I recently purchased a KiwiSDR. Though I do not live in a large city, there are 3 different 5000 watt AM broadcast towers within 4 miles of my location, and a 1000 watt tower less than 1 mile east. This was causing constant ADC overloading in the Kiwi, with spurious signals across the whole range of the receiver.
The filter definitely works well. All of the local stations are attenuated by at least 18 to 20 DB, and the spurious signals in the waterfall are gone. It appears to have no attenuation on a local LF NDB on 245 KHz, nor on CHU at 3.330 MHz, so the bandstop limits appear to be as advertised. It has definitely improved the performance of the Kiwi on HF.
Another reviewer remarked that the antenna should be connected to the SMA jack marked “output” and the receiver connected to “input”. I tried it both ways, and it seemed to work exactly the same in either configuration.
My only concern is the way it was packaged for shipment. The filter is in a small plastic bag, which placed in a non-padded envelope. It arrived with no damage, but packaging it that way could easily result in the unit getting crushed in transit. I would recommend that the item be shipped in a small box.
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This Item  Distill:AM Barebones - Broadcast AM Bandstop (Notch) Filter for Software Defined Radio (SDR) Applications |  |  |  |  |  | |
| Price | $14.95 | $21.95 | $19.95 | $21.95 | $19.95 | $33.95 |
| Delivery | Get it as soon as Saturday, Jan 6 | Get it as soon as Friday, Jan 12 | Get it as soon as Sunday, Jan 7 | Get it as soon as Monday, Jan 8 | Get it as soon as Sunday, Jan 7 | Get it as soon as Thursday, Jan 11 |
| Customer Ratings | ||||||
| Sold By | Nooelec | Nooelec | Nooelec | Nooelec | Nooelec | Nooelec |
| antenna description | Radio | Radio | Radio | Radio | Radio | Radio |
| connectivity tech | Radio Frequency | Radio Frequency | Radio Frequency | — | Radio Frequency | USB |
| tuner technology | AM | AM | AM | FM | FM | am,fm,shortwave |
| platform | android | — | — | fly | — | windows, macintosh, linux, android |
| video output format | mpeg 4 | — | — | mpeg 4 | — | mpeg 4 |
| remote included | ✗ | — | ✗ | ✗ | ✗ | ✗ |
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Reviewed in the United States on January 3, 2019
The filter works as expected as far as I can tell. I've added a few photos of the filters performance as measured on a nanoVNA. The nano VNA was calibrated for to 50kHz to 3MHz range prior to taking the measurements.
As others have stated, 60dB of attenuation is a exaggeration. But it does attenuate signals from the AM broadcast band enough to be usable.
I used the filter with an upconverter and also with a SDR receiver with direct conversion. Once the filter was put online all the aliasing from local AM broadcasts was removed. As I only looked as signals above the AM band I can't report on its effectiveness on the LF and MF bands.
I am happy with the performance of the filter and would reccomend it.
As others have stated, 60dB of attenuation is a exaggeration. But it does attenuate signals from the AM broadcast band enough to be usable.
I used the filter with an upconverter and also with a SDR receiver with direct conversion. Once the filter was put online all the aliasing from local AM broadcasts was removed. As I only looked as signals above the AM band I can't report on its effectiveness on the LF and MF bands.
I am happy with the performance of the filter and would reccomend it.
Images in this review
Reviewed in the United States on March 4, 2018
I am using this filter on my Flex 5000a to receive WSPR on the 630 meter band with
Average attenuation 25db and NOT 40db as claimed !
Reviewed in the United States on March 4, 2018
Average attenuation is ONLY 25db and NOT 40db as claimed. I measured the response curve of 2 of these with Siglent SSA-3032X, HP-8591E and an HP-8712 VNA with identical results. But for $9.95 you can't expect it to work like a $50 filter.Reviewed in the United States on March 4, 2018
I am using this filter on my Flex 5000a to receive WSPR on the 630 meter band with
Images in this review
Reviewed in the United States on December 3, 2018
Reviewed in the United States on October 17, 2020
Top reviews from other countries
Rodolfo
Muy bien!
Reviewed in Mexico on March 18, 2022
Rodolfo
Reviewed in Mexico on March 18, 2022
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BASMAN
Does as it says reduces the medium wave broadcast band signals
Reviewed in the United Kingdom on July 22, 2021
