13 KHz filter works very well for AM. It provides +/- 6.5 KHz at IF which is plenty for even the guys with converted broadcast rigs that are generally +/- 5 KHz. The K3/K3S DSP and audio brick wall filters will limit the highest audio frequency to around 4.5 KHz but you can always use the DSP to further reduce the highest audio frequency to 2.8 - 3 KHz if needed to limit QRM. You can further reduce QRM by using the 2.7 or 2.8 KHz filter in synch mode to demodulate either just the upper sideband or lower sideband if one sideband is being clobbered by QRM. 73, ... Joe, W4TV On 2019-04-26 8:36 AM, Frank Krozel wrote:
On weekends here in the Midwest there are many AM nets (as well as the normal 3.880 Nets) that I like to listen to. I am curious as a CW guy, I would like to not take away from my already compliment of filters, 500, 200Hz to put in 6 and 13kHz filters, thinking of adding just the 13kHz filter. I also do 52.525. How would the 13kHz filter work for listening to AM? I assume I can start with that filter and use the variable to neck it down? Most of the signals are above S-9 that I listen to. de KG9H, Frank
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