Output impedance calculation of a cellular tracking ciruict

[haadi20]

output impedance calculation

I wish to calculate the impedance at the output side of the attached circuit. As an antenna is to be connected with the same impedance at the output therefore an exact value would be needed.


The aim of this circuit is to detect the mobile communication during take off and landing of the Aeroplane, which is normally prohibited, as we know. The expected range of the detector is about 5 feet.

How can the above be done? Should we starting from left side of IC3-3130 and how to calculate it..

Is their any software which can do the job or by hand calculations. Guidance for both will be appreciated. Thanks a lot.

 

[FvM]

impedance calculation ads

If a 741 can work as a RF detector (it most likely does, because the RF voltage is rectified by the input stage), the effect is nearly completely canceled by R1 operating as an input filter. Any diode detector can be expected more effective. Also IC1 isn't biased correctly.

 

[haadi20]

Thanks for your reply FvM. Can you please suggest the solutions to fix the two issues you pointed out?

Also is there a tool which could do the impedance calculation for such a circuit ?