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an.qth.net On
Behalf Of N2TK via Elecraft
Sent: Saturday, 20 May, 2023 15:51
To: m...@sj2w.se; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Power spike early K3
I had the same problem with the K3/KPA1500 combination. I recalibrated the
K3. Then I made sure I don't run the K3 at exactly
45 am
Subject: [Elecraft] Power spike early K3
Hi,
We have an early serial K3 which has got an issue with power spikes. I have
done a TX gain calibration without it making a difference. The spike
happens mainly when you have changed to a new band and during the first
transmission. After that the spike
I had a similar problem and traced it to voltage sag under load at the K3. The
power supply was good under load but there was too much loss in the stock cable
which was wired directly to the PS. I replaced it with a heavier, shorter
cable. I found that I had to run the TX gain calibration twice
Hi Mike,
I saw that you had posted a similar question
in January 2023 and had some suggestions
including running the TX Gain calibration, which
you did, but apparently without effect on the
spiking.
There have been numerous reports of
TX power spikes on first dit or first voice sound.
Some found
Hi,
We have an early serial K3 which has got an issue with power spikes. I have
done a TX gain calibration without it making a difference. The spike
happens mainly when you have changed to a new band and during the first
transmission. After that the spike is a lot smaller and not much of an
issue.
Hi guys,
I did try TX GAIN CAL and it failed on 30m. I had an issue in CQWW CW where
one of the ops placed the radio on 30m where there is no BPF so we burned
the classic D25 diode. I have replaced that and have gotten RX back and all
bands seem to work OK. However 30m behaves strangely also on RX
The first thing to do is run TX GN CAL. That usually stops the spikes. My
K3 #2254 began needing that every few months, and sometimes I had to run TX
GN CAL multiple times. Eventually, at Wayne's suggestion, I sent it in for
repair. They found some burned resistors in the LPA SWR circuit, which
I have #1504 and it does not add any spike ever. I have no idea what
would cause a spike. Does this happen on CW?
Dave K1WHS
On 1/19/2023 5:55 AM, Mikael Larsmark wrote:
Hi,
I have 5 pcs Elecraft K3 in my shack and one of them, which is a very early
model (serial #1938) suffers from quite a
I have a K3 SNR 1595 and it does not have power spikes.
Maybe TX gain cal will solve it as 4X6GP writes.
/ Jim SM2EKM
On 19/01/2023 12:55, Mikael Larsmark wrote:
Hi,
I have 5 pcs Elecraft K3 in my shack and one of them, which is a very
early
model (serial #1938) suffers from quite a power s
The first thing that is always recommended for this is to run the TX
Gain Calibration in the K3 Utility.
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 19/01/2023 12:55, Mikael Larsmark wrote:
Hi,
I have 5 pcs Elecraft K3 in my shack and one of them,
Hi,
I have 5 pcs Elecraft K3 in my shack and one of them, which is a very early
model (serial #1938) suffers from quite a power spike when transmitting.
You can clearly notice it on the amplifier and it is only this K3, none of
the others.
Can somebody give me some insight on this?
/Mike, SJ2W
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