NooElec Distill:FM Barebones - Broadcast FM Bandstop Filter for Software Defined Radio Applications

very good product

Substantialy reduced mirror signals from strong broadcast fm when using sdr on hf bands

Only FM broadcast I found to be a surprise that didn't filter altogether was Classic FM. Luckily I love classical music!. all the other broadcast filtered out I thought Radio 1 would have been the strongest but Classic FM wins ha! you can see my images on NooElec Sawbird +NOAA review.

Does what it says very good...

This actually works. I’ve had so many problems with interference from broadcast band and have tried all sorts. I purchased this on a whim not really expecting it to work all that well, however it works very well and only a tiny bit of interference still gets through. I mainly listen to airband and it works very well for that.

Worked as advertised, reducing broadcast FM interference into other bands of SDR receiver set up.

When this was placed in line I noticed NO. Difference!

I've just got into SDR radio with a Funcube dongle & was getting a lot of interference when trying to listen and record the downlink from weather satellites. There's a lot of transmissions of the same waveband in my area so I thought this may help.Tried it out last night & I have to say I didn't really see that much difference in the waveband of the FM frequencies being broadcasted near to me, so it didn't really reduce them by that much.Maybe it'll work better if I had a dedicated antenna for the 137mhz frequency for the satellites. But for now, it's not an amazing item.

Salve ho letto tante recensioni su questo filtro molte positive altre un po meno.Quindi ho deciso di fare una prova strumentale con analizzatore di spettro con TG.La curva non è lineare attenua poco agli estremi ma a 94 mhz oltre 50 db .Considerando il costo d' acquisto non male.Chiaramente ci sono filtri che hanno altre caratteristche ma hanno costi molto elevati

Remplis très très bien son objectif, indispensable avec un ampli .

work very well it block a lot of undesirable signals in a noisy place like in big city i love it!

This filter are for people who wants to preserve full signal at 118MHz and above and at 82MHz and below.It attenuates 20dB at 90Mhz and 103MHz. A 94MHz it has it deepest null at 40dB. It still has 30dB at 92MHz and 101MHz.There are other filters for people who needs much more attenuation at the FM broadcast band edges and doesn't care so much for VHF air band and the upper end of VHF-LOW.For most people if will do its job and are an excellent filter at this low cost. My scanner with CloseCall immediately detected a 390MHz transmitter in a tower 3km away and a mobile guy transmitting at 69Mhz 1km away when the filter was installed.

I have an older (when it was analog) "flying saucer" RCA TV antenna, which I added a digital TV 45 db "mast amp". In the path towards my city "antenna farm" location, I found 3 cell towers; one of them less than 3 miles. I also have an "amateur FM station", which has a low power setting (+/- 5 watts). And a 15 watts ERP "high power" mode. There's a similar rack version of this same 75 ohm setup, at 5, 10 & 150 watts, using another 5/8 wave Ramsey antenna. This low setting was... is an experiment using Blonder-Tonge ZFMSM CATV FM modulators (yeap, it's 75 ohms). Both, the 75 ohms dipole I built using RG-8 cable & the 5/8 wave Ramsey antennas are 5 meters away from the "saucer" TV antenna. That "saucer" omni has a Radio Shack (RS) 12 db FM filter, but I wanted a bit more; just to overkill. So I took the connectors off. Soldered a pair of "F" female connectors & put the tiny board inside a sealed Altoids metal case. Then placed this Distill "SDR" FM filter between that RS FM filter. In hopes that the Distill's 50 ohm mismatched impedance, gets equalized with the next stage; an Antra ATF-600 4 & 5G LTE MATV cell phone filter (avoiding having to add a 25 ohm resistor load). The MATV mast amp is at 3/4 of gain (33.75 db's) & the FM transmitters audio chain includes a Behringer 15 band dual EQ. A Behringer SX3040 or an Aphex 104 Aural Enhancers... & lastly, the amazing Behringer DEQ-2496 feeding both modulators. Even as the FM mods have audio cut offs below 40 & over 15k, the DEQ-2496 is my last limiter/leveler/expander & audio band pass filter. If I'm listening or watching web radio or video streams, the audio gets an extra "FM DSP" treatment; using an old i7 4 core "lappy". Either with Winamp/Stereo Tool, or an EMU USB audio "dongle" & Stereo Tool Stand Alone version. Oh yeah, by the way. Both the 75 ohm dipole & the 5/8 wave antennas have Ramsey's FMLP1 FM band pass filters. Plus a single specific FM channel band pass I built, for the empty FM channel in my area which I'm "borrowing" (can't afford cavity filters). The audio is as good & even better than some public & commercial FM stations & as you can see, I take RF & audio filtering very, very seriously. I have an old not lately calibrated RF spectrum analyzer, but borrowed an FM Deviation analyzer & other FM measurement tools from... an engineer at a local radio station. Did tests & guess what ?. My "amateur FM station" does not overmodulates; drifts & pretty much "signal legal", even as legally... . Heck, my side bands won't interfere with any adjacent or far off FM channels... measuring or listening right next to my FM antennas. RF filtering is a delicate proposition & I'm so glad this Distill FM filter worked as good as I envisioned it will. My SDR "musings"... also use this filter with excellent results.