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gsm 900 repeater design
first hello to all, it should be my first post here...im trying to design a gsm 900 repeater with this scheme:directive antenna --> lna --> amp+agc --> pa --> omni antennadirective antenna <-- amp <-- amp+agc <-- omni antennath...
RF, Microwave, Antennas and Optics :: 04 May 2008 7:13 :: DDavid :: Replies: 6 :: Views: 489
improve gsm antenna
hi alli bought a gsm module for send sms . and i want send sms to another modem that it located in desert!!!!!!!!! so , there, we doesnt have any antenna . i want send sms and transmit data to that modem . how can i improve the antenna? can i use the...
RF, Microwave, Antennas and Optics :: 03 May 2008 8:24 :: vfone :: Replies: 3 :: Views: 174
gsm antenna ???
hi all,can any one tell about gsm antenna sales company /price or only price???thanks...
Business Special Interest Group :: 29 Apr 2008 12:01 :: james cook :: Replies: 2 :: Views: 452
using gps for tracking(30 points to who helps)
hi,i have thought of an idea for tracking packages using gps.my father owns a transport company and we are thinking of implementing it for our company.here is the idea( which i also sent to nasa design contest) with the block diagram-http://www.creat...
Hobby Circuits and Small Projects Problems :: 27 Apr 2008 10:37 :: headstrong :: Replies: 23 :: Views: 2431
compact pifa design for gsm/dcs
im looking for a compact pifa design for dual band operation, gsm/dcs..anyone has any reference??thanks......
RF, Microwave, Antennas and Optics :: 26 Apr 2008 3:00 :: yaojianhai :: Replies: 10 :: Views: 987
triple-band antenna help
hi,i am designing a triple-band antenna for both gsm900/1800 and bluetooth, and i want to know which antenna is suitable for such antenna whose gain is also required to be 2dbi plus. now i choose one folded pifa, which works for gsm/dcs/bluetooth tri...
RF, Microwave, Antennas and Optics :: 26 Mar 2008 4:46 :: balaguru thavamani :: Replies: 6 :: Views: 342
yagi antenna
can somebody please help me in building a simulation for yagi antenna in hfss for gsm band i.e 900mhz and 1800mhz....
RF, Microwave, Antennas and Optics :: 19 Mar 2008 20:20 :: khawar shafiq :: Replies: 2 :: Views: 399
low frequencies vs high frequencies
hello eda members,i m new to edaboard n i start with a really silly question which i know is the basic of communication,i want to know that from you people that why we need modulation other then reason for multiplexing,its usually say that low freque...
RF, Microwave, Antennas and Optics :: 18 Mar 2008 8:27 :: mathuranathan :: Replies: 8 :: Views: 231
wht the gain of helical antenna simulated by hfss is wrong?
i simulate a gsm dualband helical antenna in hsff. but the peak gain and directivity computed by hfss is always below -10dbi, this is obviously wrong, and the radiated power always large than the accept power, how it can be? but the radition pattern ...
Electromagnetic Design and Simulation :: 16 Mar 2008 16:38 :: hgc1979 :: Replies: 1 :: Views: 327
ADS
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multi band base station antenna
hey.......i am to design a multi band base station antenna that could resonate at different frequencies like gsm, cdma, umts and wimax.....i have decided to make a dipole patch antenna to achieve a frequency band of 2-4 ghz....so now i need some gui...
RF, Microwave, Antennas and Optics :: 05 Mar 2008 17:24 :: Arsalan Ali Khan :: Replies: 1 :: Views: 246
which will cover more distance: low or high freq. signal??
hi friends...can any body plz explain to me that which type of signal will cover more distance: low frequency signal or high frequency signal?? and why so??...
Digital communication :: 20 Feb 2008 7:21 :: spikeyang :: Replies: 27 :: Views: 645
design dual frequency microstrip patch antenna using awr
ive problem to get dual frequency at the same time.. my resonsnt frequncy is 0.9 ghz & 1.8 ghz.(gsm application)anybody can help me..this is my final year project..tq...
RF, Microwave, Antennas and Optics :: 04 Feb 2008 15:21 :: tyassin :: Replies: 2 :: Views: 184
type of modulation used in smart antenna system
what type of modulation is suitable for the smart antenna systems?normally qpsk , bpsk, qam are used. why shouldnt it be fsk?...
Electromagnetic Design and Simulation :: 12 Jan 2008 16:56 :: laseetha :: Replies: 2 :: Views: 102
a question about repeater
le with understanding repeater. have you ever thought about the scene that the ue signal level at the repeaters antenna port is static sensitivity level, such as -104dbm with -121dbm noise level for gsm. after the amplification of the repeater, the ...
