Re: [Elecraft] KX2 heatsink

On 06/19/2017 10:41 AM, Wayne Burdick wrote: > - Running from a lower supply voltage (e.g., the 11 V internal battery) > should reduce power dissipation With external 13.8V input, power lowered to 5W at 3 minutes 48 seconds. With internal battery, at 8 minutes, the PA temperature was 60C.

Re: [Elecraft] KX2 heatsink

On 6/19/2017 16:13, John Oppenheimer wrote: On 06/19/2017 10:41 AM, Wayne Burdick wrote: - Running from a lower supply voltage (e.g., the 11 V internal battery) should reduce power dissipation This is counter to what I had thought! This makes perfect sense. The closer the PA operates to

Re: [Elecraft] KX2 heatsink

On 06/19/2017 10:41 AM, Wayne Burdick wrote: > - Running from a lower supply voltage (e.g., the 11 V internal battery) > should reduce power dissipation This is counter to what I had thought! But: With external 13.8V input, power lowered to 5W at 3 minutes 48 seconds. With internal battery, I

Re: [Elecraft] KX2 heatsink

> John Oppenheimer wrote: > > My KX2 dropped from 10W to 5W at 3 minutes 48 seconds of key down, > starting at 25C. This is fairly typical. I’ve seen some as high as 8 minutes. Some tips related to PA temperature: - Make sure all right-side hardware is tightened - Running

Re: [Elecraft] KX2 heatsink

This change was made very early on in production and is not significant in terms of thermal performance. Wayne N6KR > On Jun 19, 2017, at 8:02 AM, Tim McDonough N9PUZ wrote: > > On 6/18/2017 8:48 PM, Howard Hoyt wrote: > >> The newer Elecraft revision with the silicone

Re: [Elecraft] KX2 heatsink

On 6/18/2017 8:48 PM, Howard Hoyt wrote: The newer Elecraft revision with the silicone electrical isolators and other PA differences will not show quite as good thermal performance as the original design where the PA FETs were mounted directly to the heatsink or right end panel. Does anyone

Re: [Elecraft] KX2 heatsink

o:n...@elecraft.com] Sent: Sunday, June 18, 2017 4:51 PM To: Ron D'Eau Claire Cc: Irma & Linas(LY2H); elecraft@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 --

[Elecraft] KX2 heatsink

Hi Linas, There are many variables which come into play when quantifying the performance of a thermal solution. First off, the PA efficiency is different on different bands, accounting for the differing amount of heat rejected. As we state in the testing data, we do tests based on fully

Re: [Elecraft] KX2 heatsink

Hi Linas, My KX2 dropped from 10W to 5W at 3 minutes 48 seconds of key down, starting at 25C. John KN5L __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post:

Re: [Elecraft] KX2 heatsink

LY2H)'; elecraft@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

Re: [Elecraft] KX2 heatsink

Definitely sounds like a heatsink to source interface issue. Either not a flush enough fit, missing, wrong, or not appropriately applied thermal compound... 73, __ Clay Autery, KY5G On 6/18/2017 5:26 PM, Don Wilhelm wrote: > I would check to be certain the PA transistors

Re: [Elecraft] KX2 heatsink

LY2H)'; elecraft@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.

Re: [Elecraft] KX2 heatsink

craft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Irma & Linas(LY2H) Sent: Sunday, June 18, 2017 2:33 PM To: elecraft@mailman.qth.net Subject: [Elecraft] KX2 heatsink Hello folks, I am looking for the practical , empyrical, real info based on the individual measurements of t

Re: [Elecraft] KX2 heatsink

Linas, I know Howie (owner of Pro Audio Engineering) and consider him to be a personal friend. I also know he is a meticulous engineer, and very likely has full data from his testing. I suggest sending him a direct email request. The results you posted - only 3 minutes keydown at 10 watts

[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

Re: [Elecraft] KX2 Heatsink

I posted quite a few messages to the KX3 group on Yahoo. Some of them over a year ago were lost. I asked Howie and he responded that he deleted nothing. It seems that past May of last year, none of my posts made. My messages to other groups on yahoo make it, the last one yesterday. Not sure what

Re: [Elecraft] KX2 Heatsink

Leroy, Many of us experienced exactly what you described: banning without notice and no replies from the moderator. I despise that method of running a list and no member has been treated that way since I became moderator of the Yahoo KX3 KX User Group in late May 2015 and I believe all here

Re: [Elecraft] KX2 Heatsink

Thank you Howie! I was also banned from that group in 2014 for reasons that were never clear to me, and I did not get any reply from the owner when I asked what I had done wrong. At the time I was extremely upset as I had never been banned from anything before in my life. I did hear some very

Re: [Elecraft] KX2 Heatsink

I did not know about Tex until today. I based my opinion on my own experience. The last time I emailed moderator and got no response I deleted KX3 from the groups I belong to. So I am not a problem to you have to deal with. After today I doubt others will have a problem, so I think you

Re: [Elecraft] KX2 Heatsink

How did you become moderator after being banned. The moderator would not even acknowledge anyone's emails. Seems as though the moderator had no name or call sign posted. Guess you had an inside track. I sent an email to you at Pro Audio after selling my KX3 and acquiring a KX2. You were the

