[RFI] RFI Signature

[Jim Brown]

Hi Dave,

That wasn't my point. The filter would limit the useful width of the 
waterfall. I had suggested wider to potentially learn more, and also 
more data on when the source is present. One of the waterfalls showed it 
turning on, then off 10 sec later.

73, Jim K9YC

On 11/25/2025 4:19 PM, David Eckhardt wrote:
> To state the obvious:  Even the absolute best bandpass filter will not 
> eliminate in-band RFI.
> 
> Dave - WØLEV
> 
> On Wed, Nov 26, 2025 at 12:16 AM Jim Brown <jim at audiosystemsgroup.com 
> <mailto:jim at audiosystemsgroup.com>> wrote:
> 
>     On 11/25/2025 11:46 AM, Jeff (W4DD) wrote:
>      > I think the antenna is a StepIR vertical.  It seems to have a
>     narrow BW.
> 
>     I wouldn't expect it to be narrow on receive.
> 
>     I'm not familiar with Flex rigs. Elecraft has very good RX bandpass
>     filters on each band (or pairs of higher bands, and I would expect Flex
>     to do the same.
> 
>     Do you hear the noise on on other bands?