K3-100 Low Power Output

[Greg Leber]

Just to be more clear. The AL1200 takes a full 100W to drive. That's how I
found out I had a problem.
When I did the transmitter gain calibration I ren directly from the rig
thru my LP-100A watt meter then to the dummy load. I tried changing out the
coax and the swr was at 1.05 or less at all times. I had the tuner bypassed
and I calibrated at 5w and 50w like the manual says to do using the K3
utility. I have done this a number of times and have the same results. I
can only get 100w out on 12 and 30m.

Greg (K9ON)
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[Mike Reublin]

Does the calibration succeed or fail?

Antenna selection is on a per band basis. Maybe you have the wrong antenna selected?

73, Mike NF4L

On May 8, 2014, at 11:07 PM, Greg Leber <[hidden email]> wrote:

> Just to be more clear. The AL1200 takes a full 100W to drive. That's how I
> found out I had a problem.
> When I did the transmitter gain calibration I ren directly from the rig
> thru my LP-100A watt meter then to the dummy load. I tried changing out the
> coax and the swr was at 1.05 or less at all times. I had the tuner bypassed
> and I calibrated at 5w and 50w like the manual says to do using the K3
> utility. I have done this a number of times and have the same results. I
> can only get 100w out on 12 and 30m.
>
> Greg (K9ON)
> ______________________________________________________________
> 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
> Message delivered to [hidden email]

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[Don Wilhelm-4]

Greg,

What is the voltage from your power supply during an attempt to achieve
100 watts output.  It should be 12 volts or greater.  Check with the the
voltmeter at the K3 end rather than the power supply. The K3 will
display the voltage in the VFO B area.

If the voltage is the problem, check your power supply and its cabling.  
Make certain all connections are tight and low resistance.

73,
Don W3FPR

On 5/8/2014 11:07 PM, Greg Leber wrote:
> Just to be more clear. The AL1200 takes a full 100W to drive. That's how I
> found out I had a problem.
> When I did the transmitter gain calibration I ren directly from the rig
> thru my LP-100A watt meter then to the dummy load. I tried changing out the
> coax and the swr was at 1.05 or less at all times. I had the tuner bypassed
> and I calibrated at 5w and 50w like the manual says to do using the K3
> utility. I have done this a number of times and have the same results. I
> can only get 100w out on 12 and 30m.
>

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[Jim Brown-10]

On 5/8/2014 8:34 PM, Don Wilhelm wrote:
> Check with the the voltmeter at the K3 end rather than the power
> supply. The K3 will display the voltage in the VFO B area.

Yes. Solid state power amps work better with higher supply voltage. If
you have not already don so, try to find a PSU that can regulate to 13.8
VDC at the current you need. BTW -- a high supply voltage also reduces
distortion (IM, splatter, clicks).

73, Jim K9YC
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