K9DP QRP AM Broadcast Interference BCI Ham Radio Filter Kit - for Xiegu X6200, X6100, X5105, G90, G106, SDR receivers, HF Amateur Radios

Both my (tr)uSDX and X6100 xcvrs were getting hammered by a local broadcast station. I was thinking of designing my own filter when I found this one. It is very easy to build, effective, and very affordable. I might order another so that I can pack one with each of my QRP kits. It really wants to see a near 50 ohm load on both the input and output. So it may not work well with a non-resonant antenna and internal antenna tuner.

I recently got a Xeigu G90 and its been a fun little POTA radio however depending on location of nearby AM stations, it quickly becomes unusable due to the weak front end of the radio. Radioddity has little to no customer support (would not recommend them, at all) so I had to find a different solution.I now can cruise all the bands without massive interference! Total game changer. Easy to assemble (was my 2nd time soldering).Well done K9DP! A+ quality, price and delivery! Highly recommend!

I have a Xiegu X6100, and a local AM station on 1300 KHz. On 17,15,12, and especially 10m bands, the station can be heard. This little filter totally eliminated the AM station. Assembly was straightforward, with some caveats - the toroids were easy to wind, but the wire is very thin, and using a sharp blade to remove insulation may result in nicks or accidental severing of the wires. Fine sandpaper might be better for this purpose. Also, the toroids tend to flop around a bit, so try not to allow too much flexing of the wires, as they might break. Second, you need a pretty hot soldering iron to solder the BNC connectors, and the barrel of the connector gets very hot, so be careful. I built mine with one of the supplied BNC, then used a short RG-58 jumper with a regular BNC that connects to the radio, so I would not need to carry an additional jumper.

This is a very nice and reasonably priced (I bought the kit) broadcast band (BCB) filter that is great if you don't want to use the 160 m band. It is small, light and therefore very portable, ideal for remote operation. I uploaded a couple images of spectrum analyzer scans of this filter and a more expensive one from PAR Electronics, their "Broadcast Band Eliminator". Marker 1 is the top of the BCB, marker 2 is the beginning of the 160m band and marker 3 is the beginning of the 80m band. As you can see, for 2X the price the significantly bulkier PAR also permits use of the 160m band. It's hard to beat the price, performance and size of the K9DF filter. The PAR filter, like all PAR equipment, is near engineering perfection.

Too small for my eyes to put together

Awesome little kit! Never made anything from a kit before, but my ugly solder joints worked like a charm. Needed a female to female BNC jumper, so don't forget to buy one of those as well. I only operate CW on the X6100, and never realized how much AM interference I was getting. I plugged the filter in and signals just popped out like crazy!! Money well spent.Edit:After a few activations, something has happened to the filter. I now have a 2:1 SWR when using the filter. When I remove it, I have 1:1. Not sure what happened to the device, but I don't use it anymore

This was a super quick build and really did the trick for me. I have a strong am/fm broadcast station a mile away. My qrp kits just bled their tunes. They were useless at home. This kit put a stop to that and it’s been a wonderful experience since. Perfect! De n5vwn

I had a new x6100 with AM frequency interference overloading the front end of my radio. Another ham operator suggested this filter. Took me about 30 minutes to build it, and it completely took away my front end AM interference. Worth the price to fix a headache.