Hi All,
I'm close to my EE. BSc finale and I'm looking to play around a little bit with the stuff I've learned. To be honest, I'm a little bit upset that afer 4 years of learning communications theory, I'm not able to choose the HW I need.
My idea is to reach a half duplex walkie talkie with the following reqs:
-Low voltage operation. Till 5V.
-Range about 1.5 km LOS
-ISM frequency use ( I preffer 433 MHZ UHF bands )
-Single chip that doesn't require extra elements as crystal or filters
The idea is to intstall 2 walkie talkies, one on each house. House are about 900m range. One has a direct window outside while the other is an interior office.
The application is for voice only. Cosidering the FM advantages I'll prefer it, but if there is a big difference of value then AM could be an option.
The chip I'm looking for must be smallest that can be.
I've seen many chips ( as the following links ) but I'm not sure that their digitals buffers support voice applications..
http://www.hoperf.com/rf_fsk/fsk/21.htm
http://www.melexis.com/Wireless-Multi-Market--Sensing/RFIC-Transceivers-27-to-950MHz/TH7122-121.aspx
http://www.silabs.com/products/audio/fmtransceivers/Pages/default.aspx
Thanks !
I'm close to my EE. BSc finale and I'm looking to play around a little bit with the stuff I've learned. To be honest, I'm a little bit upset that afer 4 years of learning communications theory, I'm not able to choose the HW I need.
My idea is to reach a half duplex walkie talkie with the following reqs:
-Low voltage operation. Till 5V.
-Range about 1.5 km LOS
-ISM frequency use ( I preffer 433 MHZ UHF bands )
-Single chip that doesn't require extra elements as crystal or filters
The idea is to intstall 2 walkie talkies, one on each house. House are about 900m range. One has a direct window outside while the other is an interior office.
The application is for voice only. Cosidering the FM advantages I'll prefer it, but if there is a big difference of value then AM could be an option.
The chip I'm looking for must be smallest that can be.
I've seen many chips ( as the following links ) but I'm not sure that their digitals buffers support voice applications..
http://www.hoperf.com/rf_fsk/fsk/21.htm
http://www.melexis.com/Wireless-Multi-Market--Sensing/RFIC-Transceivers-27-to-950MHz/TH7122-121.aspx
http://www.silabs.com/products/audio/fmtransceivers/Pages/default.aspx
Thanks !
