[Elecraft] Re: KAT2 - Problem with power calibration (calp)

[Zac Brown]

Don,

I was thought I was adjusting R1, but was actually adjusting R2 :)
Everything is working fine now.

Thanks,

Zac
KD5IEF

Don Wilhelm wrote:
> Zak,
> 
> Have you adjusted the forward power trimmer pot on the KAT2 to match the
> power that you measure on the DL1?  If not, that is what you must do.
> 
> Once you set the fwd pwr pot correctly, the K2 microprocessor should display
> the power output properly with a TUNE+DISPLAY operation.
> 
> If that does not happen, you should follow the schematic in the KAT2 for the
> VRFDET output and trace it back to the control board to see why it is not
> showing the correct level.
> 
> Another question - do you have the K60XV installed.  If you do, change R6 in
> the KAT2 to 470 ohms as indicated in the K60XV manual.  Without the K60XV,
> the 47 ohm value for R6 is OK.
> 
> 73,
> Don W3FPR
> 
> 
>> -----Original Message-----
>> From: Zac Brown [mailto:zac_brown at mac.com]
>> Sent: Wednesday, September 27, 2006 7:44 PM
>> To: elecraft at mailman.qth.net; support at elecraft.com; w3fpr at arrl.net
>> Subject: KAT2 - Problem with power calibration (calp)
>>
>>
>> Fellow K2 builders,
>>
>> I have completed building the KAT2 autotuner, and have run into a
>> problem on the power calibration step (calp).
>>
>> The problem is that (on page 17) when I hit the tune button and run 5.0
>> watts into the KAT2, I'm only measuring about half that much at the
>> dummy load.  The dummy load I'm using is an Elecraft DL1.  When I
>> measure the voltage at the TP1 and ground test points on the DL1, I'm
>> only seeing about 8.5 volts.  That translates to about 2.9 watts.
>>
>> If I remove the KAT2 and repeat the test with the DL1 connected to the
>> K2's stock antenna jack, I measure about 12.2 volts at the DL1's test
>> points, which is about 5.9 watts.
>>
>> Thus far, the build has gone smoothly.  I have visually inspected
>> everything on the KAT2 and was quite careful during the build.  I had no
>> problems doing the "bridge null adjustment", and was able to dial in C55
>> to about 007.
>>
>> Any ideas?
>>
>> Thanks,
>>
>> Zac Brown
>> K2# 4907
>> KD5IEF
>>
>>
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>>
>