Signal analysis

[Epontes]

Hi all..
Imagine.. you have to know if a helicopter vhf transmitter is working and you have just an oscilloscope..
the transmitter range is between 108 MHz and 136 MHz. Than you set the frequency on the transmitter and have to use an this osciloscope to know if transmitter is transmitting the same frequency you have set and its parameters..
How to use this oscilloscope to pick the signal up and analyze?
thanks

 

[FvM]

If the oscilloscope has sufficent bandwidth, you should be at least able to see a transmitter antenna output by simply attaching a wire oscilloscope input and bringing it near to the antenna. You can estimate transmitter operation frequency.

To measure the frequency exactly and view the modulation, you better use a cheap DVBT USB stick and free SDR software. You seem to send at FM broadcast and aviation radio frequencies, no good idea. Don't be surprized if you see a detector van near your house.

 

[Epontes]

Thanks for attention.. I’m gonna do it, do you have any indication about this sdr software and dvtb stick?

 

[FvM]

I've been using NooElec RTL-SDR, but there are many others. URH (Universal Radio Hacker) is a popular SDR sofware.