RF, Microwave, Antennas and Optics :: 30 Dec 2007 14:49 :: springf2000 :: Replies: 1 :: Views: 127
bmw cars !!!!!! its antenna ??????????
hi all i guess all of use notice the radio antenna in the bmw cars , it is so short less than 5 cm i guess ?? does any one have idea about such antenna how it works & does it need a certain radio ??? thx all...
RF, Microwave, Antennas and Optics :: 30 Dec 2007 1:37 :: jinhaozi :: Replies: 5 :: Views: 631
antennas query
i want to know how many types of antennas are used at bts in gsm network....
RF, Microwave, Antennas and Optics :: 05 Dec 2007 7:22 :: balaguru thavamani :: Replies: 4 :: Views: 504
gsm [hlp]
hii want to know the power level of gsm signals in different points in a cell. is there any difference between power level of control signals and other signals? pls explain....
Digital communication :: 28 Nov 2007 21:32 :: Kryptonite :: Replies: 15 :: Views: 492
looking for pifa antenne designd dual band
le printed on the board and mounted above a large ground plane. i have a large ground plane available, for 868 mhz it looks like several wavelengts. the antenna should able to cover: 868 mhz, 900 mhz gsm and 1700 - 1800 mhz bands.thanks in advance.ps...
RF, Microwave, Antennas and Optics :: 23 Nov 2007 22:01 :: mmansuri :: Replies: 3 :: Views: 348
gsm signals [hlp]
hiim a beginner in gsm. pls write for me about different signals in a gsm system. has anyone any document about standards of gsm signals? pls upld....
Digital communication :: 17 Nov 2007 9:29 :: elec350 :: Replies: 5 :: Views: 237
sdr
hey guys :what is sdrsoftware defined radio? and what is its importance at the mobile network ?thanks in advance......
Digital communication :: 11 Nov 2007 3:59 :: angu :: Replies: 6 :: Views: 567
gsm chip
hello everyone,i need a gsm chip that i can use in an embedded system, i intend to design the rf system with a suitable antenna on a pcb.can anyone help with suitable chips that i can use?thanks in advance :)...
RF, Microwave, Antennas and Optics :: 09 Nov 2007 1:32 :: vfone :: Replies: 1 :: Views: 207
difference between gsm900 and gsm1800
i want to know their difference and not their spectrum difference please....
Digital communication :: 06 Oct 2007 19:11 :: saabiaan :: Replies: 11 :: Views: 613
extraction power from gsm
hellohow much voltage can induce at the gsm antena? how much electrical power can be extracted from 3 range gsm?regards...
RF, Microwave, Antennas and Optics :: 06 Oct 2007 14:41 :: vfone :: Replies: 5 :: Views: 222
discussion about setup for antenna rl and gain measurement
hi guys,im searching for someone that can once and for all give me the right way to measure antenna rl and gain. now...im not interested in the method...i know it but the correct setup. i mean..when i want to measure rl of a small antenna, take as an...
RF, Microwave, Antennas and Optics :: 31 Aug 2007 15:44 :: jallem :: Replies: 3 :: Views: 297
help for searching about antenna
hi all,can any body tell me if there exist an antenna having the following specification:dual band (850,1900), dual polarized, directional , small size?and from where can i buy such antenna?best regards,...
RF, Microwave, Antennas and Optics :: 27 Aug 2007 11:48 :: comm2006 :: Replies: 2 :: Views: 108
sim508--gsm antenna pad
hi,i`m so newbie in this field ( antennas,rf..etc )in sim508 gsm module there is antenna spring connectors(which can be connected to coaxial cable to antenna ) and antenna pad ( shown in the photo below)can i connect chip antenna to sim508 module?.....
RF, Microwave, Antennas and Optics :: 12 Aug 2007 13:56 :: abdalla :: Replies: 0 :: Views: 270
network design for gsm system
if new operator wants to lunch a gsm mobile system then what are the factor that he has to consider.? how can he make network planning for given area means how to calculate how many bts (cells) required to cover the given area. what is the role of fa...
Electronic Elementary Questions :: 10 Aug 2007 3:18 :: kengloong :: Replies: 3 :: Views: 234
mobile_antena
is anyone who knows what kind of antena is use in mobile telecomunication????...
RF, Microwave, Antennas and Optics :: 20 Jul 2007 6:46 :: tomcat_x :: Replies: 6 :: Views: 534
gsm in-band spurious induced by flex pcb
hi all,i met a issue with ?inband spurios around 500~700mhz wideband noise coming up. its for sure is flex pcb that connect to main pcb make it instead any other radio module/pa/rf driver issue.could anybody giveme a guide how to trace it or if neces...
