[Elecraft] K3 losing RF

[WILLIS COOKE]

Paul, look for voltage drop at the power poles.  Solder or crimping is critical 
and proper assembly is as well.  A fraction of an ohm will cause an unworkable 
voltage drop.  Look at the internal volt meter on the K3 display to identify 
excess voltage drop at the connection.
 Willis 'Cookie' Cooke 
K5EWJ 




________________________________
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
www.zl4pw.orcon.net.nz

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