[RTTY] CONFIG:AFSK TX = FIL on K3

[Dave Barr]

Is this filter in the audio tx path, affecting AFSK tones generated by a 
computer sound card, or is it only in the internally generated RTTY 
capability of the K3?

73, Dave K2YG
========================================================
On 12/2/2014 6:59 AM, rtty-request at contesting.com wrote:
> Message: 5
> Date: Mon, 01 Dec 2014 15:58:48 -0500
> From: "Joe Subich, W4TV"<lists at subich.com>
> To:rtty at contesting.com
> Subject: Re: [RTTY] RTTY Tx options - advice requested
> Message-ID:<547CD688.3080604 at subich.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> ....
> _You probably had CONFIG:AFSK TX = FIL On which inserts a narrow filter
> around the selected tones__*in the K3 DSP Modulator*__.  That does a very
> good job of narrowing non-coherent AFSK and getting rid of any hum or
> harmonics introduced in the audio sages_.
>
> Unfortunately, that filter is unique to the K3 - none of the YaeComWood
> transceivers offer such a filter - and maladjusted AFSK is worse than
> the wider than optimal FSK they produce.
>
> 73,
>
>     ... Joe, W4TV