[Elecraft] K3 #281 Perceived Output Issue

[Joe Subich, W4TV]

 > With the 100w amp in place and the jumpers configured the data is
 > speculative as to which circuits are in operation.

It is not necessary to remove the 100W amp.  Simply dial the power
back below 12W and it will be bypassed.  Thus my procedure to check
power at 5.5/10 and 55/100 W ... using 5.5 and 55 avoids triggering
the power calibration routines which occur at 5.0 and 50 W.

Since the output is compressing at 60 to 80 Watts, the compression
point will be readily visible with the 5.5/10 and 55/100 tests.

73,

   ... Joe, W4TV


On 2/24/2016 8:34 AM, Jerry Moore wrote:
> Because there's a specific calibration process during build that's performed
> on the 10w system prior to installing the 100w amp.
>
> With the 100w amp in place and the jumpers configured the data is
> speculative as to which circuits are in operation.
>
> The key to troubleshooting is to isolate. Don't assume data. Measure. You
> stated that your wattmeter is "known good", how/how recently did you get the
> calibration checked? Verify switch settings for the ranges?
> I usually trip on the simple things that, if known, would make me appear
> simple minded...but we won't discuss my past lumberings... :)
>
> Since the PA is trivial to remove is there any good reason to not do so?
>
> Logical assumptions based on the data so far:
> 1. The 100w amp is working by netting greater than 10w
> 2. We don't know the status of the 10w amp but since it drives the 100w amp
> we're getting something out of it.
> 3. We don't know how much power the 10w amp is outputting at full drive.
> 4. The rig was most likely OP assembled or an add on installed --- you may
> clarify the case here.
> 5. Wiring is suspect - Personally I had challenges here when installing the
> ATU and some other things.
>
> When an assembled system is new, always suspect connections/configuration.
>
>
> Jerry Moore
> CDXA, INDEXA, SKCC, Fists
> AE4PB, K3S - S.N. 010324
> http://www.qrz.com/db/AE4PB
> An Amateur is - Considerate, Loyal, Progressive, Friendly, Balanced, and
> Patriotic.
>
>
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