Re: K2 PA Failure
Posted by
g3ymc on
Feb 17, 2011; 9:08am
URL: http://elecraft.85.s1.nabble.com/Down-conversion-tp5750644p6035155.html
The K2 has a real on/off switch. So always using that to turn it on and
off is certainly a good idea.
I am certainly puzzled at these claims of pa blowups. My original pair
of transistors is going fine after 9 years and some 30k QSOs. I have
removed the heatsink several times while fitting mods, and the last
time I replaced the heatsink washers as well, and have never had any
problems. I agree that the mechanical arrangement is not the best, but
it does the job.
73 Dave G3YMC
On 17 Feb 2011 at 3:14, John Ragle wrote:
> Am I missing something here? Seems to me that the rational thing to do
> is turn on the power supply and let it stabilize (should only take a
> second or two), then turn on the K2/K3? Turning a K2 or K3 on and off
> using the power supply switch never gives the firmware/software a chance
> to initialize or shut down...just like pulling the plug on your computer
> might well cause at least mild consternation to the machine! There are
> no enormous filter caps in either Kn machine that need to be serviced at
> power on. Seems to me that using a non-matched pair of transistors is
> much more likely to be the cause of failure, as someone has already
> pointed out.
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