[Elecraft] KX2 heatsink

[Ron D'Eau Claire]

Yes. I was busy cooking dinner and was glancing at the power displayed on an
external meter from time to time. 

I've not seen the power shut down on me, but then I'm seldom running QRO
(>10 watts) with any rig. 

73, Ron AC7AC

-----Original Message-----
From: Wayne Burdick [mailto:n6kr at elecraft.com] 
Sent: Sunday, June 18, 2017 4:51 PM
To: Ron D'Eau Claire
Cc: Irma & Linas(LY2H); elecraft at mailman.qth.net
Subject: Re: [Elecraft] KX2 heatsink

Auto power reduction happens at 63 C. But it may very well have gone down to
55 C awhile after dropping to 5 W. 

Wayne
N6KR

----
http://www.elecraft.com

> On Jun 18, 2017, at 4:38 PM, Ron D'Eau Claire <ron at cobi.biz> wrote:
> 
> Sri, I meant the temp was 55C, not 45C after the automatic power 
> reduction kicked in.
> 
> 73 Ron AC7AC
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ron D'Eau 
> Claire
> Sent: Sunday, June 18, 2017 4:28 PM
> To: 'Irma & Linas(LY2H)'; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] KX2 heatsink
> 
> Fired up my "stock from the factory" KX2 into a dummy load at 10 
> watts, key down, and it dropped to 5 watts after 4 minutes running 
> from a 13.8 vdc supply.  PA temp was about 45C.
> 
> Hope that helps with your analysis.
> 
> 73, Ron AC7AC
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Irma & 
> Linas(LY2H)
> Sent: Sunday, June 18, 2017 2:33 PM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] KX2 heatsink
> 
> Hello folks,
> I am looking for the practical , empyrical, real info based on the 
> individual measurements of the maximum Key-down time/temperature at 
> the 10w output of the KX2 before it drops down to 5 W issuing a 
> message of "HI TEMP". I would also like to learn about comparison of 
> the KX2 stock heatsink vs the Pro-audio Engineering KX22 product.
> 
> The reason is that I have decided to install the KX22 on my KX2 ( # 
> 148*) after a short dx-pedition to Aland islands in May. I was 
> handling quite a pile-up from the hotel room and after some 5 min of 
> intensive CQ-ing and answering on CW the PA temperature gone up to 
> 59-60C degrees and the power dropped down to 5 W and it was 
> frustrating :) Today I have installed the PAE
> KX22 heatsink. The key-down at 10 W into a dummy load in CW mode 
> lasted for around 3 minutes starting from the ambient temp. 27C. I 
> don't think this is very impressive baring in mind the Pro-audio's  
> claim of the 250% key-down time improvement. Unfortunately, I was not 
> so smart to test the key-down time with the stock heatsink before I 
> changed it to the new one, :) But I remember Wayne was posting  here 
> in the previous thread something abt 7 min of key-down at 10W... So, 
> with the 250% improvement with the KX22 it should last... for some 24 
> min?! in my case, It doesn't sound very realistic , neither 7 min with 
> the stock heatsink, nor 24 min with the Pro-Audio ( maybe ,bad thermal 
> contact, not enough of grease?). That's why it would be very 
> interesting  to compare the real-life empyrical data of the other KX2
owners.
> 
> 73! Linas LY2H
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