Re: K3: KPA3 Squeal *SOLVED*

[AB3LS]

Just realized that I keep referring to the amplifier as the KPA100 which
was for the K2.

This problem is pertaining to the K3 and the KPA3 (100W).

Sorry for any confusion I may have caused

73
DE AB3LS

On Wed, Jan 18, 2012 at 5:22 PM, Geoff Wolf AB3LS
<[hidden email]>wrote:

> For those wondering, here's a link to a recording I made of the sound back
> when I was having a problem:
> http://liltechdude.com/files/Recordings/kpa3squealrev2.mp3
>
> I ran it through a spectral analyzer and produced this:
> squeal.png (image/png) 202K<https://mail.google.com/mail/?ui=2&ik=c5b17c1439&view=att&th=134f2e88d2107ef7&attid=0.1&disp=safe&realattid=f_gxkx14rr0&zw>
>
> 73 DE AB3LS
>
>
> On Wed, Jan 18, 2012 at 3:06 PM, Joe Harris <[hidden email]>wrote:
>
>> Thanks for the update, Geoff. I will contact Elecraft support to inquire
>> about a possible PA replacement.
>>
>> 73
>>
>> Joe- N1QD
>>
>>
>> On Wed, Jan 18, 2012 at 2:39 PM, Geoff Wolf AB3LS <
>> [hidden email]> wrote:
>>
>>> I had some questions about this issue mailed to me.
>>>
>>> Here's my update.
>>>
>>> Elecraft sent me a replacement KPA100 and KPA I/O board, of which I
>>> replaced myself.
>>>
>>> The new amplifier and I/O board fixed the problem. No more 12KHz
>>> resonation
>>> coming from the internals of the radio in test, low, and high power
>>> modes.
>>> The closest thing I can compare the sound to is the electrical resonation
>>> of a cathode ray tube in a TV, however, it's not as clean.
>>>
>>> Possibly a cold solder joint or bad connection between the amplifier and
>>> I/O board? I don't know.
>>>
>>> 73
>>> DE AB3LS
>>>
>>> On Fri, Jul 29, 2011 at 4:29 PM, Bill W4ZV <[hidden email]>
>>> wrote:
>>>
>>> >
>>> > AB3LS wrote:
>>> > >
>>> > > No go.
>>> > >
>>> > > Hooked the radio up to a gel cel battery and we're still getting the
>>> > 12Khz
>>> > > junk coming from something and the clicking between TX and RX.
>>> > >
>>> > > I made a longer recording of the 'junk' and posted it. Cycled
>>> between TX
>>> > > and
>>> > > RX a few times using the manual TX button on the front. Then
>>> finished off
>>> > > with a few dits and dahs. All while in TX Test mode.
>>> > >
>>> > >
>>> >
>>> http://alien.liltechdude.com/files/index.php?dir=Recordings/&file=kpa3squealrev2.mp3
>>> > >
>>> > > Anyone from Elecraft have anything on this?
>>> > >
>>> >
>>> > FYI I noticed the same on my #4717 kit (delivered last September).  I
>>> > normally use headphones so I never noticed it before.  I believe ~12
>>> kHz
>>> > was
>>> > getting into the DSP chain before the LPF mod to the DSP board was
>>> done so
>>> > perhaps that's a clue.  BTW I have no switching PS anywhere and this is
>>> > definitely coming from the K3 itself.
>>> >
>>> > This would be VERY annoying to someone with good hearing in a quiet
>>> shack.
>>> > I can minimize it by slight head movement (standing waves) but that's
>>> not a
>>> > good solution.
>>> >
>>> > 73,  Bill
>>> >
>>> >
>>> > --
>>> > View this message in context:
>>> >
>>> http://elecraft.365791.n2.nabble.com/K3-KPA100-Squeal-tp6518460p6634869.html
>>> > Sent from the Elecraft mailing list archive at Nabble.com.
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>>
>>
>>
>> --
>> Joe Harris, N1QD
>>
>
>

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