Broadcast FM Block Filter (88-108 MHz Block) by RTL-SDR Blog

kills the dang Hip Hop station about a mile from me on my SDR. Worth the price and works well. No more overload and ruining reception on other bands.

I live 2 miles away from (and in actual line of sight of) a 50 kW FM station, and no fewer than 2 other smaller transmitters. The 50kW station was coming in at -8 dBFS. Trying to receive P25 public safety radio with my two RTL-SDRs mostly worked, but it was clear that the front end of the SDRs was being overloaded by the FM station(s). Installing these units significantly improved the noise floor, and has helped P25 reception.

Works as advertised. Owned this for almost a year now. Blocks out the broadcast stations, and I live close to a few of them.

I have compared the RTL-SDR FM bandstop to the NESDR FM bandstop with 3 different SDRs, which are the NESDR Smartee v2, NESDR Smartee XTR, and recently the Airspy R2. I have several strong FM signals in my area and the NESDR FM bandstop could not filtered this FM signals out. The RTL-SDR FM bandstop could filter out the strong FM signals except for one signal the showed a response using SDRSharp, but you have to try both SMA connections rotated 180 degrees to find out which side is better. One side of the SMA connector for me was the same as the NESDR FM bandstop filtering capabilities with the strong FM signals. The other side flipped reduced the strong FM signals. I have read there was no difference in which end to connect to the SDR, but it does matter in my case with the RTL-SDR FM bandstop. The NESDR FM bandstop was the same with each SMA connection into my SDRs allowing in the strong FM signals above 100 MHz. Both FM bandstops worked the same below 100 MHz and are good bandstops, but someone should try both first and buy the one that works best for their area.

I was having a lot of interference from two of the local FM radio stations. After adding this...problem solved.

I have begun to play around with SDR, looking at various bands to see what I can get. One problem is FM broadcast. I am about a mile away from a 5kW FM station. Depending on what I am trying to pick up, that station can cause issues. No fault of the station, it is just the way radio works. This filter helps cut down the interference to a level where it ceases to be of consequence.

Used this with my RTL-SDR V4 and my Baofeng UV-5RM. made absolutely no difference. This has a good amount of positive reviews, might work for you but didn’t work for me.

Works great