walid Posted September 6, 2005 Report Share Posted September 6, 2005 Please I want anything about Wireless telephones, how they work, block digrams, schematic...anything. I have to understand this subject. thank you all for ay help. Quote Link to comment Share on other sites More sharing options...
walid Posted September 7, 2005 Author Report Share Posted September 7, 2005 just plain cordless phones, i have one i need to repair it or at least understand its different circuits. Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 8, 2005 Report Share Posted September 8, 2005 Hi Walid,Here, http://electronics.howstuffworks.com/cordless-telephone.htmis a pretty good explanation of the history of cordless phones in America. There are many different ways of modulation over the years and I think they are wrong about the 1st cordless phones: My 1st cordless phone used FM for the handset to transmit to the base at 27MHz, and AM for the other direction at about 1.8MHz. The handset had an AM radio's loopstick antenna in it for it to receive.It stopped working and I didn't have a clue what was wrong. I simply guessed that the quartz crystal in the handset was broken, went to the manufacturer to purchase one and it worked! I think the crystal cost 2 bucks. I mounted the new one in rubber and it worked fine for years until I got tired of interference from other ones in my neighbourhood. Now I use one that is digital at 900MHz. ;D Quote Link to comment Share on other sites More sharing options...
walid Posted October 17, 2005 Author Report Share Posted October 17, 2005 This site is good but not excllent, I see it befor, it provide a surface info.I want info enable me to identifiy the TX and Rx sections and isolating them and using them say as a walki-talki, or eabling me to make a hand set of different device see another main one, like this.......I hear about some people i mt city doing this, what the amazing thing is that those people are out of electronics field at all, what they do? I don't know. How they learn this!!!!thanks. Quote Link to comment Share on other sites More sharing options...
walid Posted October 18, 2005 Author Report Share Posted October 18, 2005 Yes I'am always search using google before I ask but may be I have bad luck or may i search in wrong way.I wat now to use your link and see if it help meI thank you very muchWALID Quote Link to comment Share on other sites More sharing options...
walid Posted October 21, 2005 Author Report Share Posted October 21, 2005 I know this link befre and i store in my desk all what he writesit is for Danial it does not talk about cordless phone the way i wantbut thank you tnk2k Quote Link to comment Share on other sites More sharing options...
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