EMRFD Message Archive 13669

Message Date From Subject
13669 2017-03-09 19:36:31 Ashhar Farhan Full duplex transceiver
This is what they did at Cornell :

The transmitter signal is split six ways and each is delayed by 90 degrees and fed into a transmission line that has taps every quarter wave length. So as the signal progresses down the line towards the antenna, it keepa adding up. For the signal in the reverse direction , the transmit signal is used to subtract itself as it will be 180 degrees out. 
They claim -140 dbc suppression of the signal in reverse direction.
Can anyone with a IEEE sigin tell us more?

- f
13674 2017-03-10 08:31:00 Riccardo Montagut... Re: Full duplex transceiver
Hi Farhan,

I’ve just downloaded the paper for you I hope it helps, if you need other papers don’t hesitate to ask!

73 Riccardo IU4IRC

Il giorno 10 mar 2017, alle ore 03:44, Ashhar Farhan farhanbox@gmail.comfarhanbox@gmail.com> [emrfd] <emrfd@yahoogroups.comemrfd@yahoogroups.com>> ha scritto:


This is what they did at Cornell :
http://ieeexplore.ieee.org/document/7835655/?reload=true

The transmitter signal is split six ways and each is delayed by 90 degrees and fed into a transmission line that has taps every quarter wave length. So as the signal progresses down the line towards the antenna, it keepa adding up. For the signal in the reverse direction , the transmit signal is used to subtract itself as it will be 180 degrees out.
They claim -140 dbc suppression of the signal in reverse direction.
Can anyone with a IEEE sigin tell us more?

- f





[Non-text portions of this message have been removed]
13678 2017-03-10 09:47:43 Ashhar Farhan Re: Full duplex transceiver
thanks, riccardo. it is a very intersting paper
- f

13688 2017-03-10 11:56:39 Riccardo Montagut... Re: Full duplex transceiver
I am glad to be able to help you, building your projects (expecially the sweeperino and the bitx) from scratch  made me decide to do the Ham exam!

73 Riccardo

Inviato da iPhone

Il giorno 10/mar/2017, alle ore 18:47, Ashhar Farhan farhanbox@gmail.com [emrfd] <emrfd@yahoogroups.com> ha scritto:

 

thanks, riccardo. it is a very intersting paper
- f