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

4.6 4.6 out of 5 stars 274 ratings
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Purchase options and add-ons

  • Blocks the broadcast FM band between 88 – 108 MHz with over 50dB of attenuation.
  • Insertion loss is less than 0.5 dB between 0 – 1 GHz, and mostly less than 1.5 dB between 1 – 3 GHz.
  • Uses SMA female connectors. Comes with a free SMA male to SMA male adapter.
  • Designed for SDR and radio scanner users. TV installers this is probably not the right product for you. TV installers please read the description carefully to avoid disappointment.

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

Includes 1x RTL-SDR Blog Broadcast FM Band-Stop Filter and 1x SMA male to SMA male adapter.

Blocks the broadcast FM band between 88 – 108 MHz with over 50dB of attenuation. Designed for RX use only.

Insertion loss is less than 0.5 dB between 0 – 1 GHz, and mostly less than 1.5 dB between 1 – 3 GHz. Uses SMA female connectors. Comes with a free SMA male to SMA male adapter.

A broadcast FM block filter can help if you have very strong broadcasts in your area that are overloading the SDR dongle. Also known as an “FM Trap”.

TV installers please read and pay very close attention to the following: This is probably not the right product for you. These filters are designed for software defined radio and radio scanner users. The filter uses SMA connectors. SMA connectors are very common in the professional RF world, but are NOT commonly used in home TV installations. TV installs normally use F-TYPE or PAL connectors. So this filter will not fit onto F-TYPE or PAL connectors which are common in the TV world without the use of an adapter, which is not supplied.

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

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

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Customer reviews

4.6 out of 5 stars
4.6 out of 5
274 global ratings

Customers say

Customers like the quality, sturdiness, and value of the FM Blocking Filter. For example, they mention it works well, is solid, and has a reasonable price. That said, some complain about the size and attenuation.

AI-generated from the text of customer reviews

37 customers mention32 positive5 negative

Customers like the quality of the FM Trap. They mention that it works well, and 100% attenuates the FM broadcast band. Some say that it's simple and works well with other SDR boards. Overall, most are satisfied with the quality and functionality of the product.

"Seems to work well. I checked the attenuation using a NanoSA (see pictures) and it looks like it works." Read more

"A must have if you use a SDR radio for monitoring FM. It works very well and 100% attenuates the FM broadcast band...." Read more

"Simple, works." Read more

"...The FM Broadcast band is very close and those stations are very powerful, which can desensitize your receiver...." Read more

15 customers mention15 positive0 negative

Customers are satisfied with the sturdiness of the product. They say that it is a solid choice for out-of-band FM transmitter measurements, and is well constructed. It completely blocks strong FM signals in their area that were swamping out their SDR. It improves air band reception, and greatly reduces nearby FM broadcast interference. It is perfect for NOAA reception, the noise floor, and has helped P25 reception.

"...these units significantly improved the noise floor, and has helped P25 reception." Read more

"...I can attest that it does indeed cut FM reception significantly between 88-108 MHz...." Read more

"...I will probably order another for use in my car. Reception across the board was improved in all frequencies for the scanner." Read more

"...Return loss was 20 dB or better out to nearly 900 MHz. This is a solid, well-constructed filter that should be quite useful for my purposes." Read more

4 customers mention4 positive0 negative

Customers appreciate the value of the audio or video player. They say it's a great product at a reasonable price.

"I was skeptical, but the reviews were good and the price was reasonable, so I ordered one. Am I glad I did...." Read more

"...good constructed & performing Blocking Filter .. l Good job for affordable price." Read more

"...It's excellent, can be used with any radio, and it's inexpensive. It works. Nothing more I can say. Buy it if you have the FM BCB problem." Read more

"Great for inexpensive SDRs..." Read more

3 customers mention3 positive0 negative

Customers are satisfied with the appearance of the audio or video adapter. They mention it has a wonderful blend of cheap and nice.

