AM Broadcast Interference on my Flex 6400

W7HUT

We have several 50KW AM stations within a 10 mile radius of my QTH strong enough to occasionally lift the entire spectrum in sync with music or a voice. Are there recommended externbal passband filters to cut off everything below 1.8MHz?

KD0RC

Here are a couple of links to help build your own. In a quick search, I did not see any commercial units that are capable of handling 100 W transmit power, but I would be surprised if there are not some available somewhere...

https://vk3il.net/projects/broadcast-band-filter/

https://www.nutsvolts.com/magazine/article/filter-design-software

W7HUT

Thanks Len - since asking, I did a search and found one from Morgan KF7P and another from DX Engineering - both rated for 200W - may give one a try or whip one up myself - the 6400 is amazing sensitive (no complaints there)!

Mark Aaker K6UFO

Broadcast Band Filters good for over 100 watts at

https://www.kf7p.com/KF7P/Morgan_Filters.html

or

https://www.dxengineering.com/parts/dlw-fl1718

I've used both at various times to cut down AM Broadcast interference.

Mark K6UFO

W7HUT

Thanks Mark

Leaning towards the Morgan

Michael
W7HUT

W7HUT

Thanks Mark

Leaning towards the Morgan

Michael
W7HUT

Steve KD2OM

The company I worked for has used the DX engineering brick wall filter (when it was hand built by the designer) for installations of military radios that were suffering from proximity to an AM station. It was a 150 watt radio and mostly used for digital comms. The filter worked very well.

You also might look into notching the worst offender. A series cap and inductor to ground works.

73

Steve KD2OM

W7HUT

Thanks Steve - Have the Morgan on order, we'll see how it works...

Michael W7HUT