[Elecraft] K3: 630m amplifiers

[Joe Subich, W4TV]

Don,

WSPR, JT65 and JT9 are (1 of N tone) FSK modes.  They are no
different than conventional AFSK (1 of 2) in that the tones
are continuous phase, constant amplitude and can be amplified
by a class C amplifier without generating undue IMD or clicks.

I haven't seen the details of WSQ yet - if it is a multiple
simultaneous tone mode it would require a linear amplifier -
but the other listed "sound card" modes are fine with an
amplifier that operates in class C (or even a switch mode
amplifier so long as the bandpass filter is sufficient).

73,

    ... Joe, W4TV


On 2015-07-26 8:32 PM, Don Wilhelm wrote:
> Tom,
>
> Soundcard sourced digital modes are really SSB signals and need a linear
> amplifier.
>
> 73,
> Don W3FPR
>
> On 7/26/2015 8:25 PM, Tom Azlin W7SUA wrote:
>> Hi Ed.
>>
>> I am more interested in a non-linear class C or higher amp for those
>> bands as was not thinking to run modes that need a linear amp. WSPR, a
>> WSJT mode, WSQ, and the like.
>>
>> 73, tom w7sua
>> Chino Valley AZ
>>
>> On 7/26/2015 1:23 PM, Edward R Cole wrote:
>>> With the recent expansion of use to 630m for the K3s and upgraded K3
>>> which only transmit at nom 1mw, a question arises:
>>>
>>> Is there interest in a linear amplifier taking 1mw drive to produce
>>> either 25w or 100w?
>
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