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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

Q: Has anyone tried this (with sma-to-f adapters) for tv use? this would result in 50-ohm to 75-ohm mismatch. hard to find traps for tv use.

A 50 to 75 Ohm impedance mismatch is completely negligible on RX, so impedance mismatch won't be an issue.

Q: Does this have RG6 cable connections?

RG6 is a type of cable, not a connector. But I think you're meaning to ask if it uses F-Type or PAL type TV connectors? No this uses SMA connectors. Please see the product description for more info about the connectors it uses.

Q: What is the max RF input of this device?

I would recommend no more than 1W (30dBm), but we have reports of users using them long term with power levels of up to 20W (40dBm) without any issues.

Q: I am trying to target 108 mhz specifically. is there a schematic if i need to alter something? (of course, voids any returns) maybe from 107 to 109 m

Sorry, it wouldn't be practical to try to modify this filter to reject a very small band. Having opened mine, IIRC the filter has only a few sections, 3 or 4, in a pi configuration. That means it only has a handful of pole pairs in its transfer function. As the bandwidth narrows, the number of poles required to achieve the required response increases, pretty much as the inverse of the bandwidth. So for a bandwidth 1/10 as wide as the 20 MHz it's designed for, you might need a filter of roughly 10x complexity, as a starting point. That's not really practical, so the system engineer would probably recommend completely different architectures, such as a lowpass or highpass, which still would be quite difficult and require much higher Q (larger) resonators, such as cavities or exotic materials. The other approach would be a tunable bandpass at the frequency of interest. That's not exactly simple, but it's probably far easier. There may be other system options depending on the separation from 108 MHz, the degree of rejection required, the type of modulation involved, etc.

Product ID: 38506021

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Details

Compatible Devices
Laptop Desktop
Connector Type
SMA
Brand
RTL-SDR Blog
Connectivity Technology
Radio
Color
Black

⚡<0.5 dB insertion loss (0-1 GHz)

📶50dB FM band attenuation

🔌SMA female connectors + adapter

Description

📡 Cut the noise, keep the signal — your SDR’s new best friend!

COMPACT LIGHTWEIGHT - Sleek 0.63 oz design fits effortlessly into any professional RF setup
ULTRA LOW SIGNAL LOSS - Insertion loss under 0.5 dB up to 1 GHz ensures crystal-clear reception
PRO GRADE CONNECTIVITY - Equipped with SMA female connectors plus a free SMA male-to-male adapter for seamless integration
PRECISION FM BAND BLOCKING - Over 50dB attenuation between 88-108 MHz to eliminate broadcast overload
TAILORED FOR SDR ENTHUSIASTS - Specifically designed to optimize software-defined radio and scanner performance

The RTL-SDR Blog Broadcast FM Block Filter expertly blocks the 88-108 MHz FM broadcast band with over 50dB attenuation, minimizing interference for software-defined radios and scanners. Featuring ultra-low insertion loss (<0.5 dB up to 1 GHz) and professional SMA female connectors with a bonus adapter, this compact filter is engineered for RF pros seeking pristine signal clarity in challenging environments.

Have a Question? See What Others Asked

Has anyone tried this (with sma-to-f adapters) for tv use? this would result in 50-ohm to 75-ohm mismatch. hard to find traps for tv use.

Does this have RG6 cable connections?

What is the max RF input of this device?

I am trying to target 108 mhz specifically. is there a schematic if i need to alter something? (of course, voids any returns) maybe from 107 to 109 m

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582 DH

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Brand Name	RTL-SDR Blog
Item Weight	0.634 ounces
Package Dimensions	3.94 x 2.56 x 0.59 inches
Item model number	4330366327
Is Discontinued By Manufacturer	No
Color Name	Black

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

Details

Description

Specifications

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