RF, Microwave, Antennas and Optics :: 29 Jun 2007 1:29 :: RFDave :: Replies: 2 :: Views: 195
satellite uplink and downlink
as we all of know that uplink frequency of satellit is greater than its downlink frequency. can anybody explain me why this is so....
Electronic Elementary Questions :: 22 Jun 2007 7:04 :: ricksidd :: Replies: 15 :: Views: 474
fading??
is fading always bad? can fading be ever utilized for any benefit?...
Digital communication :: 21 Jun 2007 8:41 :: Naveed Alam :: Replies: 10 :: Views: 681
inverted-pifa simulation result from book different from ads
hi,guys im tasked to design a low-profile small printed antenna that operate in 915mhz for gsm application. i have this book planar antennas for wireless communications by kin lu wong. there was a reference design on cpw-fed pifa. what i have is ads ...
RF, Microwave, Antennas and Optics :: 12 Jun 2007 8:17 :: jaisson :: Replies: 4 :: Views: 723
isolation btw gsm and gps antenna
how much isolation should have between gsm and gps antenna ?thanks a lot....
RF, Microwave, Antennas and Optics :: 07 Jun 2007 2:27 :: RFDave :: Replies: 2 :: Views: 165
help evaluata antenna performance
hi buddies, attachment is one pifa antenna for two band 900/1800(or 850/1900),the performance spc is as below: egde/gsm trp:29 , tis :-104 dcs/pcs trp:27, tis:-104 sar meet two standard;if we u...
RF, Microwave, Antennas and Optics :: 26 May 2007 2:57 :: redvalorm :: Replies: 0 :: Views: 363
nokia n series antenna design
i need antenna design for nokia n70, n73, n80 and n90....
RF, Microwave, Antennas and Optics :: 23 May 2007 10:33 :: ceg :: Replies: 8 :: Views: 546
what's the maximum interfere level at antanna in air
for example, maximum gsm, cdma wcdma and wlan etc.is there anybody knows the exact value of them??...
RF, Microwave, Antennas and Optics :: 19 May 2007 17:53 :: RFDave :: Replies: 4 :: Views: 405
handset phone antenna
hi, does anybody know any handset phone multi-band antenna design or from where can i get such design? mainly to cover the gsm, 3g and wifi applications. thanks,...
RF, Microwave, Antennas and Optics :: 19 May 2007 14:26 :: bmn123 :: Replies: 3 :: Views: 390
multi-band compact phone antenna
how to design multi-ban handset antennas?its works bands includes: gsm850,gsm900,dcs1800,pcs1900 quad-gsm band and 2010-2015mhz bnad.research good suggestion!thanks and best regards!joanhuo...
RF, Microwave, Antennas and Optics :: 15 May 2007 8:10 :: eecly :: Replies: 3 :: Views: 432
double the frequency of an antenna.
hello.i know nothing about antennas, nothing at all.my problem is that i am designing a gsm system with a very small antenna, this antenna requires a pcb pad that has 50 ohm impedance (did i say that correct?).this antenna is for the a range of 880 -...
RF, Microwave, Antennas and Optics :: 10 May 2007 13:16 :: Virus King :: Replies: 2 :: Views: 429
help required for a gsm interview....
can someone please help me prepare for a job interview for gsm (an operator company)....if someone can provide me with some material regarding preparartion for the job interview , that shall be great. + suggestion for the most imporatant question for...
RF, Microwave, Antennas and Optics :: 10 May 2007 13:07 :: Virus King :: Replies: 1 :: Views: 426
are antenna gain values reliable in hfss simulations?
hi,ive an interesting question. could anyone tell me if, when simulating antennas on hfss, you have obtained gain values that are reliable if compared with measured ones?ive done a lot of different models of antennas in hfss and also the same models ...
Electromagnetic Design and Simulation :: 04 Apr 2007 14:04 :: ifelix :: Replies: 5 :: Views: 594
difference b/n gsm at 900mhz and 1800mhz
hi friends, i find some where that we are using gsm band at 900mhz and 1800mhz ranges .1) is there any difference between those two ranges ?2)bandwidth increases if we go for higher band i.e 1800mhz ?plz clarify me.thanks in advancepravee goud...
Digital communication :: 18 Feb 2007 12:34 :: smshd :: Replies: 2 :: Views: 222
gsm transmitted power from bts
why is the transmitted power from bts to a mobile phone higher in gsm900, as compared to gsm1800?e.g.gsm900 transmitted power from bts: 39dbmgsm1800 transmitted power from bts: 36dbmhow do we explain this?...
