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.
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This Item  ADS-B Dual 978 MHz + 1090 MHz Band-Pass SMA Filter |  |  |  |  |  | |
| Price | Currently unavailable. | $43.99 | $89.00 | $59.95 | $44.95 | $17.95 |
| Delivery | — | Get it as soon as Monday, Apr 29 | Get it as soon as Tuesday, Apr 30 | Get it as soon as Tuesday, Apr 30 | Get it as soon as Tuesday, Apr 30 | — |
| Customer Ratings | ||||||
| Easy to install | ||||||
| Value for money | ||||||
| Weatherproof | ||||||
| Sold By | — | Tenmory | antenna manufacturer | AirNav Systems | ADSBexchange | RTL-SDR Blog |
| number of channels | — | 2 | — | 1 | 2 | — |
| maximum range | — | 10 feet | 300.0 miles, 500.0 miles | 300000 meters | — | 3 meters |
| impedance | 50 ohm | 50 ohm | 50 ohm | 5 ohm | 50 ohm | — |
| antenna description | — | ADS-B | flightaware ads-b 1090mhz antenna | Radio | 5.5db Collinear Antenna | — |
Reviews with images
Amazing value! Works as advertised. Good quality.
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.
Top reviews from the United States
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Reviewed in the United States on June 6, 2016
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.
Amazing value! Works as advertised. Good quality.
Reviewed in the United States on June 6, 2016
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+.Reviewed in the United States on June 6, 2016
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.
Images in this review
Reviewed in the United States on February 11, 2016
Reviewed in the United States on October 23, 2018
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.
Images in this review
Reviewed in the United States on November 12, 2020
Incredible Performance Increase for ADS-B
Reviewed in the United States on November 12, 2020
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!
Reviewed in the United States on November 12, 2020
Images in this review
Reviewed in the United States on July 10, 2018
Reviewed in the United States on October 8, 2018
Top reviews from other countries
Mitchell Herf
Well-built. Effectivly eliminates out of band interference and desensitization
Reviewed in Canada on May 30, 2021
