[Elecraft] K3 - SPE Expert 1K-FA and ALC

[Guy Olinger K2AV]

Because if you are using something you can measure, like two tone, the
gains are already set and steady.  To measure leading edge distortions
before an AGC loop or loops bite and settle takes some pretty
expensive lab equipment, both before and after the transmitter/amp.
What you got?

It IS terrible advice.

73, Guy.

On Sat, May 15, 2010 at 4:25 PM, David M. Elliott
<immondizia at earthlink.net> wrote:
> If increased distortion is guaranteed, why doesn't it show on the spectrum scope?
>
> We are obviously missing something here.
>
> 73 de W6BK
>
>
> On May 15, 2010, at 11:03 AM, Vic K2VCO wrote:
>
>> Sorry, with all due respect this is HORRIBLE advice.
>>
>> I won't argue with those that say that the ALC should be connected for its protective
>> value. But it should not be depended on to control output level -- the exciter should be
>> adjusted to produce approximately the drive required for full output.
>>
>> The SPE Expert may have an exclusive design, but it is not exclusive enough to include a
>> time machine so that it can know how loud the operator is planning to talk, and it doesn't
>> control the delay inherent in the exciter's ALC circuitry.
>>
>> The result is guaranteed to be increased distortion.
>>
>> On 5/15/2010 4:25 AM, Björn Mohr wrote:
>>> 2010/4/22, LA8AW<oddyen at gmail.com>:
>>>
>>>
>>> Here is the statement from the developer of the SPE Expert 1K-FA - regarding
>>>> ALC, quoted from an early Expert Reflector:....
>>>>
>>>> I hope this will clarify the SPE Expert vs K3 - and ALC !!
>>>>
>>>> We really suggest to always leave the transceiver's output power manual control to
>>>> its maximum level because the EXPERT, thanks to its exclusive design, will provide to
>>>> control that level as long as the required optimal value will be reached.
>>
>>
>> --
>> Vic, K2VCO
>> Fresno CA
>> http://www.qsl.net/k2vco/
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