I forgot to say that eveything was OK in CW... The problem was only in SSB.
73
Jean-François Ménard a écrit :
A very strange way to solve my problem was to «hard reset» the K2. And
setting up from scratch with all needed values.
This is the second time that I solved a problem with a «hard reset».
The first time, a friend of mine brought me his K2 because he had TX
problem in CW. His problem was like he was transmitting 7-8 kHz wide
in CW. All BFO and filters values were OK, but after a «hard reset», I
set again all values and everything was working fine.
I got another strange problem here with mine this time. On TX SSB,
people received me like I had RF feed back. I recorded my audio myself
with my computer, and yes I have ripple in my TX.... even with
different microphone, and at 5W in a dummy load.
A reset cure the problem, or at least, since the reset, I did not have
the problem anymore. I connected my PC audio to my K2 mic with an
adapter using an interface between them and transmitted in a dummy
load a few MP3 over the air. The received signal on my KX1 seems to be
all OK now. Now glitch or ripple.
It seems to me that some values written in the EPROM was corrupt, or
at least, not good...
Does anybody got the problem before ?
Don Wilhelm a écrit :
Jean-Francois,
Can you check your microphone? That sounds a lot like a bad mic
element to
me. Try another mic if you can - if you are wired for the electret mic
(with the resistor), then you can even use one of the inexpensive
computer
mics.
In any case, substantiating that the mic is good is the first step in
troubleshooting a problem like you described.
As an alternative you could feed known clean audio into your K2 from an
audio generator, or even make up a voltage divider and feed audio
from the
computer soundcard or a portable CD Player into the K2 (just don't
transmit
on the air). Using a controlled audio source will allow you to
troubleshoot
a problem inside your K2 with your 'scope much easier than trying to
do it
live with a microphone.
If you do not know how to build up the voltage divider required, take
a look
at some of the PSK31 'how-to' websites for the simple interface
schematics -
you need only the soundcard output half of the interface.
73,
Don W3FPR
-----Original Message-----
I have a K2 that work great since 2003, but this morning.... Nop.
Nothing change on my setup, I was just operate my rig this morning as
usual and found this morning that my SSB TX audio looks horrible...
sounds like RF feedback a few hams told me..... but...
I tried the K2 on a dummy load and listened up with my KX1, and I found
that when I start to speak, the audio is like «scribble» or like a
defective speaker that fuzz. It seems to be worst at the beginning of
the transmission. I have only 1 bar or 2 on ALC reading. It sounds like
overdriven, but ALC reading on the bar graph seems OK.
I also remove every options and installed my un-mod kit to replace
options. I'm running the basic K2 with only the SSB adapter...
nothing else.
I did again the SSB calibration procedure, nothing at all,
everything is
OK on this side.
I tried every audio gain and compressor combination, the problem still
there, not worse, not better.
Does somebody have something to suggest me to start with ??? This is my
first real problem from the beginning, so I don't have much experience
in finding problem.
I have a scope, but with not much experience on how to test...
Thanks for your help !!
J-F VA2VYZ
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