On 12/24/2025 8:43 AM, Tom Bowles via Elecraft wrote:
I'm considering adding a 1.8 kHz for SSB and a 250 Hz for CW, but I've read
that the 250 Hz filter often measures wider in practice (around 330-350 Hz) and
may not be as sharp as expected. Has anyone experienced this, and would you
recommend it, or suggest alternatives like the 200 Hz or 400 Hz instead?
First, these are ROOFING filters to protect the DSP IF from overload
from very strong nearby stations. It is that DSP that sets the IF
bandwidth. I'm a serious contester, and have used K3s since 2008. The
250 Hz 8-pole filter is great for CW. I found the 1.8 kHz filter too
narrow for SSB, and prefer the 2.1 kHz filter. If you work RTTY, the 2.8
kHz filter has much better response than the stock 2.7 kHz filter, which
greatly reduces the incidental AM on transmit with RTTY. If you don't do
RTTY, it doesn't matter.
73, Jim K9YC
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