Hi Keith,
I don't think so. Everything worked fine during the NA SSB Sprint on Saturday
evening and I was using the amplifier. Then when I went to use it Monday I
noticed the power output was lower.
But based on what I am seeing it does appear to be the LPA. If it was an issue
with some sort of RF Energy Kickback and I was using the amplifier with the
output set to 100 watts, would it really damage the LPA and not the HPA?
Regardless, I will either need to swap out the LPA itself or replace the
transistors in the LPA I have here, which I am happy to do. Is the transistor
different from the ones used on the K3 LPA? Since I have some K3's here I
could grab one out of them in the short-term.
Any other ideas or suggestions for repair?
73 Bob KW8N
On Thursday, March 27, 2025 at 01:33:53 PM EDT, Keith Trinity WE6R
<ke...@elecraft.com> wrote:
Hi Bob;
Did you have an "event" with an external amplifier? Like transmitting
with no load causing an oscillation and "kick-back" of RF energy back to
the K4.
I see you confirmed the LPA is damaged and posted on the groups.io forum.
Keith WE6R K3/K4 Tech
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
