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Author Topic: Radio Frequency Sniffer Circuit  (Read 4083 times)

Offline mikeinkaty

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Radio Frequency Sniffer Circuit
« on: December 21, 2013, 11:54:49 PM »

I got to this forum from the above web page.

1) what are the units on the capacitors?  nf, uf, pf, farads????
2) what L/C values would make this circuit most responsive to 850Mhz carriers?

I have MMS game cameras that I use miles away from the nearest cell towers.  (deer don't tend to hang around cell towers)   Because of this I have to use external 850Mhz Yagi antennas generally with a gain of 11-13 dbi.

I want a cheap and fast way to find the direction to the tower providing best signal strength.  My thoughts are to have an 850Mhz carrier signal amplifier with an analog meter (not digital).  This way I could screw the sma connector onto the device and find the best signal by slowly rotating the antenna.

Do you think the above circuit could do what I want if I removed the piezo buzzer and replaced it with, say, a 1ma meter??  You can email me if you wish.

Mike Taylor
Katy TX   

Offline eltech

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Re: Radio Frequency Sniffer Circuit
« Reply #1 on: December 26, 2013, 09:57:01 PM »
All values of capacitors are in uF.
I don't know if this circuit is very good for your needs, but you can modify value of L1 coil (increase inductance), to increase the resonance frequency.
Anyway you can try also this circuits, but it is needed  to modify resonance frequency:

Offline Soulstealer

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Re: Radio Frequency Sniffer Circuit
« Reply #2 on: May 27, 2015, 10:24:36 AM »
     Read listen and think on it