Re: KPA-1500 on digital modes

Posted by Larry (K8UT) on Aug 29, 2019; 12:38pm
URL: http://elecraft.85.s1.nabble.com/KPA-1500-on-digital-modes-tp7654828p7654831.html

Pete,

I don't run my amp at full legal limit on digital modes, but typically set the input power for about 1000 watts output. One of the interesting characteristics of the amp is increased efficiency as power increases. At 600 watts efficiency is only 38%, whereas at 1000 efficiency increases to 50% and at 1500 watts to 60%.

(see screenshots)

  -larry (K8UT)

------ Original Message ------
From: "N4ZR" <[hidden email]>
To: "Elecraft List" <[hidden email]>
Sent: 2019-08-29 07:59:23
Subject: [Elecraft] KPA-1500 on digital modes

>Elecraft's published specs rate the KPA-1500 for 1500 watts output on all modes.  In prepping for this weekend's contest, I've been running it at closer to 700 watts, because I've found that even just running on CW, with its much lower duty cycle, my amp reaches 70C quickly.  I don't do that much digital contesting, though, so I'm wondering whether 1500 watts output is on digital modes is realistic or a recipe for trouble.
>
>--
>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:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html
>Message delivered to [hidden email]

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]