[Elecraft] Low Power Output on 160 and 6 meters

[Jim - N4ST]

I see the same output powers on my K3S.
Key down voltage is 13.4 volts on the VFO B display at maximum power out.
Elecraft offered to upgrade my PA chain for $100, but I'm not concerned
about ~1dB and is within spec for 6m anyway.
Glad that diode is in there.  I tested its function once.

_________ 
73,
Jim - N4ST


-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Don Wilhelm
Sent: Tuesday, June 25, 2019 08:31
To: EVERETT SHARP <everettsharp at aol.com>; elecraft at mailman.qth.net
Subject: Re: [Elecraft] Low Power Output on 160 and 6 meters

Everett,

What is your power supply voltage during transmit at 100 watts as measured
with the Alternate VFO B display?

With a solid 13.8 volt power supply voltage, you should see no lower than
12.7 volts (there is a diode drop inside the K3).

If lower, check the connections in the power cable for tightness.
The K3 power cable should run direct from the power supply.  Rigrunner and
other DC power distribution boxes can be reason for excessive voltage drop.

You can increase the power supply voltage up to above 14 volts to help - do
not exceed 15 volts.

73,
Don W3FPR

On 6/24/2019 6:51 PM, EVERETT SHARP via Elecraft wrote:
> I have three K3S and over the week-end I connected each of them to my Bird
watt meter, with a Dummy load. Each of K3S were updated to the current
Firmware and each had the 5 and 50 watt calibrations run.
> 
> What I found was all 3 showed from 80 to 90 watts output on 160 meters 
> and on 6  meters I saw 75 to 90 watts. All other bands showed 
> typically
> 105 to 110 watts. However, one of the K3S showed exactly 100 watts on all
bands except for the lower power on 160 and 6 meters.
> 
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