[Elecraft] K3 Low Output on 15

[K9MA]

Yes to all.  There's no question that something has changed within the 
K3.  15 was always marginal, with higher current at 100W than the other 
bands, but now the maximum current on 15 is lower than it used to be, 
which makes me suspect the LPA module.  When I recently did a new TxGain 
calibration, 15 did not change much, (HP 12 to 19), but 24 MHz did (HP 
08 to 46). LP calibrations changed by similar amounts.  However, output 
on 24 MHz is normal, as is the current.  The calibration did not change 
output or current on 15.

73,

Scott  K9MA


On 11/13/2016 22:37, W0MU Mike Fatchett wrote:
> Did you do a re-calibration?  Is this output confirmed on a external 
> meter?  Do the K3 and external meters agree is what I am asking.
>
> Is there some way you are getting rf back into the rig just in 15m?
>
> Does it do this on a dummy load?
>
> Have you taken the K3 completely out of line, no computer, no amp, no 
> tuners etc?
>
>
> On 11/12/2016 7:01 PM, Gary Gregory wrote:
>> Issue not seen on mine. Had it since January 2007 so maybe you have an
>> issue?
>> Gary
>>
>> On Nov 13, 2016 11:59, "WILLIE BABER" <wlbaber at bellsouth.net> wrote:
>>
>>> My 2014 purchased K3 is 20-25 watts low on 14mhz but all other bands 
>>> are
>>> good.  ....just haven't worried about it as I normally use 50 watts 
>>> or less
>>> to drive an amplifier.  I'll look into it after ARRL DX CW in 
>>> February, so
>>> long as it doesn't get worse.
>>>
>>> 73, Will, wj9b
>>>
>>> CWops #1085
>>> CWA Advisor levels II and III
>>> http://cwops.org/
>>>
>>> --------------------------------------------
>>> On Sat, 11/12/16, K9MA <k9ma at sdellington.us> wrote:
>>>
>>>   Subject: [Elecraft] K3 Low Output on 15
>>>   To: elecraft at mailman.qth.net
>>>   Date: Saturday, November 12, 2016, 3:37 PM
>>>
>>>   The output of my K3 (SN 4657) has
>>>   suddenly dropped 10-15 W on 15 meters,
>>>   from about 100 W to 85-90.  The other bands haven't
>>>   changed, nor has the
>>>   supply voltage (13.6 V at full power). Restoring to a
>>>   previous
>>>   configuration does not help.  I had a similar problem
>>>   early on, also on
>>>   15, and had to ship the K3 back to Elecraft, who replaced
>>>   the 10 W
>>>   module, but not the KPA3.  15 seems to be a problematic
>>>   band.  Has
>>>   anyone else seen a problem like this?
>>>
>>>   73,
>>>
>>>   Scott  K9MA
>>>
>>>   --
>>>   Scott  K9MA
>>>
>>>   k9ma at sdellington.us
>>>
>>>
>>> ______________________________________________________________


-- 
Scott  K9MA

k9ma at sdellington.us