Re: [Elecraft] KX3 Heatsink discussion

Hi Jan, Elecraft designed the KX twins to run with maximum efficiency, so up to 10 watts, it is the more efficient PA in the KX3 which supplies the output power with the KXPA100 in bypass, and when more than 10 watts is dialed in the KXPA100 is enabled, and the KX3 throttles back to make the

Re: [Elecraft] KX3 Heatsink discussion

OH ~ I think we all understand that the word "heat-sink" implies that it might/will get warm :-) BUT ~ I originally asked about the "heating" of the KX3 when driving the KXPA100 at 20W SO ~ I experimented this morning with adjusting the power OUT of the KX3 while driving the KXPA100

[Elecraft] KX3 Heatsink discussion

Sorry of this appears twice, I got a bounce on the first submission: The Pro Audio Engineering Kx32 Heatsink has more surface area than any other commercially available KX3 heatsink. Regarding mass, more is not necessarily better. If you take two heatsinks with the same surface area, on the

Re: [Elecraft] KX3 Heatsink discussion

Actually, that’s 63 C at the PA device location on the PC board. The outside surface of the heat sink itself is quite a bit lower in temperature. Wayne N6KR > On Aug 6, 2017, at 11:39 AM, Wayne Burdick wrote: > > The KX3 and KX2 max heat sink temperature is 63 C. At that

Re: [Elecraft] KX3 Heatsink discussion

The KX3 and KX2 max heat sink temperature is 63 C. At that point power is automatically dropped to 5 W. If it reaches the max temp again, transmit is exited. Wayne N6KR > On Aug 6, 2017, at 10:27 AM, Jim Brown wrote: > > A well designed output stage SHOULD be

Re: [Elecraft] KX3 Heatsink discussion

A well designed output stage SHOULD be hot to the touch. The temperature component of protection in Elecraft output stages seems to kick in when the internal temperature approaches 70 deg C. You can see this, for example, by watching temperature in the KPA500 and listening to fan speed. The

[Elecraft] KX3 Heatsink discussion

I'm puzzled by the comment posted yesterday: by Jim W7JR ""I've been doing a lot of FT-8 using my KX3 and my KXPA100 at 20 watts, and have noticed that the KX3 is heating up quite a bit and is almost hot to the touch"" Why should the KX3 be heating up, when the AMP is running only 20W ? Is the

Re: [Elecraft] KX3 heatsink question

n.qth.net] On Behalf Of > Howard > Hoyt > Sent: Tuesday, March 21, 2017 3:11 AM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] KX3 heatsink question > > Hi Rich, > > The advantages of a real aftermarket heatsink (not the poorly designed > imports) is rapi

Re: [Elecraft] KX3 heatsink question

for ProAudio is well worth it. Best regards, Jerry, W1IE -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Howard Hoyt Sent: Tuesday, March 21, 2017 3:11 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] KX3 heatsink question Hi Rich

Re: [Elecraft] KX3 heatsink question

Hi Rich, The advantages of a real aftermarket heatsink (not the poorly designed imports) is rapid thermal recovery after each transmit cycle and less heat re-radiated into the rig. The import with the rounded fin root as well as others have a less optimum volume to surface area ratio and

Re: [Elecraft] KX3 heatsink question

Look at: http://www.kl7uw.com/KX3.htm Prices may have changed. Hopefully links still good. Combination of after-market heat sink and temp compensation procedure. 73, Ed - KL7UW http://www.kl7uw.com Dubus-NA Business mail: dubus...@gmail.com

Re: [Elecraft] KX3 heatsink question

Ed, The KX3 "wrap-under" heatsink is adequate for most modes. However if you are using data modes with long transmit periods at power levels above 7 or 8 watts, you might want to consider an aftermarket heatsink. Give it a try and feel the heatsink after several transmission periods. It

Re: [Elecraft] KX3 heatsink question

I have a KX3 with the new heatsink (S/N 7XXX) and although the heatsink gets warm during ops, I've not had any issues running the high duty cycle modes with the factory model. I am not a heavy duty digital mode user, so YMMV; but I'm avoiding the required surgery that the heatsink would require.

[Elecraft] KX3 heatsink question

With some expert help from the Elecraft forum, I'm up and running JT65/9 using my new KX3. My rig's s/n is 9403, do I still need to consider upgrading to the after-market heatsink or the one that came with my new KX3 (9403) sufficient for most data modes? tnx and 73 k6sdw ed

[Elecraft] KX3 Heatsink issue

Hi all, I have had quite a few inquiries regarding installing our aftermarket Kx31 heatsink in place of the newest Elecraft L shaped heatsink. In deference to Eric and Wayne who graciously offer occasional posts in this list to vendors, I'll not discuss it here. Please see our FAQ on this

Re: [Elecraft] KX3 heatsink

Hi, This was over on the KX3 Yahoo group http://www.bigskyspaces.com/w7gj/KX3HeatSinks.htm Calvin KA7MAY On Nov 19, 2012, at 10:36 AM, Niel Skousen nskou...@talisman-intl.com wrote: I recall someone posting a heatsink that they'd done for the KX3, and were intending to provide an aftermarket

[Elecraft] KX3 heatsink

I recall someone posting a heatsink that they'd done for the KX3, and were intending to provide an aftermarket heatsink to the group.Can anyone forward me a link or email address to follow up with ? Thanks Niel __ Elecraft mailing