Help with GSM frequencies? - General Topics

I think i know what the frequencies are of mobile telephones are, but i don’t understand what the range they are in?
Are the UHF
or VHF
will a general antenna, which has a decent VHF and UHF frequency response say
Transmit frequency: 144-146 & 430-440 MHz
Receiving frequency: 25-2000 MHz
will this work with a mobile phone?

hum, not getting much help with this one........ Anyone?

google knows all
http://www.audio-technica.com/using/wireless/advanced/
If the wireless equipment will be used in different cities, VHF systems operating on the special frequencies in the 169-172 MHz range will be a good economical choice. However, these frequencies, which are sometimes referred to as "traveling frequencies," are very popular, and are not a good choice for situations where large numbers of wireless systems are likely to be present, such as at trade shows and expositions. In such situations, UHF systems in the 944-952 MHz band will be a better choice.
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thanks for the response but that hasnt really made it clear.
I can see that UHF has less of a interferancve problem and that
"In such situations, UHF systems in the 944-952 MHz band will be a better choice."
however, does this mean that the frequency in the of 900 is UHF?
does this make mobile phones UHF devices?
which means any anntenna will work?

i'd say yes
http://www.hard-core-dx.com/nordicdx/antenna/special/
read about antenna's
it's all about lenght when it comes to antenna's really that is unless it have some soft of bandpass filter in the end

I have figured it out thanks for the help
Cheers
JIM

Related

2009 version of Touch Cruise????????????

http://www.mobiledia.com/phones/htc/touch-cruise-2009.html
Q2 of 2009 on a NEW Polaris/Touch Cruise?? i don't see anything special or different.
Processor Qualcomm® MSM7225™, 528 MHz <- That's different enough...
Operating System Windows Mobile® 6.1 Professional
Memory ROM: 512 MB RAM: 256 MB
Dimensions 102 X 53.5 X 14.5 mm (4.02 X 2.11 X 0.57 inches)
Weight 103 grams (3.63 ounces) with battery
Display 2.8-inch TFT-LCD touch-sensitive screen with QVGA resolution
Network HSDPA/WCDMA:
Europe/Asia: 900/2100 MHz
Up to 384 kbps up-link and 7.2 Mbps down-link speeds
Quad-band GSM/GPRS/EDGE:
850/900/1800/1900 MHz
(Band frequency and data speed are operator dependent.)
Device Control HTC TouchFLO™
4-Way Navigation Wheel with Enter button
HTC Footprints™ button GPS Internal GPS antenna
A-GPS capable (service provided by Google)
Connectivity Bluetooth® 2.0 with Enhanced Data Rate and A2DP for stereo wireless headsets
Wi-Fi®: IEEE 802.11 b/g
HTC ExtUSB™ (11-pin mini-USB and audio jack in one), full-speed USB 2.0
Camera 3.2 megapixel color camera with fixed focus
Audio supported formats AAC, AAC+, eAAC+, AMR, AWB, QCP, MP3, WMA, WAV, MIDI Video supported formats WMV, ASF, MP4, 3GP, 3G2, M4V, AVI
Battery Rechargeable Lithium-ion battery
Capacity: 1100 mAh
Talk time:
Up to 375 minutes for WCDMA
Up to 400 minutes for GSM
Standby time:
Up to 400 hours for WCDMA
Up to 330 hours for GSM
(The above are subject to network and phone usage)
Expansion Slot microSD™ memory card (SD 2.0 compatible)
AC Adapter Voltage range/frequency: 100 ~ 240V AC, 50/60 Hz
DC output: 5V and 1A
Special Features
Includes proprietary in-car holder
Photo geotagging
Also here:
http://www.gsmarena.com/htc_touch_cruise_09-2654.php
oooo... i see i see...
very interesting.
No US 3G. Lame.
Europe/Asia: 900/2100 MHz
For Canada, US, South Americas, Australia, South Africa - that's enough to make it almost useless ... no 850Mhz
Ya, NO 3G in US makes this phone crap. I own the original Touch Cruise because it was a tri band 3G phone.
I have noticed that most of the new phones HTC is putting out lack the 3G North America, what gives?!!!
ianl8888 said:
Europe/Asia: 900/2100 MHz
For Canada, US, South Americas, Australia, South Africa - that's enough to make it almost useless ... no 850Mhz
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umm. only works on parts of the australian networks!
darkazally said:
I have noticed that most of the new phones HTC is putting out lack the 3G North America, what gives?!!!
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Click to collapse
Just a theory, but if you look at their 2009 lineup leak, at least the one that sorta specifies that certain phones are targeted at specific networks in the US...I kinda get the feeling that they want to make sure that certain models that are headed to the US will be the only ones that those in the US are using. It probably isn't a long term strategy, but it makes a little sense to see how well they suited they are for the US market using their own name.
I wouldn't be surprised if they also release a non-subsidized US-centric model that is superior to the carrier models, just as a test to see if they have to rely on carrier subsidies or if they can be successful without playing ball with the carriers exclusively. I suspect this is part of the reason the Diamond was eventually released in a US 3g friendly build.
It's only because of the US carriers... they don't give you enough freedom, as like the carriers in europe... sure we get branding, and network locks, but that's all there is... we didn't deviate from the Asian standards as the US market did oh so long ago...

[Q] comparing CPU performance

I was hoping someone could help me find a set of metrics to compare the performance of mobile CPUs (mainly powering PDAs and smart-phones). I have a bunch of attributes for each CPUs, including their architecture and clock speeds. However, I understand that it would be misleading to compare CPUs using clock speeds, as these mean different things across different architectures. Do you know of any concordance tables (1 Mhz in family “X” equals n Mhz in family “Z”)? Do you know of any commercially available survey that compares CPUs using benchmarking software? Many thanks for your help!

