Hi,

I am struggling to get a good reading using a RF sniffer/Frequency counter for a FM transmitter - could it be that it's also picking up other RF emissions?

If that is the case, what DIY method can I use to build an RF isolation chamber so I can get accurate readings for the frequency counter?

 

You can always try a Faraday cage - http://en.wikipedia.org/wiki/Faraday_cage

 

I've thought of that, but I was thinking that there must be an easier way to shield RF, like aluminium foil or something?

 

Maybe a direct coupled connection would be better. try a 10 pf and 1 meg resistor and lower the resistor value if the counter doesn't get enough signal.

 

Hello,

The best is to mount the RF amplifier inside a metal box.
I made a photo of an example of an RF amplifier I have here.

Bertus

 

Maybe a direct coupled connection would be better. try a 10 pf and 1 meg resistor and lower the resistor value if the counter doesn't get enough signal.

Thanks, but this is not measured through an RF sniffer that connects to the antenna position on the circuit, it's a separate device with a telescopic aerial that measures RF output and determines frequency

 

Hello,

The best is to mount the RF amplifier inside a metal box.

Dankie Bertus. I will definitely try that.