[600MRG] FT Question Answered?

[Ben Gelb]

Why?

The rf out of the driver TX should be a pure sine function? Why should the
PA care if AFSK was used to generate it?

So long as the output is single tone and continuous phase I'm not sure why
it should matter?

(Neglecting "key clicks" at startup/shutdown)

On Jan 13, 2018 10:48 AM, "Bill Cromwell" <wrcromwell at gmail.com> wrote:

> Hi Frank,
>
> That is what I was going to say in reply to your latest query. If you are
> using audio modulation in upper or lower sideband SSB non linear amps will
> ruinate and splaterate it.
>
> 73,
>
> Bill  KU8H
>
> On 01/13/2018 10:47 AM, Frank Lotito wrote:
>
>> I may have answered my question - We use AFSK not direct FSK to generate
>> modulation modes such as FT8.  AFSK as I recall requires "linearity" in the
>> audio processing stages.  But once in the RF domain we can use non-linear
>> devices, such as heterodyne converters, Class E amps, etc.  Did I get that
>> correct?  73 Frank K3DZ  / WH2XHA
>>
>> Get Outlook for Android<https://aka.ms/ghei36>
>>
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