Problem after KPA100UPKT upgrade

[scramac]

I just upgrade my K2/100 with the KPA100UPKT upgrade last night but somehow I'm not getting any power out >10watts.   I thought I checked all my work before I assembled it back.   I have a Rev B KPA100 board and my K2 is SN 1866.  Could you point me to how I should go about figuring out what could be wrong with my K2?

Thanks for the help

Sam

N2MXY

[Don Wilhelm-4]

Sam,

I suggest you download the current manual for the KPA100 and begin with
the diode voltage chart, then if necessary proceed to the DC voltage
chart.  It is difficult to say what is going on without some reference
information.

When making the measurements, be certain to observe the >10 watts and
the < 10 watts columns.

For a visual check, be certain you put the toroid leads in the correct
holes.  Is there any chance you put the resistor on the bottom of the
board in the wrong place - that would cause the problem you are having.

73,
Don W3FPR

On 11/22/2011 9:17 AM, scramac wrote:

> I just upgrade my K2/100 with the KPA100UPKT upgrade last night but somehow
> I'm not getting any power out>10watts.   I thought I checked all my work
> before I assembled it back.   I have a Rev B KPA100 board and my K2 is SN
> 1866.  Could you point me to how I should go about figuring out what could
> be wrong with my K2?
>
> Thanks for the help
>
> Sam
>
> N2MXY
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/Problem-after-KPA100UPKT-upgrade-tp7020566p7020566.html
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[scramac]

Don,
I made some diode voltage checks and here is what is got:

            Anode                                        Cathode
D9         ref: 1.41   (13.6 actual)              ref: 13.8  (13.3 actual)
D10       ref 0.0      (0 actual)                   ref: 14.1  (13.6 actual)

            Anode
D11       RX 0-10w   ref 14.1  (actual: seem floating in mv range)
            RX 11-110w  ref 1.5  (actual: seems floating in mv range)

D12       RX 0-10w   ref 14.1  (actual: 1.4V)
            RX 11-110w  ref 1.5  (actual: 3.6V)

D13     RX 0-10w   ref 14.1  (actual: 13.6V
          RX 11-110w  ref 1.5  (actual: 1.4V)

D14     RX 0-10w   ref 14.1  (actual: 13.6V)
          RX 11-110w  ref 1.5  (actual: 1.4V)

Visual check doesn't show anything wrong.  Any thoughts on what could be going on here?

Thanks for the help

Sam

[Don Wilhelm-4]

Sam,

Sorry for the delayed response, it has been a busy day and have not had
a chance to get to my email.

OK, the voltages on D11 seem out of "wack" - so check the tinning of L16
leads, the soldering of RFC4 and D11.

Once you get proper RX voltages on D11, try the TX diode voltages if it
still does not work.

73,
Don W3FPR

On 11/22/2011 11:53 PM, scramac wrote:

> Don,
> I made some diode voltage checks and here is what is got:
>
>              Anode                                        Cathode
> D9         ref: 1.41   (13.6 actual)              ref: 13.8  (13.3 actual)
> D10       ref 0.0      (0 actual)                   ref: 14.1  (13.6 actual)
>
>              Anode
> D11       RX 0-10w   ref 14.1  (actual: seem floating in mv range)
>              RX 11-110w  ref 1.5  (actual: seems floating in mv range)
>
> D12       RX 0-10w   ref 14.1  (actual: 1.4V)
>              RX 11-110w  ref 1.5  (actual: 3.6V)
>
> D13     RX 0-10w   ref 14.1  (actual: 13.6V
>            RX 11-110w  ref 1.5  (actual: 1.4V)
>
> D14     RX 0-10w   ref 14.1  (actual: 13.6V)
>            RX 11-110w  ref 1.5  (actual: 1.4V)
>
> Visual check doesn't show anything wrong.  Any thoughts on what could be
> going on here?
>
> Thanks for the help
>
> Sam
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/Problem-after-KPA100UPKT-upgrade-tp7020566p7023201.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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