Post by thread:[EE] Wireless Amplifier

Hello, I am building a 1.3w Wireless Amplifier these days. http://www.qsl.net/n9zia/wireless/2.4amp-rfsense.html I finished the pcb yesterday and purchased all the components. Well it seemed to me that everything is going fine.I am a good solderer also.This is going to be the first one I am building so I may not see what I suppose to see somewhere. What can you suggest me about building a wireless amp ? What kind of stuff I must be careful about ? Thank You

Keep an eye out for the FCC .... On 2006-Jul 26, at 01:24hrs AM, Yigit Turgut wrote: Hello, I am building a 1.3w Wireless Amplifier these days. http://www.qsl.net/n9zia/wireless/2.4amp-rfsense.html I finished the pcb yesterday and purchased all the components. Well it seemed to me that everything is going fine.I am a good solderer also.This is going to be the first one I am building so I may not see what I suppose to see somewhere. What can you suggest me about building a wireless amp ? What kind of stuff I must be careful about ? Thank You -

On 7/26/06, Yigit Turgut <spam_OUTy.turgutTakeThisOuTgmail.com> wrote: > Hello, > > I am building a 1.3w Wireless Amplifier these days. > > http://www.qsl.net/n9zia/wireless/2.4amp-rfsense.html > > I finished the pcb yesterday and purchased all the components. > > Well it seemed to me that everything is going fine.I am a good > solderer also.This is going to be the first one I am building so I may > not see what I suppose to see somewhere. > > What can you suggest me about building a wireless amp ? What kind of > stuff I must be careful about ? Careful about soldering, adapting and measuring. I've guess you have at least a spectrum analyzer and a signal generator on this band, right ? greetings, Vasile

Yigit Turgut wrote: > What do you mean by signal generator "on this band" ? > > I have a signal generator which i will use to generate diffrent shaped > signals,send to wamp and check the transmission with an osiloscope > connected to reciever side to check gain,noise an other stuff. > > Am I missing something ? > Don't normally say much but this one needed saying. You are looking to build a device that transmits on 2.4GHZ, just about the same frequency as your microwave oven and you know what that does. Your comments and questions to date indicate that you are not experienced in this area. At 2.4gigs a 50ohm stripline that is an electrical short circuit is no longer a short circuit at the frequency but an inductor whose value is determined by length (intentionally not mentioned other factors) The board layout and material MUST be spot on, no 'thats near enough' Without a spectrum analyzer you should NOT even consider building a transmission device which could be capable of 'cooking' your big toe and could radiate all over the spectrum and well out of band causing interference to other Wi-Fi users and probably the amateur bands, commercial bands and military bands. Depending on where you live, sentences vary from huge fines and confiscation of equipment to custodial. I am not saying that homebrew kit should not be built, after all my 23cms, 13cms and 3cms kit is all homebrew but tested and setup using the correct equipment. Cheers Dave (G0GMK)

On 7/26/06, Yigit Turgut <.....y.turgutKILLspam@spam@gmail.com> wrote: > What do you mean by signal generator "on this band" ? on 2.4Ghz band with the bandwith requested by the application, if you need 5Mhz bandwidth then your generator must be able to generate between 2.400Mhz-2.5Mhz to 2400Ghz+2.5Mhz > I have a signal generator which i will use to generate diffrent shaped > signals,send to wamp and check the transmission with an osiloscope > connected to reciever side to check gain,noise an other stuff. > > Am I missing something ? So you have a 3Ghz bandwith oscilloscope ? Or you've showed us a 2.4Ghz bidirectional amplifier in the link and you'll do a different thing ? > -

> Don't normally say much but this one needed saying. > You are looking to build a device that transmits on 2.4GHZ, just about > the same frequency as your microwave oven and you know what that does. Everything is constant there is no variable component.I'll just put the pieces together.Althought there is no guarantee that spectrum will match with expected %100.I had already planned to test the amp at one of my clients lab before use.But thank you for reminding me the possibilities.(Not that I do care about wireless users or other stuff,its just that I love my big toe) I do not have a 3Ghz oscilloscope - its not the best giving investment in my field,I'll use a friend of mines.

On 7/26/06, Yigit Turgut <y.turgutKILLspamgmail.com> wrote: > > Don't normally say much but this one needed saying. > > You are looking to build a device that transmits on 2.4GHZ, just about > > the same frequency as your microwave oven and you know what that does. > > Everything is constant there is no variable component. Just to remind you: even a microscopic dirt on the microstrip line it's a variable, a wrong soldered part it's a variable, a noise on the suply it's a variable, other epsilon that one computed for dimensioning the microstrip or strip line it's a variable. Good luck. Vasile