"Nice unit -- works well to keep down strong FM stations. This can help when listening to the VHF air band. Seems to work pretty effectively...." Read more

"Wonderful blend of cheap/Q" Read more

"Very nice, DEEP, notch as advertised! Suggest you sell one with F connectors (or with adapters)...." Read more

8 customers mention4 positive4 negative

Customers are mixed about the attenuation of the product. Some mention that it has very good attenustion, solid signal attenution, and helps reduce EMI on their RTL-SDR. However, others say that it does not attenute local strong signals and that the signal is not detected.

"...It works very well and 100% attenuates the FM broadcast band. I was amazed how well it cleaned up my reception." Read more

"...normal gain I use for NOAA weather satellites there is no measurable signal in the FM range. I am close to a tower and its signal is not detected...." Read more

"Used on an APRS Recieve only I-Gate. Definitely helped reduce EMI on my RTL-SDR...." Read more

"...strongest signals in the spectrum view of the SDR, but they are greatly attenuated." Read more

4 customers mention0 positive4 negative

Customers are dissatisfied with the size of the audio or video adapter. They mention it's tiny and impossible to find a miniature version.

"Man, this thing is tiny. But it does the job and that's all that matters...." Read more

"Not for FM blocking of OTA signals on COAX. Does not fit COAX wire." Read more

"...Instead they are some highly unusual and impossible to find miniature version. Looked everywhere and no one carries an addaptor" Read more

"Sent back, wrong size for coax." Read more

Does the job
5 Stars
Does the job
Seems to work well. I checked the attenuation using a NanoSA (see pictures) and it looks like it works.
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Top reviews from the United States

Dan Ponte
5.0 out of 5 stars Well-built, works as advertised
Reviewed in the United States on February 6, 2024
Verified Purchase
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.
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richard ingram
5.0 out of 5 stars Does the job
Reviewed in the United States on April 24, 2024
Verified Purchase
Seems to work well. I checked the attenuation using a NanoSA (see pictures) and it looks like it works.
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richard ingram
5.0 out of 5 stars Does the job
Reviewed in the United States on April 24, 2024
Seems to work well. I checked the attenuation using a NanoSA (see pictures) and it looks like it works.
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Mike
5.0 out of 5 stars Works very well
Reviewed in the United States on January 27, 2024
Verified Purchase
A must have if you use a SDR radio for monitoring FM. It works very well and 100% attenuates the FM broadcast band. I was amazed how well it cleaned up my reception.
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Mike
5.0 out of 5 stars Works very well
Reviewed in the United States on January 27, 2024
A must have if you use a SDR radio for monitoring FM. It works very well and 100% attenuates the FM broadcast band. I was amazed how well it cleaned up my reception.
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Tom Servo
4.0 out of 5 stars It certainly made a difference for me!
Reviewed in the United States on August 7, 2017
Verified Purchase
Man, this thing is tiny. But it does the job and that's all that matters. I'm using it with an SDRplay RSP-1 instead of an RTL-SDR dongle, but the connectors are the same so it's a direct-fit to the radio's antenna connection. Including the little "jumper" to mate both male SMA connectors is a welcome addition. I can attest that it does indeed cut FM reception significantly between 88-108 MHz. I'm only about 12 air miles from multiple 100 kW broadcasters, and just 1,500 feet from a 250 watt FM translator on an AM stick near my neighborhood. This filter reduces the 100 kW stations down to next to nothing even with the SDRplay's low noise amp engaged. The translator still blasts through, which is to be expected, but most importantly it's no longer mixing with other big signals and polluting the 200-430 MHz band range anymore like they did before. Excellent! Now I can listen to UHF air band and everything around it without being overwhelmed by wideband FM broadcast signals.
5 people found this helpful
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Ronald Karper
5.0 out of 5 stars Good Bandstop
Reviewed in the United States on March 6, 2024
Verified Purchase
Simple, works.
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Ronald Karper
5.0 out of 5 stars Good Bandstop
Reviewed in the United States on March 6, 2024
Simple, works.
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DANIEL
5.0 out of 5 stars Every scanner enthusiast should have one of these.
Reviewed in the United States on October 6, 2019
Verified Purchase
I was skeptical, but the reviews were good and the price was reasonable, so I ordered one. Am I glad I did. This tiny filter easily installed right at the Uniden Home Patrol SMA input connector and because they give you an adaptor, it easily will go right in line with your existing SMA cable. I primarily listen to the Air Band (aircraft and airports). The FM Broadcast band is very close and those stations are very powerful, which can desensitize your receiver. I am located near several FM broadcast towers (within 2 miles), and my airband reception on the scanner was always substandard. Add to that my location is in a "shadow" of a small mountain between me and SD Airport.

