You can't turn the K3 fully on with the PSU power switch otherwise
nearly everyone would be doing it all the time.
Regards,
Mike VP8NO
- Original Message -
From: "John Ragle"
To:
Sent: Thursday, February 17, 2011 5:14 AM
Subject: Re: [Elecraft] K2 PA Failure
Yes you are missing something.
The power supply was first switch on, then the K2.
At switch on the capacitors into the K2 charges themself, and the power supply
answered to this by emiting spikes.
I never write that all power supply have the same behavior, but for mine, it
explained the K2 PA tra
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
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 initializ
Hi to the group,
When I had my K2/10, I had multiple failures of the PA transistors.
Close investigation showed that the problem came from my switching power
supply (a professional 5A one from Friwo).
When switching on the K2, the power supply emited large spikes that
destroyed the PA transistor
hout the trouble of sending back for repair.
>
> You may wish to take this chance to investigate why the PA of your K2 keeps on
> failing. It is a very unusual circumstances.
>
> cheers,
>
>
> Johnny VR2XMC
>
>
>
>
> ________
> 寄件人
收件人﹕ Elecraft
傳送日期﹕ 2011/2/17 (四) 4:15:25 AM
主題： Re: [Elecraft] K2 PA Failure
---
Hi Folks,
I have had another PA transistor failure in my 2003 vintage K2. The
transistors have been replaced several times over the years and the
board is now a mess.
I'm planning to rebuild the PA on an exte
John,
K2 PAs are generally extremely reliable, and the heat sinking is
entirely adequate as determined by extensive temperature tests of the
PA device itself and the heat sink. There are some 7000 K2s in the
field and few failures.
This suggests that you may have a defective part elsewhere
---
Hi Folks,
I have had another PA transistor failure in my 2003 vintage K2. The
transistors have been replaced several times over the years and the
board is now a mess.
I'm planning to rebuild the PA on an external board with a proper heat
sink mounted on the back panel of the K2. This wi
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