use one in a us brand versus international version, no idea.
Sent from my SGH-M919 using Tapatalk

I don't think we'll ever know, honestly. For every article I point out showing why my reasoning is correct, there's another stating the complete opposite. I thought there was some plausibility to it being about money but my Exynos phone wasn't any more expensive than the Snapdragon version. Then there was the conspiracy theory about carriers controlling what SoC's go in phones, time travel, Kennedy. There might be a shred of truth in that story I'm just not sure where. Oh internet...
I liked my S2 but I have to say, the Snapdragon has always been a beast (you can OC the hell out of them too) and there's way more development support with them.

Someone once told me that Qualcomm has intellectual property rights to certain CDMA LTE modem technologies in the USA. This especially applies to CDMA phones for Sprint and Verizon. If that is true, then it is cheaper for Samsung to use Qualcomm LTE chips since using Exynos LTE chips would require a licensing agreement with Qualcomm.
Edit: I found this article that explains it: http://www.tmonews.com/2012/05/editorial-why-a-snapdragon-s4-galaxy-s-iii-is-awesome/
Excerpt:
"But if you are thinking that other carriers will get SoCs other than Qualcomm’s in the future, you’d probably be wrong. Most LTE modems do not support U.S. Digital Dividend frequencies, which means the LTE networks of AT&T, Verizon Wireless, and most regional carriers will be stuck with Qualcomm’s modems. T-Mobile can use non-Qualcomm LTE modems because the AWS band T-Mobile is using is a standardized band that is well-supported. Verizon Wireless, Sprint, and most regional carriers operate CDMA2000 networks, which means they have no choice but to use Qualcomm’s modems, since no one else makes CDMA2000 modems because Qualcomm owns all the IP rights to the cdmaOne/CDMA2000 technologies. Maybe once CDMA2000/LTE carriers start offering devices that don’t support CDMA2000, then we’ll see non-Qualcomm Snapdragon LTE devices on those networks, provided that U.S. Digital Dividend, ESMR+Cellular 850, and Extended U.S. PCS bands are all supported by non-Qualcomm modems by then."
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