[Elecraft] K2 K2/100 post FD review

[Don Wilhelm]

Mike,

No, the KPA100 wattmeter will display the actual power being produced if 
it is well calibrated.
That is not necessarily the same as the requested power, although with a 
properly working KPA100 and a calibrated KPA100 wattmeter, the reading 
should be the same.

73,
Don W3FPR

On 6/28/2020 9:41 PM, Mike Kopacki wrote:
> I can run through some of the items you suggest. But I don’t have an 
> external wattmeter that can measure 100 watts. I do have a QRP wattmeter.
>
> I will start tomorrow to try and work through the question.
>
> But to be completely accurate...you are saying that the KPA100 
> wattmeter (which is what I see when pressing TUNE and DISPLAY 
> together), should read the same as the REQUESTED power (which is what 
> the power knob sets)?
>
> Thanks,
> Mike NJ2OM
>
>> On Jun 28, 2020, at 8:58 PM, Eric Norris <norrislawfirm2 at gmail.com> 
>> wrote:
>>
>> 
>> Congratulations, Mike!  Please let us ALL know how it goes, as we of 
>> the K2 clan learn something with every post.
>>
>> 73 Eric WD6DBM
>>
>> On Sun, Jun 28, 2020, 2:12 PM Mike Kopacki <mikekopacki at gmail.com 
>> <mailto:mikekopacki at gmail.com>> wrote:
>>
>>     Well, that gives me something to do!  I’ll let you know how it goes.
>>
>>     Thanks,
>>     Mike NJ2OM
>>
>>     > On Jun 28, 2020, at 4:41 PM, Don Wilhelm
>>     <donwilh at embarqmail.com <mailto:donwilh at embarqmail.com>> wrote:
>>     >
>>     > Mike,
>>     >
>>     > Congratulations on finishing the K2/100.
>>     >
>>     > On the power output variation, that is not normal.
>>     > First check the voltage delivered to the K2 while in transmit.
>>     > You should do that by tapping DISPLAY and scrolling to the
>>     voltage display.  Your power source should provide at least 13.8
>>     volts, but higher (up to 15 volts) is better.  If the voltage
>>     shown by the K2 display during transmit is less than 12.6, make
>>     certain all power cable connections are tight.
>>     >
>>     > If the power supply voltage is not the problem, then remove the
>>     KPA100 from the base K2 and realign the bandpass filters. 
>>     Connect a dummy load to the base K2 BNC ANT jack.  After that,
>>     check the maximum power from the base K2 - you should have at
>>     least 10 watts on each band.  Record the power for each band.
>>     >
>>     > Using a dummy load takes away any question about your
>>     antennas.  Always check into a dummy load - with an in-line
>>     wattmeter if necessary.
>>     >
>>     > The other possibility is that you have a problem in the Low
>>     Pass Filter in the KPA100.  To check for that, re-install the
>>     KPA100, but power the base K2 from the coaxial power jack (no
>>     power to the KPA100 - connect the dummy load to the SO2339 jack
>>     on the KPA100.
>>     > Again check the maximum power on each band from the base K2. 
>>     It should be no more than 5% less than you found with the base K2
>>     only.
>>     > If there is a substantial difference in power, then check the
>>     KPA100 Low Pass Filter - particularly checking the number of
>>     turns on the toroids.
>>     >
>>     > 73,
>>     > Don W3FPR
>>     >
>>     >
>>     >> On 6/28/2020 4:04 PM, NJMike wrote:
>>     >> I did notice a variation on the power output on different bands:
>>     >> 80m - 100w
>>     >> 40m - 100w
>>     >> 20m - 80w
>>     >> 15m - 50w
>>     >> 10m - 30w
>>     >> SWR was never above 1.3-1.
>>     >> Does that sound normal?
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