1. You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
    Dismiss Notice

Cooler KX Plus Heatsink for Elecraft KX3 Installation Video

Discussion in 'Ham Equipment' started by Moleculo, Jan 6, 2015.

  1. Moleculo

    Moleculo Administrator
    Staff Member

    Apr 14, 2002
    Likes Received:
    VE7FMN, Fred sent me a Cooler KX Plus heatsink to try out for my Elecraft KX3, and I made a video of the simple install process. This heatsink really is made quite well; the finish and machining compliment the KX3 nicely. Here is the video of the installation procedure, plus a test at the end:

    For a simple test, I ran the KX3 on 20 meters at 10 watts, FM mode into a dummy load until the rig gave a Hi Temp warning and folded the power back to 5 watts. With the stock heatsink, the Hi-Temp warning occurred after 8 minutes and 46 seconds. With the Cooler KX Plus, the keydown time extended to 27 minutes, 36 seconds until the warning. The starting PA temperature for both tests was 28 deg. Celsius and the rig folds the power back at just over 60 degrees.

    It should be noted that the the higher you go in frequency with the KX3, the quicker it heats up. Adding an aftermarket heatsink allows you to operate at full power using high duty cycle modes, such as FM or many digital modes. There are several aftermarket heatsinks available; an independent performance review of each can be found here: http://www.ve7fmn.ca/this-is-cool/pdfs/performance_page/head-to-head.pdf.

    The Cooler KX Plus black heatsink is currently $118; the smaller Cooler KX Lite is $85 and can be ordered direct at http://www.ve7fmn.ca/


Share This Page

  • About Us

    The WorldwideDX Radio Forum was originally established in 2001. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. We are working every day to make sure our community is the best Radio Hobbyist's site.
  • Like us on Facebook

  • Premium VIP Member

    The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Care to buy us a beer? We'd really appreciate it!

    Donate to us!