K2 Odd Power issues

[Dan Barker]

I was tweaking up my Band Pass filters the other day, and noticed something
weird. If you advance the Power Requested knob fully clockwise, it reads
15.2 watts on all bands except 12 meters. For 24 megacyccles per second, it
shows 10.0 watts.

The K2 (#2456 + A:B, etc.) produces over 10 watts (but not 15.2!) everywhere
below 24kkcps, but this behavior of the POUT display has me baffled. Since I
always run 5 watts anyhow, I don't see any operational issue, but I sure am
curious. Also, power seems a bit low on 10 (and maybe 12) meters, and
current a bit high on 160 - I'd not noticed due to the above mentioned
self-imposed 5 watt limit.

Any ideas out there?

Dan / WG4S / K2 #2456

Raw data (Power from the KAT2 in CALP mode, Heathkit Cantenna). Power: Car
battery on 16 guage wire (My bench supply peaks at 3A).

kkcps   Pout (max CW)
 1.8    9.9   (High-current annunciator, CAL Cur at 4.0)
 3.5   13.9
 7.0   13.5
10.1   12.9
14.0   13.8
18.1   14.1
21.0   11.4
24.9    9.6   (Software limited or hardware? Hummmm.....)
28.0    5.8

_______________________________________________
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

[Dan Barker]

I'm aware of that setting, but the symptom is on 24 only, not on 28. Very odd. Also, I didn't remember that it was for 12 also.

So, I set the Po28 to 15. Now both 24 and 28 show 15.2 as max requested. I set it back to 10. Still both 24 and 28 show 15.2 as max requested. I'm guessing the firmware got lost, at some point, and toggling Po28 fixed it. Now the display is believable, and I've got a couple transformers to inspect for the low power out on the higher bands.

Very interesting result.

Dan



k4zm sez:
<snip>
In your Secondard Menu of the firmware there is a setting called "Po28"  it comes defaulted to 10 watts and this controls the maximum output on 12 and 10 meters.
</snip>




________________________________________________________________
Sent via the WebMail system at visioncomm.net


 
                   
_______________________________________________
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

[Tom Hammond-3]

Dan:

Depends upon which MODE you're in when you set power.

Po28 only is active in modes other than CW.

73,

Tom   N0SS

At 07:23 AM 12/20/04, Dan Barker wrote:

>I'm aware of that setting, but the symptom is on 24 only, not on 28. Very
>odd. Also, I didn't remember that it was for 12 also.
>
>So, I set the Po28 to 15. Now both 24 and 28 show 15.2 as max requested. I
>set it back to 10. Still both 24 and 28 show 15.2 as max requested. I'm
>guessing the firmware got lost, at some point, and toggling Po28 fixed it.
>Now the display is believable, and I've got a couple transformers to
>inspect for the low power out on the higher bands.
>
>Very interesting result.
>
>Dan
>
>
>
>k4zm sez:
><snip>
>In your Secondard Menu of the firmware there is a setting called
>"Po28"  it comes defaulted to 10 watts and this controls the maximum
>output on 12 and 10 meters.
></snip>
>
>
>
>
>________________________________________________________________
>Sent via the WebMail system at visioncomm.net
>
>
>
>
>_______________________________________________
>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

_______________________________________________
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