OK Good to know. I could not get all the way through a single radiogram on Olivia 1000/32 with an average transmit time of 2.5 minutes without it shutting down a hair after 2 minutes in. I just installed all the SideKick panels and Fred's heatsink on my newest KX3 and will retry tonight.
Is there a reason why you chose 50mhz instead of 28mhz for the IF? The KX3 is very inefficient on 6M it seems. On Sep 16, 2014, at 7:50 AM, Wayne Burdick <[email protected]> wrote: > On 2 meters, heating is divided between the HF power amplifier and the > 2-meter power amplifier. I.F. drive for the 2-meter module is generated by > the HF PA, which must still be biased class AB to ensure low distortion. > While the HF PA is not putting out much power, it is reasonably heavily > biased and will eventually heat up. This should take quite awhile, but it is > not rated for key-down "forever," even in this instance. > > 73, > Wayne > N6KR > > On Sep 16, 2014, at 12:15 AM, Chris Johnson <[email protected]> wrote: > >> I participated in a local ARES net with my KX3/2M combo and a mirage B-310-G >> and B-34-G amps. We were using Olivia 1000/32 using 2M verticals to pass >> traffic around the valley and Tucson testing various power levels. >> >> Long story short, these mirage amps work well but the 310 consumes 9 amps >> even when driven with .3 watts in / 30w out from the KX3-2M, and the B-34 >> uses a more field-use reasonable 3.9 amps when driven with 3 Watts In/ 20 >> watts out from the KX3. The net current usage is more optimal with the KX3 >> + B34G, but using this combination the KX3 over heats and shuts off. >> Here's where my confusion comes in. >> >> The back of the KX3 where the primary FETs are were hot. I was under the >> impression that the KX3 used a 50Mhz IF to drive the 2M module and the 2M >> FET on the side would be where the heat is generated, ultimately being the >> part that would overheat if driven too long. But it seemed that the rear >> FETs were where the max heat was generated, ultimately resulting in a self >> protection shutdown. Can I get some clarification on why this happened and >> what the drive level of the IF is? >> >> I have a heat sink to install but have not done it yet. I have two KX3's, >> and will likely make one my digital high-duty cycle KX3 if this is >> unavoidable at even 3W. I have a 2M module in both KX3s. >> >> https://www.flickr.com/photos/ozy311/15255424125/sizes/h/ >> >> Thank you ahead of time! >> >> Chris >> K6OZY >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
