[Elecraft] KPA-1500: Widely varying drive requirement - same frequency, different antenna

[Eric Swartz WA6HHQ - Elecraft]

This is not unusual when the loads presented by the antennas (or tuner)  to the amp are different.  This can even be true when the SWRs are identical if the actual +/- reactance of one is different than the other. 

This is most noticeable on lower freq bands where the amps gain is typically higher. 

Eric
elecraft.com
---
Sent from my iPhone 6S

> On Oct 23, 2019, at 5:00 AM, N4ZR <n4zr at comcast.net> wrote:
> 
> I have two 40M antennas, a Carolina Windom and a full-wave parasitic sloper.  I have just noticed that on any given frequency, my K3 must deliver considerably more power on one than the other, in order for the amp to produce 1500 watts.  The difference is 27 watts on one vs 42 watts on the other.  Is this normal?
> 
> -- 
> 
> 73, Pete N4ZR
> Check out the Reverse Beacon Network
> at <http://reversebeacon.net>, now
> spotting RTTY activity worldwide.
> For spots, please use your favorite
> "retail" DX cluster.
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to eric.swartz at elecraft.com