Thank you, Keith.
It was indeed a poor solder joint on one end of D1 on the LPA board; there
was a hairline gap between the solder and the terminal of the diode.
Reflowing the solder has cured the problem.
Peter
M0RYB
Hi Peter;
It definitely had one bad FET on the LPA when it was here, I do not
Hi Peter;
It definitely had one bad FET on the LPA when it was here, I do not see
in the report that it was intermittent, so I may not have looked closely
for those types of failures.
If you are sure it makes MW power when it is in the failure state, then
it is highly likely the LPA.
Inspect
Subject: [Elecraft] Intermittent loss of power output K3
Good day
Late last year, my K3 (no 6957) developed a fault. The symptoms were:
1. No power output when keying the rig
2. TX LED on when keyed, (sidetone generated in CW mode)
3. Single bar showing on the RF power meter, whatever scale, ie
Look at the two diodes in the SWR/watt meter circuit. These two diode are
critical to the operation of the K3. These are the foundation of the K3s
ALC implementation. Ive had to replace them.
Lee K0WA
On Fri, Mar 1, 2019, 8:47 AM Peter Lock wrote:
> Good day
>
> Late last year, my K3 (no
Ray:
I get the same relay chatter, no display of SWR and no output. Some time later
I may do the same ATU and it works. Appears to do the same thing as when
attempting to load an actual antenna.
Because this discussion has begun, I think I will set up again on the bench and
see if it will
What happens when the rig is connected to a dummy load?
73 de RayK2ULRKX3 #211
-Original Message-
From: John Saxon via Elecraft
To: elecraft ; Peter Lock
Sent: Fri, Mar 1, 2019 10:12 am
Subject: Re: [Elecraft] Intermittent loss of power output K3
Peter:
This is John Saxon, K5ENQ
Peter:
This is John Saxon, K5ENQ, in Pearland, TX, and I have experienced what appears
to be the identical symptoms. Also have contacted support, got some
suggestions, tried them to no avail (mostly dealing with possible rf grounding
issues). Like you, it may operate perfectly for hours or
Good day
Late last year, my K3 (no 6957) developed a fault. The symptoms were:
1. No power output when keying the rig
2. TX LED on when keyed, (sidetone generated in CW mode)
3. Single bar showing on the RF power meter, whatever scale, ie 0 - 10 or 0
- 100
4. ATU tune command: relays clicking,
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