[Elecraft] K3 RFI in transmitted audio

[Felipe Ceglia]

2010/9/11 Felipe Ceglia <felipeceglia2 at gmail.com>:
> well...
>
> FT2000 is fed by its own internal PS.
>
> K3 is being fed by an alinco DM330 PS, and I have wounded a choke on a
> flyback toroid on the K3 red/black PS wire. (I havent actually checked
> its characteristics on VNA)
>
> microham is being fed from K3 12v port.
>
> I use no external speaker, but a heil headset
>
> the RFI gets into TX audio, blurring it a bit.
>
> I cant stop TX 2 rigs at once, as we are running WAE contest, and we
> are alowed to do so.
>
> Probably computer tied to k3  has pin 1 problem, as I am using its
> onboard soundcard. I will replace it later with a pci soundcard with
> pin1 fixed.
>
> Thanks for your help & attention,
>
> Felipe - PY1NB
>
> 2010/9/11 Joe Subich, W4TV <lists at subich.com>:
>>
>>  > When rig B TX, depending on band, it gets into K3 TX audio.
>>
>> Use standard audio decoupling techniques ... use separate power
>> supplies for each transceiver and the microKEYER.  Do not use
>> Mic + Line with the K3, make sure that any external power supply
>> does not tie V- to chassis (and/or third pin on the power cable),
>> add decoupling (common mode) chokes to the power supply cables,
>> use common mode chokes on all antenna cables and don't transmit
>> on both radios at the same time.
>>
>> 73,
>>
>>    ... Joe, W4TV
>>
>>
>> On 9/11/2010 9:37 AM, Felipe Ceglia wrote:
>>> Hi Jim
>>>
>>> Here is the setup:
>>>
>>> rig A:
>>> K3
>>> heil proset on front panel
>>> pc audio on rear plugs
>>> cat plugged via microham microkeyer
>>> nothing plugged on cw key jack (that minimized rfi a bit, it was
>>> coming from microkeyer)
>>> JRC 1kw amp
>>>
>>> rig B
>>> ft2000
>>> cat cable to pc
>>> icom pw1 amp
>>>
>>> The antennas are all near the shack.
>>>
>>> When rig B TX, depending on band, it gets into K3 TX audio.
>>>
>>>
>>> 2010/9/11 Jim Brown<jim at audiosystemsgroup.com>:
>>>> On Fri, 10 Sep 2010 21:35:49 -0300, Felipe Ceglia wrote:
>>>>
>>>>> When second rig is TX on 80m, I get the whole audio being coupled by the K3.
>>>>
>>>> Please give more detail about your problem. Are both radios transmitting at
>>>> the same time? Both K3s, or one a different radio? Is there a computer
>>>> feeding either radio?  Where do you hear the RFI?  Where do the radios get
>>>> their DC power?  Exactly. What kind of power supply? Is the V- terminal
>>>> bonded to the chassis at the power supply?
>>>>
>>>>> Is this a common issue?
>>>>
>>>> It depends on the details of your problem.
>>>>
>>>>> Any tips to solve?
>>>>
>>>> It depends on the details of your problem. :)  Once we hear more details, we
>>>> can give some ideas.
>>>>
>>>> 73, Jim K9YC
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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>>>
>>>
>>>
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>
>
>
> --
> Felipe Ceglia - PY1NB
> -------------------------------------------------------------------------------------
> PR1T team member /// Rio DX Group member /// Araucaria DX Group member
> http://www.dxwatch.com /// http://reversebeacon.net ///
> http://riodxgroup.dxwatch.com
>



-- 
Felipe Ceglia - PY1NB
-------------------------------------------------------------------------------------
PR1T team member /// Rio DX Group member /// Araucaria DX Group member
http://www.dxwatch.com /// http://reversebeacon.net ///
http://riodxgroup.dxwatch.com