ADS-B Dual 978 MHz + 1090 MHz Band-Pass SMA Filter

This is an excellent filter. Especially considering the price. The name "ADS-B 1090MHz" leads one to believe it's only for 1090MHz but it is actually a rather wide bandpass filter covering 978MHz as well. I measured this unit on my Site Master S120 in gain/insertion loss mode (didn't feel like setting up the HP SA and sweeper) and my results are similar to a previous reviewer. Approximately 1.6 dBm loss at 978MHz and 1.1 dBm loss at 1090MHz. Attached photos show the results. (Don't mind the squigglies on the screen - the LCD was damaged due to cold weather.) Subtract 2.0dBm from the values on the screen to account for cable and connector losses. 3dBm edges are at 943 and 1183 and 20 dBm down are at 906 and 1233 so it's got fairly steep skirts. In practice it works well and I found that using this filter and the FlightAware SDR stick with the built-in LNA captured significantly more aircraft than a basic NooElec Nano2+.That said, it would be better to have a narrow filter with about 5MHz bandpass at 1090 and a separate narrow filter with 5MHz bandpass at 978. Why? Well, the SDR's have no front-end filtering and with a bandwidth of 943 to 1183MHz everything in that range is presented to the SDR device including transponder outputs and all kinds of other aviation related signals we don't care about which can overload the input of the SDR.Even though it's a very wide-band filter and I'd prefer to have a more narrow 1090MHz specific filter, I give it five stars because the build quality is good, it works better than anything else available in this price range, and it's an amazing value. Until I find some narrow 978 and 1090 specific filters this is what I recommend.

This filter works great. I have a TRS tower not half a mile from my Antenna & when I went to put an amp on my ADS-B antenna my reception just died. It was believed that I was amplifying the RFI & overloading. So, placed this little gem from the antenna and then on the way to the receiver I placed the amp - now I'm really pulling in the signals. Maybe, doubled my reception range? If not doubled, pretty darn close. If you want to do ADS-B in a serious way, this is a must have. The price is fair for the results it brings.Placement is as follows: ANT - THIS FILTER - AMP - RECEIVERUPDATE: This filter has died. Far to early & out of warranty/return eligibility. It worked so well for awhile but I can't afford to replace this filter every other or every few months.UPDATE: After trying to get this resolved (see comments) I gave up. I tried again here towards the end of July. I got to talk to people! In a nutshell, it was my fault it died. I didn't realize that these are NOT WATERPROOF - I was using mine outside on the antenna's mast. Even so, they wanted to send me a replacement. It just arrived & I wanted to update my review. So, do not place these filters outside without some sort of WATERPROOF protection! TYVM FlightAware!

Insertion loss is is -1.35 dB at 1090 MHz. The filter response is good, with the passband spanning from 942 to 1187 MHz. I would like to see lower insertion loss, and would be willing to trade that off for filter response. I use the FlightAware 5.5 dBi (i.e. 3.3 dBd) antenna, fed with 40 feet of LMR-600. The combined insertion loss of the filter and the feed line cancels most of the gain of the antenna. The -1.35 dB insertion loss of the filter cuts down the number of aircraft observed each day from just over 600 aircraft per day to just under 500 aircraft per day. I'd run without the filter if I didn't have a 500-watt transmitter antenna 12-feet away from the ADSB antenna. The attached plot (performed with a normalized and calibrated spectrum analyzer) shows that the filter does function quite well at the job it was designed to perform.

After having my old ADS-B system break, I had to purchase new equipment to replace it. The new equipment I purchased was almost the same as the old equipment but the range was terrible. I purchased this filter for my antenna and my range increased by almost 10x. I'm now receiving signals from about 4x the aircraft from before without having to upgrade my antenna or make major modifications. This is a must have for anyone with a DIY ADS-B receiver!

I love the quality of this and it sure does filter! I don't have a problem with the ADS-B 1090MHz FlightAware filter but when I use it with the LNA I bought all of my reception and airplanes drop to zero! It's not the filter either but the LNA is the culprit as it alone will cause all the aircraft to drop to zero. I'll post this same message on the LNA review that I bought. Does anyone have a cure for this? It's installed with the RF in at the antenna and the RF out going to my SDR antenna input. Thank you.

I've been enjoying learning more about ADS-B and have had fun putting together a Raspberry Pi running PiAware to see what's flying by my window. While the plan is to ultimately mount an antenna outside, I'm first learning/tweaking the setup indoors with a 1090 antenna propped up against the interior of a window.As I live in a congested urban area, and I happen to know there's a cell tower about 2500 feet from my house, I figured I'd try out the SMA filter *despite* my already owning the FlighAware ProStick Plus with the built-in filtering. Putting the SMA filter own increased the traffic I could pick up by a factor of two, and it extended my visible range by about 1.4 nm.The range and numbers are much greater when I do a comparison while my hand holds the antenna outside the window. Once mounted externally I'll have a much fuller view of the regional sky.

Bought this to diagnose a traffic hole towards the nearest cell tower. Filter dropped real-time aircraft count of around 10% and improved traffic near the cell tower, but not enough to leave it inline. Rig consists of a FA Pro Stick Plus, 26" antenna (in attic) and a RPi3(B) hardwired to the network with stock gain settings. Filter may help if cell towers are relatively close and numerous in the area.

Effective. Solid construction. Negligible insertion loss.

excellent product. works fine.

I use a FlightAware Pro blue USB receiver. Based on previous reviews, I initially avoided buying this filter as this receiver supposedly has a filter already built in. I live in a city area with multiple mobile phone towers around. I would not have believed the improvement on my ADSB receiver system had I not taken before and after figures. Immediately after fitting the filter, range has improved by approximately 25nm and traffic throughput increased by 20%. Noise is greatly reduced. Well worth the effort of fitting this quality filter.

Arrivato con un giorno di ritardo rispetto quanto indicato. (amazon Prime)Ottimo prodotto, come tutti quelli commercializzati dalla FlightAware.Molto consigliato per chi lo utilizza ingrossi centri urbani pieni di "rumore". La perdita di inserzione si nota. Dipende molto dal guadagno dell'antenna al quale è abbinato.Lo utilizzo per prove e gioco e ne sono più che soddisfatto. Anche se in alcuni casi non serve, anzi.

Depende de la contaminación electromagnética de tu zona puede resultar útil, yo lo utilizo con FR24 y RB24 y sin problemas, en mi caso suele ser útil en verano cuando la propagación es muy fuerte, en invierno prefiero que entre cable y antena haya el mínimo de conexiones posibles.