Re: [Elecraft] (K3) Low output power on 15 meters (new KYSN related ?)

[Ken K3IU]

I have the same thing here, Bruce. Something in firmware was 
changed a while ago and when I reported it to Wayne, he said 
that it is within specs.

73, Ken K3IU
~~~
On 1/9/2016 11:09 AM, Bruce Meier wrote:

Today I noticed that the output power on 15 meters does not reach 100w.  The
max, according to the front panel meter reading, is 93w.  So, I ran the
transmitter gain calibration and it did not help. I decreased the power to
90w and it reached 90w, so I gradually increased the power and it is fine up
to 93w.  When set to 94w and above the max output is 93w.  I checked all
other bands and with the exception of 17 meters they are fine. The same low
power output occurs on 17 meters.

I then tried my other K3 going through the exact same testing order and
received the exact same results. They are both the exact same configuration.

Specifics:

- testing into both a dummy load (2 different ones) and 3 different 15 meter
antennas
- both K3 rigs are running latest firmware (5.38 / 2.86 / 2.86 / 1.25)
- The power supply voltage at the rigs is 13.8 and drops to around 13.0 when
in transmit
- Reran the Transmitter Gain Calib - no help.

NOTE: The new KSYN3As were just installed in both rigs including the second
RX (2 weeks ago)

Suggestions?

73,
Bruce-N1LN


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Re: [Elecraft] (K3) Low output power on 15 meters (new KYSN related ?)

[Wayne Burdick]

This has nothing to do with the new synth. We're hoping to have another 
firmware release dealing with it soon. I've been working on other issues.

73,
Wayne
N6KR



On Jan 9, 2016, at 8:09 AM, "Bruce Meier"  wrote:

> Today I noticed that the output power on 15 meters does not reach 100w….


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Re: [Elecraft] (K3) Low output power on 15 meters (new KYSN related ?)

[Vic Rosenthal]

I noted a similar issue and found that increasing the power supply voltage a 
bit returned full output. I think I have about 14.2v at the rig in receive 
mode. This was before I updated the synths so I don't think it's related to 
that.

Vic 4X6GP/K2VCO

> On 9 Jan 2016, at 6:09 PM, Bruce Meier  wrote:
> 
> Today I noticed that the output power on 15 meters does not reach 100w.  The
> max, according to the front panel meter reading, is 93w.  So, I ran the
> transmitter gain calibration and it did not help. I decreased the power to
> 90w and it reached 90w, so I gradually increased the power and it is fine up
> to 93w.  When set to 94w and above the max output is 93w.  I checked all
> other bands and with the exception of 17 meters they are fine. The same low
> power output occurs on 17 meters.
> 
> I then tried my other K3 going through the exact same testing order and
> received the exact same results. They are both the exact same configuration.
> 
> Specifics:
> 
> - testing into both a dummy load (2 different ones) and 3 different 15 meter
> antennas
> - both K3 rigs are running latest firmware (5.38 / 2.86 / 2.86 / 1.25)
> - The power supply voltage at the rigs is 13.8 and drops to around 13.0 when
> in transmit
> - Reran the Transmitter Gain Calib - no help.
> 
> NOTE: The new KSYN3As were just installed in both rigs including the second
> RX (2 weeks ago)
> 
> Suggestions?
> 
> 73,
> Bruce-N1LN
> 
> 
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Re: [Elecraft] (K3) Low output power on 15 meters (new KYSN related ?)

[Bob McGraw K4TAX]

I suppose "spec" would be about 1 dB or so.   If so, then somewhere 
between 80 and 125 watts would be about right for a nominal 100 watt 
radio.  I, however, didn't see and published spec for transmitter power 
in my K3S manual.


73
Bob, K4TAX

On 1/9/2016 10:27 AM, Ken K3IU wrote:
I have the same thing here, Bruce. Something in firmware was changed a 
while ago and when I reported it to Wayne, he said that it is within specs



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[Elecraft] (K3) Low output power on 15 meters (new KYSN related ?)

[Bruce Meier]

Today I noticed that the output power on 15 meters does not reach 100w.  The
max, according to the front panel meter reading, is 93w.  So, I ran the
transmitter gain calibration and it did not help. I decreased the power to
90w and it reached 90w, so I gradually increased the power and it is fine up
to 93w.  When set to 94w and above the max output is 93w.  I checked all
other bands and with the exception of 17 meters they are fine. The same low
power output occurs on 17 meters.

I then tried my other K3 going through the exact same testing order and
received the exact same results. They are both the exact same configuration.

Specifics:

- testing into both a dummy load (2 different ones) and 3 different 15 meter
antennas
- both K3 rigs are running latest firmware (5.38 / 2.86 / 2.86 / 1.25)
- The power supply voltage at the rigs is 13.8 and drops to around 13.0 when
in transmit
- Reran the Transmitter Gain Calib - no help.

NOTE: The new KSYN3As were just installed in both rigs including the second
RX (2 weeks ago)

Suggestions?

73,
Bruce-N1LN


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