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I used the red in another thread where somebody used an electrolytic capacitor that did not pass radio frequencies.As for the red circle, I think AG just got out of bed that morning and thought - "I will do something with a red circle today!"
Yes, if the antenna does not touch anything conductive.wait....so will this thing work if i leave the capacitor out altogether?
Yes, if the antenna does not touch anything conductive.
But it will pickup low frequencies without the capacitor like mains hum.
A 22pF capacitor feeding the 10k resistor reduces pickup of frequencies below 727kHz so it will pickup strong AM radio stations.
If the capacitor is only 10pF and the resistor is 1k ohms then frequencies below 16MHz will be reduced.
How are you testing the circuit? ie. how is it hooked up, what are you using to test it such as a known good signal source?
AG would be best to tell you what power level it will detect, but I suspect at least +13dBm near the meter.
My FM transmitter is much more powerful than a cheap car FM transmitter. I don't think the simple Field Strength Meter will detect such a weak transmitter.
FM stereo transmitters made to broadcast an MP3 player in the car to the car radio have an attenuator at the radio output. So the radio transmission is very weak.
Tell us if the Field Strength Meter has an output when the antenna of the weak transmitter is connected to the antenna of the FSM.