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K3 tx power issue

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DD7ZT

K3 tx power issue

Hello group,

a friend of mine has a strange problem with his tx power after upgrading
to firmware 3.03. However I couldn't reproduce it with my K3 (also 3.03)
so I'm asking here.

Following test: QRG 3,67 MHz LSB, no ATU, SWR 1:1,2 whistle to the
microphone (Heil) TX pwr max about 80 W

Tap xmit, pwr=120 W, again whistle to the mic, now also 120 W. Now it is
ok until you change the band or power off/on the TRX. Then is starts
again with 80 W. About the same with USB. Also the same with ATU.

Without PA he has 8 W when whistle, then xmit=12 W, now also 12 W when
whistle.

ALC about 4-7 bars. A calibration with the utility didn't solved the issue.

Any ideas?

Many thanks in advance!

Frank, DD7ZT (for my friend Dennis, DG6HD)

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Mike Harris-9

Re: K3 tx power issue

G'day,

looks like the maximum available power setting for SSB really does need
cropping to 100W in firmware.

Regards,

Mike VP8NO

| Tap xmit, pwr=120 W, again whistle to the mic, now also 120 W. Now it is
| ok until you change the band or power off/on the TRX. Then is starts
| again with 80 W. About the same with USB. Also the same with ATU.

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Joe Subich, W4TV-4

Re: K3 tx power issue

In reply to this post by DD7ZT

Check TXG VCE - what is the setting?

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Frank Lammel
> Sent: Thursday, March 19, 2009 10:15 AM
> To: [hidden email]
> Subject: [Elecraft] K3 tx power issue
>
>
> Hello group,
>
> a friend of mine has a strange problem with his tx power
> after upgrading
> to firmware 3.03. However I couldn't reproduce it with my K3
> (also 3.03)
> so I'm asking here.
>
> Following test: QRG 3,67 MHz LSB, no ATU, SWR 1:1,2 whistle to the
> microphone (Heil) TX pwr max about 80 W
>
> Tap xmit, pwr=120 W, again whistle to the mic, now also 120
> W. Now it is
> ok until you change the band or power off/on the TRX. Then is starts
> again with 80 W. About the same with USB. Also the same with ATU.
>
> Without PA he has 8 W when whistle, then xmit=12 W, now also
> 12 W when
> whistle.
>
> ALC about 4-7 bars. A calibration with the utility didn't
> solved the issue.
>
> Any ideas?
>
> Many thanks in advance!
>
> Frank, DD7ZT (for my friend Dennis, DG6HD)
>
>
>
> ______________________________________________________________
> 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

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WILLIS COOKE

Re: K3 tx power issue

In reply to this post by DD7ZT

I have read on this forum that the startup as shutdown settings are not saved unless you power down with the POWER button. The K3 reverts to previous settings if shut down by powering down with the power supply.

I have not experimented with this, but could this be the problem?

Like a previous commenter, I don't think it a wise practice to operate at 120 watts because the purity specs are not guaranteed above 100 watts.

Willis 'Cookie' Cooke
K5EWJ

--- On Thu, 3/19/09, Frank Lammel <[hidden email]> wrote:

> From: Frank Lammel <[hidden email]>
> Subject: [Elecraft] K3 tx power issue
> To: "[hidden email]" <[hidden email]>
> Date: Thursday, March 19, 2009, 7:15 AM
> Hello group,
>
> a friend of mine has a strange problem with his tx power
> after upgrading
> to firmware 3.03. However I couldn't reproduce it with
> my K3 (also 3.03)
> so I'm asking here.
>
> Following test: QRG 3,67 MHz LSB, no ATU, SWR 1:1,2 whistle
> to the
> microphone (Heil) TX pwr max about 80 W
>
> Tap xmit, pwr=120 W, again whistle to the mic, now also 120
> W. Now it is
> ok until you change the band or power off/on the TRX. Then
> is starts
> again with 80 W. About the same with USB. Also the same
> with ATU.
>
> Without PA he has 8 W when whistle, then xmit=12 W, now
> also 12 W when
> whistle.
>
> ALC about 4-7 bars. A calibration with the utility
> didn't solved the issue.
>
> Any ideas?
>
> Many thanks in advance!
>
> Frank, DD7ZT (for my friend Dennis, DG6HD)
>
>
>
> ______________________________________________________________
> 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