[Elecraft] Power spike

[Mikael Larsmark]

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 where there
is a lot of noise, almost sounds like RTTY all over the band and no normal
signals and it goes away when I disconnect the antenna. When I try to
listen to the band with another radio it sounds normal and it is filled
with CW signals. Does anybody have an idea of what I can have burnt up that
only has an impact on 30m? 20m does not seem impacted so I ruled out the
LPF and I doubt it would cause the strange RX behavior.

/Mike, SJ2W

On Sun, Jan 22, 2023 at 1:58 PM Eric Norris <norrislawfirm2 at gmail.com>
wrote:

> 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
> were replaced.  I haven't tested it yet, because, you know, my K4D
> arrived.  :-)
>
> 73 Eric WD6DBM
>
> On Sat, Jan 21, 2023, 12:47 PM David Olean <k1whs at metrocast.net> wrote:
>
>> 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 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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