Re: RF Switcher and Current Monitor Sample
- From: Joerg <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 28 Jun 2005 17:01:48 GMT
Hello Johnson,
I am currently working on a GPS Receiver that is able to support both internal and external antenna. I would like the system to detect the external antenna and switch to the external antenna automatically. I remembered I once read a sampe from a magazine that required a RF switcher and a Current Shunt Monitor (like INA138) to detect the current, but I forgoty where it was. ...
The classical approach would be to use PIN diodes to switch between the antennas. At regular intervals your circuitry (behind the receiver output) could switch to the external antenna and make a decision based on signal strength. The decision could, for example, be contingent on seeing a signal at all or you could decide based upon which antenna delivers the best signal.
Regards, Joerg
http://www.analogconsultants.com .
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