Thanks For taking the time to read. I'm trying to make a rff filter there are different types that could work in my situation. The first would be a high pass that blocks everything under 120Mhz, the application is cable Tv signal, so the impedance would be 75 ohm. I'm looking for attenuation in the -50db range, there are two very specific carriers i'm trying to block 75.25 in one location and 104.2 in another, which is a qpsk carrier each channel is 1.5 Mhz wide, besides those two frequencies, there's nothing on the system until about 200mhz, so a high pass filter would work in both situations or two separate notch filters could work also as the 75.25 to be blocked is at one site, and the 104.2 is at another. I'm thinking building two high pass filters that will work for both sites, would be easier rather having to build two different type of notch circuits. I tried a few different type of lc circuits, but nothing really worked as i wanted to, I'm am not new to circuitry soldering, and different type of diy electronic projects, but i am new to the rf realm of things.
As a side note, i was thinking my lc circuits may have not been working because of bad shielding issues from the source side of the cable not being isolated from the other side of the lc circuit, but not sure.
ps. I would like to build this as cheap as possible.
thanks for your help
As a side note, i was thinking my lc circuits may have not been working because of bad shielding issues from the source side of the cable not being isolated from the other side of the lc circuit, but not sure.
ps. I would like to build this as cheap as possible.
thanks for your help