K3 - Output power instability?

[GW0ETF]

Whilst transmitting today on CW (QSK) at full power, I've noticed on a
couple of occasions the power meter showing a fairly sudden drop in
power to around 45 or so watts. It gradually returns to full power and
then will behave normally for long periods. Each time this has happened
the radio has been on 80m and the ATU has been in circuit; the power
setting remains at 100 watts the whole time and the current meter on the
power supply does suggest that the power is indeed falling. The SWR
indication remains low and the PA temp stays around 37 deg.

If it continues to happen I will make more careful observations but as
an initial step thought I'd see if anyone has experienced this or has
any idea of what may be going on.

73, Stewart Rolfe, GW0ETF (K3 s/n 145)
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[Don Wilhelm-4]

Stewart,

Do you have the latest firmware loaded?  As I recall, there were some
changes to the power controls in the latest release which address that
very problem.  If you have the latest, then try the next release.

73,
Don W3FPR

Stewart Rolfe wrote:

> Whilst transmitting today on CW (QSK) at full power, I've noticed on a
> couple of occasions the power meter showing a fairly sudden drop in
> power to around 45 or so watts. It gradually returns to full power and
> then will behave normally for long periods. Each time this has
> happened the radio has been on 80m and the ATU has been in circuit;
> the power setting remains at 100 watts the whole time and the current
> meter on the power supply does suggest that the power is indeed
> falling. The SWR indication remains low and the PA temp stays around
> 37 deg.
>
> If it continues to happen I will make more careful observations but as
> an initial step thought I'd see if anyone has experienced this or has
> any idea of what may be going on.
>
> 73, Stewart Rolfe, GW0ETF (K3 s/n 145)
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>
>

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