[Elecraft] K2 Power meter

[Don Wilhelm]

Tom,

If the balun was in the circuit when you did the null, the result will 
be WAY off.
The tuner must be looking into a good 50 ohm load when adjusting for the 
null.

73,
Don W3FPR

Tom Campie wrote:
> I just realized something that may be throwing it off - I installed the
> Elecraft 4:1 balun inside the rig and hard wired it to ANT 2 on the tuner
> after I'd done the bridge null - is it possible that that has thrown off
> that null and I am not actually getting a 50 ohm load to the front end?
> I'll have to redo that tonight and report back.
>
> Thanks for the help so far.
>
> Tom
>
> On Sun, Jul 19, 2009 at 11:12 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:
>
>   
>> Tom,
>>
>> That is exactly what I said.  In CALP, if the load is anything other than
>> 50+j0, the power indication will be incorrect.  In other words, the
>> requested power may not equal the actual power.
>>
>> When you go to AUTO and do a TUNE, the forward power should be close to the
>> requested power.
>>
>>
>> 73,
>> Don W3FPR
>>
>> Tom Campie wrote:
>>
>>     
>>> I calibrated the tuner to a 50 ohm load on CALP.  With the tuner tuned  to
>>> a non-50 Ohm load, the requested power does not match the output  power by
>>> any definition of the word.
>>>
>>> Tom
>>>
>>> On Jul 19, 2009, at 9:48 PM, Don Wilhelm wrote:
>>>
>>>
>>>
>>>       
>>>> Tom,
>>>>
>>>> No adjustment is required.  In CALP state, the tuner must be working
>>>>  into a 50 ohm load for accurate power readings.  If you are  connected to
>>>> an antenna that has a feedpoint impedance other than  50+j0 impedance, you
>>>> can expect "unexpected" results.
>>>> When you change the ATU menu to Auto and do a TUNE, the tuner has  done
>>>> its job of providing a 50 ohm match to the K2 and the power out  will be as
>>>> requested.
>>>>
>>>> 73,
>>>> Don W3FPR
>>>>
>>>> Tom Campie wrote:
>>>>
>>>>
>>>>         
>>>>> This has been beaten over and over I think but I haven't found
>>>>> anything on it yet:
>>>>>
>>>>> I just got back from the lab at work and used a very well  calibrated
>>>>>  power meter to calibrate my KAT2 power meter.  Now on  40m at home, I  set
>>>>> my power control to 5w and tuner to Pout.  The  tuner now reads  2.9w.  Not
>>>>> until I tune the requested power to 8  watts or so does the  tuner say I'm
>>>>> putting out 5 watts.  Isn't  there a way to adjust it so  that the requested
>>>>> power matches the  tuner output power so that the S/ Power meter reads the
>>>>> right  value?  That's the most annoying part...
>>>>>
>>>>> Tom
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