[K3S] KLPA3A vs LPA

[Ing. Pasquale Speranza]

I have a problem on my K3S. Suddenly in SSB the radio started producing
splatters. It is very evident when comparing with a K3. Trying with spectrum
analyzer in CW the wave is perfect, the phase noise also ok. The problem
persists excluding the KPA3A. The ALC control seems to be ok. It's likely a
failure in the KLPA3A driver card. For troubleshooting can i insert the LPA
card of the K3 in the K3S ? Are this cards interchangeable ? Thanks

 

Pat,  I8QLS / N6QLS

 

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[Don Wilhelm]

Pat,

I do not believe they are interchangeable.  Contact [hidden email]
and they can provide some test points to help analyze the problem.

73,
Don W3FPR

On 12/21/2020 11:36 AM, Ing. Pasquale Speranza wrote:
> I have a problem on my K3S. Suddenly in SSB the radio started producing
> splatters. It is very evident when comparing with a K3. Trying with spectrum
> analyzer in CW the wave is perfect, the phase noise also ok. The problem
> persists excluding the KPA3A. The ALC control seems to be ok. It's likely a
> failure in the KLPA3A driver card. For troubleshooting can i insert the LPA
> card of the K3 in the K3S ? Are this cards interchangeable ? Thanks
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[KeithWE6R]

Hi Pat;
What are the results of the 5w TX gain calibration running the K3 Utility?
The LPAs are somewhat interchangeable, they don't always make full power
in some cases.
In any case, you MUST run the TX gain cal if you swap modules, so run it
now and it should reveal problems.
Keith WE6R Elecraft Tech

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