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📻 enhance sdr signals with distill:fm barebones - efficient broadcast fm bandstop (notch) filter logo

📻 Enhance SDR Signals with Distill:FM Barebones - Efficient Broadcast FM Bandstop (Notch) Filter Review

4

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Average

Revainrating 3.5 out of 5  
Rating 
3.5
Radios, 🎧 Portable Audio & Video

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Description of 📻 Enhance SDR Signals with Distill:FM Barebones - Efficient Broadcast FM Bandstop (Notch) Filter

A high-quality, high-performance bandstop filter designed to attenuate broadcast FM for software defined radio (SDR) applications, with minimal interference to adjacent bands and tiny insertion loss. Bandstop design means the filter will pass DC (bias-t power). Makes a great companion to any SDR, but especially RTL-SDRs like our NESDR series, which can be easily overloaded by strong broadcast FM signals. Distill:FM has its filter circuitry fully shielded with an EMI frame, and has its front end protected by an ESD diode meant for RF applications. Designed and manufactured by Nooelec in the United States. Full 2 year product warranty direct through Nooelec.

Reviews

Global ratings 4
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    2
  • 4
    0
  • 3
    1
  • 2
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  • 1
    1

Type of review

Revainrating 1 out of 5

Useless. Didn't block S#! 7, and one of the two came with a crushed RF sign

I need to block very strong FM radio stations in my area. I brought two, one from my NOAA system and a spare. connected to SDR, started SDR#, switched to the FM broadcast band and was able to pick up all local stations. (See screenshot SDR#) It didn't block any of the FM stations at all. I can even see USS 107.9 WSRZ from Sarasota, Florida more than 30 miles south of my location. So it doesn't even block the normally weak signal at my location. I also tried it before and after my LNA and didn't

Pros
  • Great Price
Cons
  • Out of Style

Revainrating 3 out of 5

ONLY 6dB of attenuation

When I bought this the description said it had a much higher attenuation (e.g. 24dB), this unit doesn't even come close to matching that. In fact, 6 dB is written directly on the board (fine print on the back of the board). Please note that this is a bandpass filter or notch filter. My apologies for the blurry close-ups of the phone, but I have one and it says "<-3dB 82MHz - 115MHz" (This description is missing important details like FWHM? or what measurement was actually taken) "<-6dB…

Pros
  • Great for me
Cons
  • Easy to maintain

Revainrating 5 out of 5

Works as advertised

I needed a slight bandstop so our local VHF stations don't clog the front of my spectrum analyzer when using a small LNA with a pre-compliance test antenna. This little filter worked great. I used the tracking oscillator and spectrum analyzer to check the frequency response and the distillation filter and everything was fine. Out of curiosity I used NanoVNA to do the same check and indeed the S21 parameter matched exactly what I had seen with the correct SA. In any case, this little filter…

Pros
  • Crossing my fingers
Cons
  • Concerned

Revainrating 5 out of 5

I have a semi-complex MATV/CATV system. A plus.

I have an older (when it was analog) "flying saucer" RCA TV antenna to which I have added a digital TV 45db "mast amplifier". On the way to my town "Antenna Farm" I found 3 cell towers; one of them is less than 3 miles away. I also have an "amateur VHF transmitter" that has a low power setting (+/- 5 watts). And 15-watt ERP "High Power” mode. There is a similar rack mount version of the same setup in 75 ohms, 5, 10 and 150 watts, with a different 5/8 wave Ramsey antenna. It was a low attitude…

Pros
  • Confident
Cons
  • Functionality