[Elecraft] Strange power problem with KPA1500

[Carl Yaffey]

I hear you. In the case I described, the power NEVER comes up on SSB until I switch to CW and back to USB. Annoying.

> On May 13, 2018, at 4:31 PM, Michael Blake <k9jri at mac.com> wrote:
> 
> Carl, I suspect that the issue you see is not a KPA1500 issue.  The same sequence takes place the first time you use the KPA500 each day.  In fact I have seen the same issue with the K3s by itself with no amplifier.  It takes mine a few words or short sentences to ramp up to whatever the K3s power has been set for.  CW dits will start the process but it seems to take SSB voice to complete it.
> 
> After the power ramps up (a few seconds of ssb modulation) it will stay at that power level until the K#s has been powered down and turned back on.  This is what I see on mine anyway as does another local K3s/KPA500 user.
> 
> It will happen EVERY TIME the k3s is first started for both of us.  I believe we both have the mic and compression settings correctly adjusted but low mic levels or low compression will lengthen the duration of ssb modulation required to stabilize the output power.
> 
> I have seen this described several times on the reflector without having seen any explanation for why it might occur other than the method Elecraft uses for power control.
> 
> Michael Blake
> k9jri at mac.com <mailto:k9jri at icloud.com>
> 
> 
> 
> 
> 
> 
>> On May 13, 2018, at 4:16 PM, Carl Yaffey <cyaffey at gmail.com <mailto:cyaffey at gmail.com>> wrote:
>> 
>> 1. Select 20m
>> 2. Go to 14.305 and select USB.
>> 3. Press ATU Tune on amp.
>> 4. Press tune on K3S and tune completes.
>> 5. Select OPER on amp.
>> 6. Speak into mic. Only see 100 watts on amp’s meter. Huh???
>> 7. Change mode to CW.
>> 8. Press key.
>> 9. Power starts out at 100 and climbs up to 1300w or so.
>> 10. Switch mode to SSB, speak into mic, and the meter shows proper power.
>> 
>> 
>> Carl Yaffey  K8NU
>> Recording studio.
>> cyaffeyNO_SPAM at gmail.com <mailto:cyaffeyNO_SPAM at gmail.com> 
>> 614 268 6353, Columbus OH
>> http://www.carl-yaffey.com <http://www.carl-yaffey.com/>
>> http://www.grassahol.com
>> http://www.bluesswing.com
>> 
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Carl Yaffey  K8NU
Recording studio.
cyaffeyNO_SPAM at gmail.com 
614 268 6353, Columbus OH
http://www.carl-yaffey.com
http://www.grassahol.com
http://www.bluesswing.com