[Elecraft] K3: 630m amplifiers

Tom Azlin W7SUA tom at nilza.org
Sun Jul 26 21:59:15 EDT 2015


Not if you build your own is my understanding!

73, tom w7sua

On 7/26/2015 5:56 PM, dave wrote:
>
> 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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