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.

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.

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.

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.

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📡 Block the noise, own the spectrum.

ULTRA LOW SIGNAL LOSS - Insertion loss under 0.5 dB up to 1 GHz keeps your signal integrity intact.
PRECISION FM BAND BLOCKING - Silences 88-108 MHz with over 50dB attenuation for crystal-clear SDR reception.
COMPACT LIGHTWEIGHT DESIGN - Weighs just 18g with a sleek black finish—perfect for on-the-go pros.
OPTIMIZED FOR SDR ENTHUSIASTS - Specifically engineered to enhance software-defined radio and scanner performance.
PLUG PLAY SMA COMPATIBILITY - Includes SMA female connectors plus a free SMA male-to-male adapter for seamless setup.

The Broadcast FM Block Filter by RTL-SDR Blog delivers professional-grade FM band suppression (88-108 MHz) with over 50dB attenuation and minimal insertion loss (<0.5 dB up to 1 GHz). Designed for SDR and radio scanner users, it features SMA female connectors and includes a free SMA male-to-male adapter, ensuring easy integration and superior signal clarity in a compact, lightweight form.

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Reviews

H**2

A very good receiver only filter that works! Not designed for transmit circuits.

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?

3.05.2021

Brand	RTL-SDR Blog
Package Dimensions	10.01 x 6.5 x 1.5 cm; 18 g
Item model number	4330366327
Manufacturer	RTL-SDR Blog
Colour	Black
Tuner Technology	FM, PAL
Are Batteries Included	No
Item Weight	18 g
Guaranteed software updates until	unknown

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

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