[Q] Recommendation for "no-name" cell phone

G'day
Yesterday, my SG4 I9505 fell down a flight of stairs and broken into sizable pieces. I went on to look for a new phone that might be a good match for my "old" broken one. Since I currently live in Switzerland, I'd like to have a recommendation for a phone which matches the LTE 4G frequency used by the providers here, though I'm frequently traveling to the USA and sometimes to Asia (though I normally just buy a replacement phone for the duration). While searching through the net, I eventually hit alibaba.com and browsed through the manufacturers there, in hope to find a cool combination of hardware for my new replacement phone. What I would really like is the following (could be more or more specific, once helpful people reply):
A really fast CPU (low power consumption). Of course, the word good is very unspecific here.
3000+ up to 4000mAh battery
A brilliant 1080p display with vivid colors, with good contrast ratio
Fast and accurate GPS, a-GPS
GSM, 3G, 4G, LTE with the according frequency bands necessary to connect to various providers in Europe, mainly Switzerland. Why can't we have programmable chips which adapt their frequency for the cell connectivity? I currently have 100Mbit/s download and 10Mbit/s upload, so I'd like to continue using this as my main mobile Internet access
Rootable Android (easily upgradeable to newest versions)
Advanced audio chip
Dual SIM
Moderately good lens (I very much prefer lower MPixels but enhanced IS and really working in low-light given the physical constraints)
All the goodies of the normally used SoC CPUs
Aluminium alloy
2-4GB RAM
At least 32GB space
Wifi
Accelerometer, gyro, proximity, compass, barometer, temperature, humidity, gesture
Has anybody tested any of these hundreds of new Chinese and Korean mobile phones or has some experience with no-brand phones?

Suggestion for no frills phone on Tmobile supporting 700mhz VoLTE?

My Galaxy S4 Mini just burned out on me. I am trying to find a good flexible phone that will support 700mhz to give me better coverage in my rural area. Trying to find models with these features:
1. smaller is better (ideally less than 5", 4.0" is GREAT )
2. rootable/ROMable
3. 700mhz/VoLTE capable (band 12)
4. $350 or less (used is ok)
5. able to tether (often work on the road from laptop)
6. ok battery life (willing to flash to improve)
7. dont care about camera pixels, or the 4k screen res, or ppi - these are all fluff
I am a no frills person, my phone is a utility item, not a toy... but the market appears to be overflowing with toys and pocket TVs now, and manufacturers are being paid to build what carriers want, especially if it limits our options on phones, someone please help me solve this problem ;(
Here are some known 700mhz phones:
http://www.spectrumgateway.com/compatible-phones
Are any of those worthy??
Please search before posting, a thread exists for this here:
http://forum.xda-developers.com/showthread.php?t=1846277
Thread closed.

Pixel 2 supports 256 QAM, 4x4 MIMO and 3xCA but no Gigabit LTE?

I'm trying to wrap my head around why the Pixel 2 and Pixel 2 XL do not support Gigabit LTE and are rated as Cat 15 devices with theoretical download speeds of 800mbps on LTE. The phones have this rating albeit supporting the technologies needed for Gigabit LTE: 256 QAM, 4x4 MIMO and 3xCA.
See these links outlining what is required for Gigabit LTE.
"In short, Gigabit (Category 16) LTE is 256 QAM, 3x20 MHz CA, and 4x4 MIMO."
techspot.com/guides/1328-gigabit-lte-explained
"The key features enabling Gigabit LTE include: Carrier Aggregation (3 component carriers is minimum)...4x4 MIMO...256 QAM"
ericsson.com/ourportfolio/networks-products/gigabit-lte?nav=fgb_101_0561%7Cfgb_101_0517%7Cfgb_101_0822
Yet, on Google's official Pixel 2 specs it says "Supports up to CAT 15 (800Mbps DL / 75Mbps UL), 3x DL CA, 4x4 MIMO, 256-QAM DL and 64-QAM UL depending on carrier support"
store.google.com/product/pixel_2_specs
I'm curious why Google would list the specs at Cat 15 instead of Gigabit LTE/Cat 16. I know in real life this does not mean much and the Pixel 2 phones will do fine on most networks. My question is not about impact on real world performance but why the specification is lower albeit the necessary LTE-A technologies being installed. The only reason I can think of is that the Pixel 2 phones do not support 4x4 MIMO on Sprint so Google spec'd to the lowest common denominator. That does not sound like a good reason though. Any thoughts?
Could be that they support those technologies, but not all together which makes gigabit LTE possible. As to why though, I have no idea.
Likely licensing. They saved some $$ by not buying the licensing for something that isn't practical at this point in time. Same for Qualcomm Quickcharge. Manufacturers must pay a licensing fee to Qualcomm if they want to use it even though the hardware is capable.
I wonder if it will change with a software update if it's the x16 modem just like how carrier aggregation was disabled on the pixel with T-Mobile in the beginning. On a side note does the pixel 2 support lte u/laa? I know the original pixels modem technically supported it but was never enabled. I saw no mention of lte u in the specs
l7777 said:
Likely licensing. They saved some $$ by not buying the licensing for something that isn't practical at this point in time. Same for Qualcomm Quickcharge. Manufacturers must pay a licensing fee to Qualcomm if they want to use it even though the hardware is capable.
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This ^^
l7777 said:
Likely licensing. They saved some $$ by not buying the licensing for something that isn't practical at this point in time. Same for Qualcomm Quickcharge. Manufacturers must pay a licensing fee to Qualcomm if they want to use it even though the hardware is capable.
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Agreed, most likely the cause.
Although could easy be added later in a software update and/or hack.
hi, my Pixel 2 xl qam 256 is not enabled, how to enable it? Thx

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