Digital communication :: 13 Feb 2007 20:36 :: gied :: Replies: 5 :: Views: 366
wimax capacity
can somebody enlighten me as to how the capacity has been calculted for wimax when it is said that a maximum of 35 mbps is achievable for a 64 qam over 7 mhz bandwidth.2. how the coverage distance can be increased by lowering the frequency used.as a...
Digital communication :: 10 Feb 2007 19:07 :: melc :: Replies: 6 :: Views: 705
gsm/gprs modem hang problem
hi, all,i am testing the siemens gsm/gprs modem module mc35i. everything works fine until one day the modem just hang there although it is still responding to my at command. but it can not dial any more. when i try to send a message, it returns a err...
Professional Hardware and Electronics Design :: 10 Feb 2007 6:57 :: mitesh :: Replies: 13 :: Views: 2946
fractal antenna for cellular phones
hi,is it possible to use fractal antennas to design multi(triple)band antenna for handheld cellular phones, in the gsm 850,900 and 1800 bands??abhi...
RF, Microwave, Antennas and Optics :: 05 Feb 2007 10:51 :: emonnos :: Replies: 10 :: Views: 783
cell phone jammer
hi,.. ive build a circuit to jam the ir signal from a tv remote control, and now i want to do the same thing with cell(mobile) phones. what i ask about:1- is it possible.?2- how can i do it.?3- is it legal.?4- if its illegal, could i make it legal.?...
RF, Microwave, Antennas and Optics :: 20 Jan 2007 1:53 :: khouly :: Replies: 3 :: Views: 756
in the gsm network, how many channel found in one cell? on w
in the gsm network, how many channel found in one cell? on wha t it depends?and what is the difference between the channel and the voice channel (the width of each), and how many voice channel can be in one cell of gsm. and how many calls the one cel...
Digital communication :: 18 Dec 2006 9:01 :: danielle_brandon :: Replies: 12 :: Views: 684
rfid based attendance register
hai alli would like to design an rfid based attendance registerwhere i need a read range of 1-1.5 meterthe tags caould be active or passivethe main hurdle i think is antenna designi would like to get some inputs from the peoplewho had experiance on t...
Microcontrollers :: 05 Dec 2006 3:47 :: artem :: Replies: 5 :: Views: 414
why rf
why is there now a trend ,tat people are talking about rf design so much,,how different is it from our circuit design approach,,why are we coining a separate name for it,,is it like its potetial has been discovered lately and is found to be advantage...
Analog Circuit Design :: 30 Nov 2006 10:26 :: omnius :: Replies: 3 :: Views: 168
handphone signal strength
i am a electronic nobbies. do anyone know any simple circuit that works that can enhance my handphone receiving signal to fullest when i am in the rural area? thanks...
Hobby Circuits and Small Projects Problems :: 26 Nov 2006 15:03 :: dz99 :: Replies: 11 :: Views: 294
what is the best antennas to transmit 900mhz//1800mhz gsm
hi there,can anybody help out in wat kinda antenna type is best to transmit 900mhz/1800mhz gsm signals for a project.also on wat kinda other devices that cld work well with the circuitry.i am thinkin of using a monopole antenna...i need to know the ...
Professional Hardware and Electronics Design :: 07 Nov 2006 11:01 :: dejumotalks :: Replies: 2 :: Views: 234
mobile base antenna radiation patterns and effect on human
how do i simulate the radiation patterns of the mobile base station and whcih simulation tool is the favourite.what are the real effects of radiation from the mobile base station antennas on human coexistnce near this stations locations....
RF, Microwave, Antennas and Optics :: 26 Oct 2006 3:40 :: RayFEKO :: Replies: 5 :: Views: 315
not very elementary
<p>this isnt a very elementary question, but i didnt know where to post it.</p><p>my name is theron luhn. im 13 years old and in seventh grade. each year we have this competition called the <a href=http://www.christophercolumbu...
Electronic Elementary Questions :: 26 Oct 2006 1:29 :: newelltech :: Replies: 9 :: Views: 534
keypad rf immunity
hello rf modem based design includes keypad and connection between keypad to pcb is done by 10-20 cm wires. to reduce costs keypad scan is done by microcontroller directly. due to rf modem operates something around 900 mhz there could be problem w...
Professional Hardware and Electronics Design :: 12 Oct 2006 8:26 :: spikeyang :: Replies: 1 :: Views: 174
gsm bts rf component description
i want to know about the function and differences between :combinerduplexerdiplexerplease help...
