I am using a electronic circuit that the input to it is an NTSC CAMERA. The input video is
Clean without any noise. I have noticed that the output video signal from the circuit I am
Using has a noise at frequency of 248 Mhz. In order to attenuate it I used an ADA4411-
3 video filter and connected the output to a Spectrum analyzer. The 248Mhz still existed in
the video signal is was slightly attenuated but it is not enough . The input to the ADA4411-
3 is NTSC 1VPTP.
My questions are:
Why filter doesn't work properly? the 248 SIGNAL WAS ATTENUATED ONLY BY 4dBm.
If the inut signal is 1VPTP what value of RL should be in order to get 1Vptp at the output of
the ADA4411-3 will using G =2 LEVEL ONE designed to be 500Mv and LEVEL 2 IS
connected to gnd