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

4.5 4.5 out of 5 stars 283 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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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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Customer reviews

4.5 out of 5 stars
283 global ratings

Customers say

Customers like the quality, construction, and noise of the FM broadcast filter. For example, they mention it works well, it's excellent, and it completely blocks strong FM signals. That said, some complain about the size. Opinions are mixed on attenuation.

AI-generated from the text of customer reviews

Select to learn more
QualityConstructionNoiseValueAttenuationSize
39 customers mention "Quality"34 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.

"...In fact, it works better with the stock antenna too. It's apparently reducing the overall SWR enough to allow the Boafeng to function...." Read more

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

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

16 customers mention "Construction"16 positive0 negative

Customers are satisfied with the construction of the filter. For example, they mention it's well constructed, and performs well. Some say it completely blocks strong FM signals that were swamping out their SDR. That said, they say it improves air band reception, and reduces nearby FM broadcast interference. That being said, some say it'll be able to fix the SDR reception problem.

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

"...these units significantly improved the noise floor, and has helped P25 reception." 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 mention "Noise"4 positive0 negative

Customers are satisfied with the noise reduction capabilities of the product. They mention that it reduces the noise floor by at least 50%, and the noise levels are flat lined.

"...Lowered the noise floor by at least 50% on my cheap Quansheng handheld." Read more

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

"...of FM band after installing this but all the other frequencies came in loud and clear. Much higher quality than expected. Two thumbs up from me." Read more

"Added this to my SDR and it cleaned up the noise I was getting around the 137Mhz when I download the NOAA and Meteor M2 satellite images...." Read more

4 customers mention "Value"4 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

8 customers mention "Attenuation"4 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 mention "Size"0 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

It works!!!
5 out of 5 stars
It works!!!
I have a Boafeng UV-5R series radio I was beginning to regret buying. Not that it's expensive but being new to this, I jumped in and bought a bunch of Baofeng accessories that I don't want to return. Come to find out the Boafeng's get easily overloaded on the front end and with any upgraded antenna it's been useless - cuts out or receives nothing. Based on reading and a guess, I ordered this and with a Nagoya 771 antenna it's working right out of the box! In fact, it works better with the stock antenna too. It's apparently reducing the overall SWR enough to allow the Boafeng to function. If you're having similar issues with any of the more inexpensive HAM or GMRS HT's, I recommend this filter.
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Top reviews from the United States

Darbco
5.0 out of 5 stars Solid construction and performance
Reviewed in the United States on June 9, 2024
Verified Purchase
A must have item if you have strong broadcast fm stations in your area. Lowered the noise floor by at least 50% on my cheap Quansheng handheld.
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Darbco
5.0 out of 5 stars Solid construction and performance
Reviewed in the United States on June 9, 2024
A must have item if you have strong broadcast fm stations in your area. Lowered the noise floor by at least 50% on my cheap Quansheng handheld.
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Ted J. Wheeler
5.0 out of 5 stars It works!!!
Reviewed in the United States on July 19, 2024
Verified Purchase
I have a Boafeng UV-5R series radio I was beginning to regret buying. Not that it's expensive but being new to this, I jumped in and bought a bunch of Baofeng accessories that I don't want to return. Come to find out the Boafeng's get easily overloaded on the front end and with any upgraded antenna it's been useless - cuts out or receives nothing. Based on reading and a guess, I ordered this and with a Nagoya 771 antenna it's working right out of the box! In fact, it works better with the stock antenna too. It's apparently reducing the overall SWR enough to allow the Boafeng to function. If you're having similar issues with any of the more inexpensive HAM or GMRS HT's, I recommend this filter.
Customer image
Ted J. Wheeler
5.0 out of 5 stars It works!!!
Reviewed in the United States on July 19, 2024
I have a Boafeng UV-5R series radio I was beginning to regret buying. Not that it's expensive but being new to this, I jumped in and bought a bunch of Baofeng accessories that I don't want to return. Come to find out the Boafeng's get easily overloaded on the front end and with any upgraded antenna it's been useless - cuts out or receives nothing. Based on reading and a guess, I ordered this and with a Nagoya 771 antenna it's working right out of the box! In fact, it works better with the stock antenna too. It's apparently reducing the overall SWR enough to allow the Boafeng to function. If you're having similar issues with any of the more inexpensive HAM or GMRS HT's, I recommend this filter.
Images in this review
Customer image
Customer image
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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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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.
Customer image
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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Customer imageCustomer image
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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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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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EDN
3.0 out of 5 stars Three Stars
Reviewed in the United States on February 22, 2018
Verified Purchase
It was missing a screw and the result is curious
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EDN
3.0 out of 5 stars Three Stars
Reviewed in the United States on February 22, 2018
It was missing a screw and the result is curious
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One person found this helpful
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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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Saverio
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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