Digital communication :: 02 Oct 2006 13:36 :: hossam.algewely :: Replies: 2 :: Views: 348
simcom's sim100 gsm modem problem
hi, i am using simcoms sim100 gsm modem.it get power on properly but not get register to network.what could be probable cause.tramp...
Digital communication :: 21 Sep 2006 8:50 :: pisoiu :: Replies: 4 :: Views: 1017
improving isolation in a dual fed air dielectric patch.
hello everyone, im designing a dual probe fed patch antenna with air dielectric for the lower gsm band. although i get a very good radiation pattern and decent return loss, the isolation between the two ports is only about 12 db at the higher end of ...
Electromagnetic Design and Simulation :: 21 Sep 2006 5:41 :: ananth :: Replies: 3 :: Views: 195
antenna switch duplexer diplexer
i am a little confused with antenna switch,duplexer and diplexer.does anybody know the principle of these,and whats the difference between themthanks...
RF, Microwave, Antennas and Optics :: 13 Sep 2006 19:49 :: usman_akramz :: Replies: 7 :: Views: 1170
gsm module project
im imterfacing a gsm module/engine to my µc project. if signal strength is low, the module will de-register itself from the network. several times, i find that the signal strength have recovered to full but the module fail to call-out or receive a ca...
Digital communication :: 05 Aug 2006 4:45 :: planet69 :: Replies: 2 :: Views: 345
help design gsm phone directional antenna
i need help to design an antenna to be used on gsm phone this antenna must directional with best gain to make a link between to location average 30 km distance and with usual material any software or paper to do that thanks...
RF, Microwave, Antennas and Optics :: 24 Jul 2006 6:23 :: sohail_akram :: Replies: 12 :: Views: 1473
hardware design of dual band polygonal patch antenna
hii am currently doing a project of the design of a dual band polygonal patch antenna for gsm and umts.i have finished designing the antenna with ansoft designer program.now i have to build the microstrip antenna which i have simulated.can any one p...
RF, Microwave, Antennas and Optics :: 13 Jul 2006 5:46 :: ranggi_raj :: Replies: 2 :: Views: 276
designing dual band polygonal patch antenna
hican anyone pls guide me in using ansoft designer in creating a dual band polygonal patch antenna for gsm and umts. i would be using fr4 antenna material...
RF, Microwave, Antennas and Optics :: 07 Jul 2006 15:30 :: ranggi_raj :: Replies: 0 :: Views: 213
umts
salam(means peace) everybody:dplease what is the difference between the bts in gsm and the b node in umts?thanksemg...
Digital communication :: 27 Jun 2006 9:17 :: emg :: Replies: 4 :: Views: 402
yagi antenna for 1.9 ghz cdma/pcs
hi,i want to made a yagi antenna for 1.9 ghz cdma/pcs can any one help me please? in detailthankssadat...
RF, Microwave, Antennas and Optics :: 03 Jun 2006 12:56 :: aliraza :: Replies: 8 :: Views: 882
a simple question about dual band radio front end
hi, i have a simple question about the architecture of dualband radio front-end (for example: gsm900 and gsm1800).supposed the antenna is dual-band, does the conventional radio front-end operates at two frequency band simultaneously? if yes, so the r...
RF, Microwave, Antennas and Optics :: 22 May 2006 6:44 :: noiseless :: Replies: 1 :: Views: 147
gsm network coverage
hi everybodyi want to know about gsm network coverage in underground railway.anyone cand help me....
RF, Microwave, Antennas and Optics :: 05 May 2006 15:44 :: a_bove :: Replies: 11 :: Views: 960
u-slotted microstrip patch antenna info
nas with u type slot/s and probably the fully- or partially- edge shorted compact versions of u-slotted patchs. i have to work out some really compact and wideband/multiband base station antennas for gsm/dcs/pcs applications by this week for my proje...
RF, Microwave, Antennas and Optics :: 12 Apr 2006 6:06 :: akedar :: Replies: 1 :: Views: 228
dect distance limit
i know that in gsm the maximum distance range between mobile and bs is 35km (delay reason). does anybody know what is the distance limit in dect? (assuming that is enough power and antenna gain to maintain the link budget)....
Digital communication :: 02 Apr 2006 8:47 :: RiffMaster :: Replies: 4 :: Views: 993
sms gsm socket modem
dear all,i am looking for sms gsm socket modem for my project, i have found one in germany but it will take from 6 to 8 weeks to be avaliable.i am looking for a part like the below one :http://www.hy-line.de/fileadmin/hy-line/communication/herstelle...
Digital communication :: 28 Mar 2006 13:31 :: wshibl :: Replies: 2 :: Views: 567
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