Re: [Elecraft] KX2 Heatsink

: Eric Swartz - WA6HHQ, Elecraft Sent: Monday, May 15, 2017 3:59 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KX2 Heatsink Folks - I've just corresponded with Howard Hoyt, W4SPC, of Pro-Audio Systems. It appears you may be mistaken about the assertion Howard was the moderator banning

Re: [Elecraft] KX2 Heatsink

Folks - I've just corresponded with Howard Hoyt, W4SPC, of Pro-Audio Systems. It appears you may be mistaken about the assertion Howard was the moderator banning people from the independent Yahoo KX3 list. Howard took over the Yahoo KX3/KX2 list a while back from its original owner, who

[Elecraft] KX2 Heatsink

Leroy, everyone else reading the misinformation posted by Tex KA5Y: Please do not make a decision on faulty information. I was the one who came along AFTER the original list owner who banned many people including me, and I fixed the idiotic policies which kept people from talking about

Re: [Elecraft] KX2 Heatsink

Folks, Lets close the 'list banning' portion of this thread. Regardless of your motivation, it is a violation of the Elecraft list guidelines to criticize other people or vendors in this manner. eHam and other forums have review sections where info like this can be passed on. That said, I'll

Re: [Elecraft] KX2 Heatsink

@mailman.qth.net Subject: [Elecraft] KX2 Heatsink Yes, I was also one of those being banned from KX3 yahoo group because I mentioned competitive products. Any way no regret on my part and I will adhere to this official mailing listing. 73 Johnny VR2XMC 寄件人︰ pkhjr via Elecraft <elecr

[Elecraft] KX2 Heatsink

t 傳送日期︰ 2017年05月15日 (週一) 8:54 PM 主題︰ Re: [Elecraft] KX2 Heatsink For those of you who don't Howard Hoyt  aka Howie - WA4PSC is the moderator for the KX3/KX2 Yahoo group and is the owner of Pro Audio Engineering which markets products for Elecraft KX products. Several years ago when hea

Re: [Elecraft] KX2 Heatsink

For those of you who don't Howard Hoyt aka Howie - WA4PSC is the moderator for the KX3/KX2 Yahoo group and is the owner of Pro Audio Engineering which markets products for Elecraft KX products. Several years ago when heatsinks for the KX3 were just becoming an item I made the greviouis mistake

[Elecraft] KX2 Heatsink

t 傳送日期︰ 2017年05月15日 (週一) 5:19 AM 主題︰ [Elecraft] KX2 Heatsink Hi Kev, The issue is related to the fact that Elecraft, as do virtually all amateur radio manufacturers rate power output with 50% duty cycle SSB/CW modes only.  As is stated in the KX3 specifications and here copied from t

Re: [Elecraft] KX2 Heatsink

Sorry if this is argumentative, but your post seems to be in conflict with Wayne's post earlier today. Wayne: "...heat sinking that is entirely adequate in all modes at full power, even from a 14 volt external supply." The manual also says "all modes" which I don't see why that would

[Elecraft] KX2 Heatsink

Hi Kev, The issue is related to the fact that Elecraft, as do virtually all amateur radio manufacturers rate power output with 50% duty cycle SSB/CW modes only. As is stated in the KX3 specifications and here copied from the KX2 manual: /"80-17 meters, 10 W PEP max (+/- 1 dB); 12 and 10

Re: [Elecraft] KX2 Heatsink [which is entirely sufficient for typical operation]

I like the way the way the VE7FMN heat sink I bought for my KX3 looks. Now that the PAs are on the side of the KX2, I just don't feel the same about the appearance of the heat sinks I've seen for it. Kind of look lopsided. -Kevin (KK4YEL) - The problem with the world is that the

Re: [Elecraft] KX2 Heatsink [which is entirely sufficient for typical operation]

Thanks Wayne. I bought the heat sink for the KX3 and found it wasn't needed for the way I operate. Seems the same for the KX2. Normal conditions don't require additional heatsinking. Extreme conditions might. 73, Kev K4VD On Sun, May 14, 2017 at 12:55 PM, Wayne Burdick wrote:

Re: [Elecraft] KX2 Heatsink [which is entirely sufficient for typical operation]

Hi Kevin, We have shipped many thousands of KX2s, and in all that time I have seen only a few comments asking about additional heat sinking. The KX2’s thick right side panel is thermally integrated with both the top and bottom cover. This results in heat sinking that is entirely adequate in

Re: [Elecraft] KX2 Heatsink

I had thermal warnings on my KX3 with WSPR at 0.1 watt. 60% duty cycle, however. On Sun, May 14, 2017 at 12:19 PM Walter Underwood wrote: > First, read the specifications. They are on page 54 of the latest KX3 > manual. > > " 5 W or less recommended for high-duty-cycle

Re: [Elecraft] KX2 Heatsink

First, read the specifications. They are on page 54 of the latest KX3 manual. " 5 W or less recommended for high-duty-cycle modes (FM, AM, DATA). Power will automatically be reduced if PA temperature or current limits are exceeded.” A larger heatsink was introduced a couple of years ago. The

[Elecraft] KX2 Heatsink

>From a recent post: "We have been told by people running the rig in digital modes at 10W the unit will thermal down after a few transmit cycles" I understand the KX3 also had an early issue with heatsinks that was corrected in time by the company making the aftermarket heatsink unnecessary I