[RTTY] CONFIG:AFSK TX = FIL on K3

[Joe Subich, W4TV]

It is in the K3 DSP modulation process and affects all AFSK
audio sources.  The internally generated RTTY (CW to RTTY) is
FSK and does not involve the generation of audio tones.

73,

    ... Joe, W4TV


On 2014-12-02 12:47 PM, Dave Barr wrote:
> 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
>
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