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K3S 6M Tune Pwr

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Bob McGraw - K4TAX

K3S 6M Tune Pwr

I've seen consistently that the 6M TUNE power on my K3S, s/n 10163
defaults to 16 watts.   I have set the TUNE power at 20 watts and it
performs correctly on all bands except 6M.   I've completed the TX Power
Calibration with the K3 Utility. All looks good there.    I have PWR
Per Band set such that the KPA500 is driven correctly from the K3S. The
TUN PWR value as set in the CONFIG menu is 020 for 6M.   But when TUNE
is pressed the VFO B display is 16 watts and the measured output is 16
watts.   On other bands, when TUNE is pressed the VFO B display is 20
watts and the measured power is 20 watts +/- 1 watt.    Also when the
PWR is set to 100 watts, the 6M measured output power is 100 watts +/-
10%    This is measured using a known good 50 ohm dummy load and two
different power meters to confirm the results.

MCU is 5.66, FPF 1.26, DSP1 is 2.88.    I think these are current.

Not a big deal in any way but just curious as to why?

Any ideas?

73

Bob, K4TAX

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Mike Cox

Re: K3S 6M Tune Pwr

Both of my K3S's do exactly the same thing here. Both are running F/W
5.66. I reverted one to a previous F/W (version 5.64) and the same
symptoms persisted. I did not measure the actual output with an external
Wattmeter; these are the values as reported by the K3 itself.

It's not a big deal for me but it certainly seems curious.

Mike, AB9V

On 2/2/2019 12:49 PM, Bob McGraw K4TAX wrote:

> I've seen consistently that the 6M TUNE power on my K3S, s/n 10163
> defaults to 16 watts.   I have set the TUNE power at 20 watts and it
> performs correctly on all bands except 6M.   I've completed the TX
> Power Calibration with the K3 Utility. All looks good there.    I
> have PWR Per Band set such that the KPA500 is driven correctly from
> the K3S. The TUN PWR value as set in the CONFIG menu is 020 for 6M.
> But when TUNE is pressed the VFO B display is 16 watts and the
> measured output is 16 watts.   On other bands, when TUNE is pressed
> the VFO B display is 20 watts and the measured power is 20 watts +/- 1
> watt.    Also when the PWR is set to 100 watts, the 6M measured
> output power is 100 watts +/- 10%    This is measured using a known
> good 50 ohm dummy load and two different power meters to confirm the
> results.
>
> MCU is 5.66, FPF 1.26, DSP1 is 2.88.    I think these are current.
>
> Not a big deal in any way but just curious as to why?
>
> Any ideas?
>
> 73
>
> Bob, K4TAX
>
>
> ______________________________________________________________
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Elecraft mailing list

Re: K3S 6M Tune Pwr

Been the situation for a long time. K3 #00345. Never bothered to query
it. As you say, no big deal.

Regards,

Mike VP8NO

On 02/02/2019 15:20, Mike Cox wrote:
> Both of my K3S's do exactly the same thing here. Both are running F/W
> 5.66. I reverted one to a previous F/W (version 5.64) and the same
> symptoms persisted. I did not measure the actual output with an external
> Wattmeter; these are the values as reported by the K3 itself.
>
> It's not a big deal for me but it certainly seems curious.
>
> Mike, AB9V
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Bob McGraw - K4TAX

Re: K3S 6M Tune Pwr

Thanks guys for the verification on your radios.

I've tried it with TUNE power at different values, 5W, 10W, 20W, &
30W.   In all cases, the value for other bands is as selected, except
for 6M where it is always 70% of the selected TUNE power.   With this, I
figure it is a firmware issue.

Still ....... no big deal.   Just curious.

73

Bob, K4TAX

On 2/2/2019 1:37 PM, Mike Harris via Elecraft wrote:

> Been the situation for a long time. K3 #00345. Never bothered to query
> it. As you say, no big deal.
>
> Regards,
>
> Mike VP8NO
>
> On 02/02/2019 15:20, Mike Cox wrote:
>> Both of my K3S's do exactly the same thing here. Both are running F/W
>> 5.66. I reverted one to a previous F/W (version 5.64) and the same
>> symptoms persisted. I did not measure the actual output with an
>> external Wattmeter; these are the values as reported by the K3 itself.
>>
>> It's not a big deal for me but it certainly seems curious.
>>
>> Mike, AB9V
> ______________________________________________________________
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>

Nr4c

Re: K3S 6M Tune Pwr

I believe the specs indicate that output power on six-meters is less than other bands. Maybe ten is also down, not sure.

Sent from my iPhone
...nr4c. bill

> On Feb 2, 2019, at 3:30 PM, Bob McGraw K4TAX <[hidden email]> wrote:
>
> Thanks guys for the verification on your radios.
>
> I've tried it with TUNE power at different values, 5W, 10W, 20W, & 30W. In all cases, the value for other bands is as selected, except for 6M where it is always 70% of the selected TUNE power. With this, I figure it is a firmware issue.
>
> Still ....... no big deal. Just curious.
>
> 73
>
> Bob, K4TAX
>
>
>> On 2/2/2019 1:37 PM, Mike Harris via Elecraft wrote:
>> Been the situation for a long time. K3 #00345. Never bothered to query it. As you say, no big deal.
>>
>> Regards,
>>
>> Mike VP8NO
>>
>>> On 02/02/2019 15:20, Mike Cox wrote:
>>> Both of my K3S's do exactly the same thing here. Both are running F/W 5.66. I reverted one to a previous F/W (version 5.64) and the same symptoms persisted. I did not measure the actual output with an external Wattmeter; these are the values as reported by the K3 itself.
>>>
>>> It's not a big deal for me but it certainly seems curious.
>>>
>>> Mike, AB9V
>> ______________________________________________________________
>> Elecraft mailing list
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>> This list hosted by: http://www.qsl.net
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>> Message delivered to [hidden email]
>>
>
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