[Elecraft] K2/100 SSB ALC Problem(Revised)

[Ron D'Eau Claire]

Egad. Made the same test and it acts that way on 7 MHz for me too (as well
as 60 meters) on ol' S/N1289 with Rev 2.04/1.09 firmware. The other bands
seem okay. 

I'm not a SSB operator either so I never noticed it. 

Ron AC7AC

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ken K3IU
Sent: Monday, July 31, 2006 10:17 AM
To: 'Don'; 'List Elecraft'
Subject: RE: [Elecraft] K2/100 SSB ALC Problem(Revised)


Very interesting. I also seldom use SSB, but I did a test on 5413 and see
the same thing. I have the K2/100 connected to a 50 ohm DL through a Diamond
SX-200 power meter. When I first turn the K2/100 "on" with the power control
set to 15-20 watts, mode LSB and "ahhhhhh" into the mic, I get 100 Watts PEP
out. If I then switch to ALC on the display, and do the same "ahhhhh", the
power is pulled down to the 15-20 watts output. Switching back to RF display
produces the same 15-20 watts PEP output. Turning power OFF and then ON
without changing the RF/ALC display results in full power out. I also note
that if the power control is turned up to 100 watts and then back down to 20
the ALD then brings the power down to 20 watts, or so, without having to
change to ALC display.

So I am seeing 2 things that "fix" the anomaly... 1)Switching to ALC display
and 2) Adjusting the power control

Wonder if there is anyone else out there who sees this ????

73, Ken K3IU

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don
Sent: Monday, July 31, 2006 12:30 PM
To: List Elecraft
Subject: [Elecraft] K2/100 SSB ALC Problem(Revised)

I just discovered that the behavior described below only occurs at turn-on. 
Changing to ALC display causes results in normal control of power level as
described but if I then switch back to RF display then power control
*remains* normal.  Only when I turn the rig off and back on again does the
power go out of control.

Don K7FJ
-------------------

>I almost never use SSB mode so have a lot still to discover about my K2
>in ssb mode.
>
> I was on 40 meters ssb last night at 20 watts or so and found that the
> rig kept rebooting.  It was caused by an output that was actually well 
> over 100 watts.
>
> Later, connected to a dummy load and monitoring output with a scope
> across the load I found that.
>
>    1  The rig always turns on with the metering set to RF mode ...
> just as the manual says.
>
>    2  With the metering in RF mode the power is not controlled at all.
> No matter where the power level is set (11 to 100 watts with the KPA100
> engaged) the output peaks at over 100 watts.   When I switch the bar 
> display to ALC the output is controlled as I would expect ... at 
> whatever the power has been set to.
>
>    3  CW mode is normal.
>
>
> I had thought that ALC would be active and in control even when the
> metering is set to display power instead of ALC level but that does 
> not seem to be the case.
>
> I'm using an Icom IC-HM7 mobile mike (amplified).  It seems to have
> about the right amount of output because, at low power settings, the 
> ALC display shows a *lot* of ALC (all bars lit most of the time) but 
> at 100 watts the ALC display barely flickers which indicates that the 
> mic barely has enough output to drive the rig to 100 watts.
>
> Don K7FJ

_______________________________________________
Elecraft mailing list
Post to: Elecraft at mailman.qth.net
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: Elecraft at mailman.qth.net
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