[Elecraft] Audio volume problems

[hawley, charles j jr]

Speaking of changing out pots or encoders on the front panel, my four encoder knobs to the right of the column knobs were really stiff to push on. I mean so stiff, I don't think they could ever be removed without some sort of tool(s). Has anyone else had this issue and gotten the knobs removed? I bought extra knobs and thought if I had to remove them, I would maybe slice them along their length carefully with a dremel to release the tension and just replace them.

Sent from my iPad

On Jul 8, 2012, at 10:02 AM, "Guy Olinger K2AV" <olinger at bellsouth.net> wrote:

> Those knobs are actual potentiometers, not encoders, acting as voltage
> dividers off a fixed voltage, which are followed an an A/D chip which
> converts the wipe voltage to a three digit number which is multiplexed
> and sent to the MPU. The audio does NOT flow through the pot. The
> setting of the pot is turned into numerical advice to the MPU.
> 
> If the voltage on the pot wipe goes out of range or the wipe loses
> contact, the number sent to the MPU will be weird.  It won't be
> scratchy like an analog volume pot gone bad, just go to unpredictable
> and undesired volume settings.  The pots are not killer to change out,
> but you need moderate to good soldering skills to do it. I bunged one
> and had to change it out.  Done this on both my K2 and K3 now.
> 
> 73, Guy.
> 
> On Sun, Jul 8, 2012 at 10:40 AM, Matt Zilmer <mzilmer at verizon.net> wrote:
>> Many K3 users have seen this same rotation problem with the AF/SUB and
>> RF/SUB controls.  Try adjusting the set screw(s).  If that doesn't
>> work, you may need to contact support for new ones.  With early K3s,
>> there were some problems with these controls.
>> 
>> Not sure about your audio/volume problem though.  I'd contact support
>> on this too.
>> 
>> 73,
>> matt W6NIA
>> 
>> On Sun, 08 Jul 2012 08:45:35 -0400, you wrote:
>> 
>>> I suddenly came up with several problems related to audio volume on my
>>> K3, MCU 4.51.
>>> 
>>> I was listening on USB with slow AGC and I noticed that the volume would
>>> suddenly drop and remain low until I hit the T/R button, whereupon it
>>> would come back again, and then disappear.  I switched to fast AGC and
>>> the problem diminished but did not disappear.  So I reached for the
>>> audio volume control and discovered that it now turns 360 degrees
>>> without a stop, although there is a slight detent at the regular
>>> stopping point.  I tried to turn AGC off, and although the display
>>> indicates that it is off, there appears to be no increase in volume.  I
>>> now feel that the volume is lower than it was when I first built the unit.
>>> 
>>> There may be some troubleshooting to do here.  I notice this less with
>>> strong signals.  I guess I would like to know what to do about the
>>> rotation first, and then pursue the overall volume problem.
>>> 
>>> Thank you,
>>> 
>>> Jan, KX2A
>>> 
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