[Elecraft] K3 losing RF - problem solved

[Paul Ormandy ZL4PW]

Hi all,

I was less flustered today and did some more checking...

Discovered the main fuse in the negative supply line from the PSU had blown.

I would like to know what reason it could have blown and at this point, presume it was something to 
do with running 100W on 6M.

Thanks to all who e-mailed directly with suggestions.

Cheers,

Paul


> ----------------------------------------------------------------------------------------------------
> *From:* Paul Ormandy ZL4PW <zl4pw at orcon.net.nz>
> *To:* elecraft at mailman.qth.net
> *Sent:* Sat, January 1, 2011 11:22:39 PM
> *Subject:* [Elecraft] K3 losing RF
>
> Hi all,
>
> My K3 has developed a problem...
>
> Power output is down to 70W and the LCD back-light flickers on tx. The "Low Voltage" message flicked
> up briefly once.
>
> I suspect a DC power problem but so saying, the voltage at the rig is 13.9V on transmit at 70W and
> the rig is drawing 13A. The problem seems worse on the 6mb.
>
> If I reduce the output RF control to around 60W, there is no perceptible LCD flickering.
>
> I will obtain another 20A power supply tomorrow and see if the problem persists.
>
> In the mean time, (apart from running low power), can anyone suggest what I should start looking for
> internally?
>
> Kind regards,
>
> Paul
>
>
> -- 
> Paul Ormandy ZL4PW ZM4M
> www.radiodx.com <http://www.radiodx.com/>
> www.zl4pw.orcon.net.nz <http://www.zl4pw.orcon.net.nz/>
>
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-- 
Paul Ormandy ZL4PW ZM4M
www.radiodx.com
www.zl4pw.orcon.net.nz