[Elecraft] Question K3 ALC w/SPE Expert 1.3K-FA amp

[Oliver Dröse]

Luckily not everybody lives in the U.S. and is bound to the FCC 
restrictions. :-)

73, Olli - DH8BQA

Contest, DX & radio projects: http://www.dh8bqa.de


Am 03.04.2015 um 22:24 schrieb Eric Swartz - WA6HHQ, Elecraft:
> FCC rules specifically prohibit an easily removed or bypassed input 
> pad for exceeding the 15 dB gain limit.
>
> Eric
> elecraft.com
>
> On 4/2/2015 10:30 PM, Igor Sokolov wrote:
>> Joe,
>> As I was told, they ship it with the pad at the input to meet FCC 
>> requirement of  max 15db gain. But the pad can be easily bypassed. 
>> Just wonder, what is the reason for such a requirement?
>>
>> 73, Igor UA9CDC
>> ----- Original Message ----- From: "Joe Subich, W4TV" <lists at subich.com>
>> To: <elecraft at mailman.qth.net>
>> Sent: Friday, April 03, 2015 7:48 AM
>> Subject: Re: [Elecraft] Question K3 ALC w/SPE Expert 1.3K-FA amp
>>
>>
>>>
>>>> This is because the software in the amp automatically reduces the
>>>> power in the rig to the best output level for the amp (on the amp
>>>> LOW=500W out= 3W drive, MID= 1000W out= 6W drive, HIGH = 1500W out =
>>>> 9W drive). It works flawlessly. Actually, I could leave the power on
>>>> the Pro III untouched, and the amp reduces the power accordingly.
>>>
>>> Is SPE shipping amplifiers that violate type acceptance or did you
>>> modify that amplifier?  Any commercial amplifier sold in the US can
>>> have a maximum gain of 15 dB.  Your Expert 1.3K-FA shows 22 dB -
>>> nearly 6 dB above the limit.
>>>
>>> 73,
>>>
>>>   ... Joe, W4TV
>>>
>>>
>>> On 2015-04-02 10:34 PM, AB2E Darrell wrote:
>>>> Hello all,
>>>>         I am the proud new owner of a new K3. I am also the proud 
>>>> new owner of an SPE Expert 1.3K-FA solid state amp, and I have a 
>>>> question for the group regarding interfacing the K3 to the amp.
>>>>
>>>> My current setup is using my Icom 756 Pro III with the SPE Expert 
>>>> 1.3K-FA. The recommended setup for Icom was to connect both the 
>>>> Relay and ALC cables between the rig and amp. This is because the 
>>>> software in the amp automatically reduces the power in the rig to 
>>>> the best output level for the amp (on the amp LOW=500W out= 3W 
>>>> drive, MID= 1000W out= 6W drive, HIGH = 1500W out = 9W drive). It 
>>>> works flawlessly. Actually, I could leave the power on the Pro III 
>>>> untouched, and the amp reduces the power accordingly.
>>>>
>>>> My question for the group is, is there a way to allow the K3's 
>>>> output to be controlled by the amp? I see the note on p27 about not 
>>>> using an amp to control the K3's output, but wonder if there is a 
>>>> safe way to do it. For instance, could the K3 be set to say 15W out 
>>>> on all bands via the menu, then allow the amp to control the output 
>>>> via ALC for optimum drive?
>>>>
>>>> Any info and comments appreciated.
>>>> 73 Darrell AB2E
>>>>
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>>
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