[Elecraft] K3: 630m amplifiers

[dave]

Do we run into the FCC external amplifier 15 dB gain limit here?

73 de dave
ab9ca/4



On 7/26/15 7:51 PM, Joe Subich, W4TV wrote:
>
> 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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