[CQ-Contest] RTTY contesting; filters

[Jim Brown]

On 2/16/2021 1:27 PM, Ed Muns wrote:
> I do like lower tones and typically use 915/1085 which is less fatiguing
> over long periods.  OTOH, their TX audio harmonic is still within the normal
> 2 kHz bandwidth for SSB transmitters when transmitting AFSK.  Not a problem
> for those of us using FSK.

And not a problem if audio levels are set properly. There's an app note 
on my website that describes several good ways to do it, depending on 
what you have available to check it. Those instructions are on page 3.

http://k9yc.com/USB_Interfaces.pdf

While the document is mainly describing USB audio interfaces, setting 
levels are the same if you're using the computer's built-in audio 
interface.

73, Jim K9YC