So, I put it in line and immediately I picked up the San Diego Airport ATIS frequency which I could not hear at all before. They old rule is if you can't hear the ATIS, you can't hear the tower since they broadcast from the same spot. Needless to say, the tower now came in too along with ground control. This was an amazing improvement without having to add any amplifier to my antenna. All airborne aircraft now came in loud and clear, when before there was some hiss static. Great product, small size, very reasonable price. I will probably order another for use in my car. Reception across the board was improved in all frequencies for the scanner.
10 people found this helpful
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C. Thompson
5.0 out of 5 stars Works as described
Reviewed in the United States on March 10, 2024
Verified Purchase
I swept it on my VNA…it works well for dealing with urban FM band overload issues.
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KCCardsFan
5.0 out of 5 stars Solid choice for out-of-band FM transmitter measurements
Reviewed in the United States on February 28, 2020
Verified Purchase
I chose this specifically for making out-of-band harmonic and spurious measurements for a low power FM transmitter project. I'm using an RTL-SDR as a spectrum analyzer to make the measurements, and my goal is to measure out to the 10th harmonic of the 88-108 MHz band. I chose this over another commonly available FM band-stop filter because this unit is made solely from linear elements; the other choice, while perhaps offering a bit more in-band rejection, also has an ESD protection diode which may tend to generate harmonics. I measured this filter on a NanoVNA, calibrating with a 10 dB attenuator on Port 2 to improve its input return loss, then used the included SMA male-male adapter on Port 1. Attenuation was 52+ dB from 88-108 MHz, 5.8 dB at 78, 9.0 dB at 118, less than 0.2 dB at 148, and less than 0.3 pretty much all the rest of the way up to 1 GHz. Return loss was 20 dB or better out to nearly 900 MHz. This is a solid, well-constructed filter that should be quite useful for my purposes.
2 people found this helpful
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Top reviews from other countries

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Dan
4.0 out of 5 stars Good product
Reviewed in Canada on July 26, 2021
Verified Purchase
Works well was able to pick USB and LSB and AIR
before without it I could not without FM all over the frequencies great product
One person found this helpful
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Sax
5.0 out of 5 stars SEMPRE IL MIGLIORE
Reviewed in Italy on December 31, 2022
Verified Purchase
SEMPRE IL MIGLIORE
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Halibuta52
5.0 out of 5 stars A very good receiver only filter that works! Not designed for transmit circuits.
Reviewed in the United Kingdom on May 3, 2021
Verified Purchase
Pay a bit more money and buy a filter that works! I fitted this between a 50mhz beam antenna and a receiver to remove the FM broadcast band interference. As you can see from the 2 photos, it works a treat! Oh, the actual signal levels indicated are not as per real life as RF attenuators are fitted in circuit?
Customer image
Halibuta52
5.0 out of 5 stars A very good receiver only filter that works! Not designed for transmit circuits.
Reviewed in the United Kingdom on May 3, 2021
Pay a bit more money and buy a filter that works! I fitted this between a 50mhz beam antenna and a receiver to remove the FM broadcast band interference. As you can see from the 2 photos, it works a treat! Oh, the actual signal levels indicated are not as per real life as RF attenuators are fitted in circuit?
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Nick Abelas
5.0 out of 5 stars Perfect
Reviewed in Australia on December 10, 2023
Verified Purchase
Performance is fantastic for my needs. Very happy with it
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