Dear Don
I thank you for the information.
Following your advice. I looked first for a bad solder in the KSB2
module. As no poor solder was apparent, I decided to resolder all
connections. After this re-work the failure has been cured. The K27100
in SSB mode is working again as it had been until recently.
I thought that my soldering skills were good enough, but I was wrong. Hi.
Many thanks for your help ¡¡¡
Best regards, 73
EA3EZO Raimon
En/na Don Wilhelm ha escrit:
Raimon,
I do believe your first checks should be on the KSB2 option board.
Look at the schematic for the KSB2 in the lower left corner area - you
will find several passive components associated with Q1, D1 and D2 -
those are the components are in the SSB ALC section and are the ones
to check.
I would look first for a poor solder connection. It is not uncommon
for a marginal solder connection to fail after a few years even if it
worked fine initially - once an oxide coating develops, it will fail
(usually because of a higher than normal resistance at the
connection). It *could* be a component failure, but I would check the
soldering first and re-flow it if there is any question at all about
its current quality.
I tend to believe that the band dependency is a 'red herring' and is
the simple result of the fact that the intrinsic transmit chain gain
of the K2/100 goes down as the frequency is increased.
If you find no problem obvious on the KSB2 board, I would suggest that
you remove the KPA100 and test the base K2 for a similar condition.
73,
Don W3FPR
raimon wrote:
Hi all
I am having troubles with my K2, and need your help
.................................................
Now it continues to work all right in CW in all bands, but in SSB
power output drops substantiably in 20, 30, 15 ,12 and 10 meters bands.
I suspect the KSB2SSB module. Where should I look for the cause of
this problem?
Many thanks in advance
Raimon
EA3EZO
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
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