This is an old thread, but is something that I have struggled with on my own
K2. I also had some RF feedback that was mixed with this, but I have cured
that.
So now I am left with the very similar symptoms where there are too many ALC
lights lit for 40m and it overdrives my KPA500. I had to play
Hello Group,
Just to complete the loop and to say thanks to Don, Steve and others who
contributed to this discussion.
I've applied the mod to the KSB2 board - 1k0 resistor in series with the
base of Q1 and changing the value of R9. The ALC's can now control the
output power of my K2 on 80/40/30
John,
At this point, check the audio drive and the SSBA menu parameter - which
should be at 1 for the MH2 (or other electret microphone). SSBA = 2 and
SSBA = 3 are both the same and are normally not used with these microphones.
If you have any audio preamplifier installed, remove it for use
John:
The values I used are in the 1st link I sent, if you dig down far enough.
"I put a 1k resistor in series with the base of Q1 in
the KSB2 and put 3.3k in parallel with R9. It's
pretty fiddly work on this compact board, but doable.
This is in the middle of the range for R9 suggested
Don,
The KPA100 is new -from Elecraft in September 2010 - and it therefore is the new
design with the blue toroids @L16/RFC1. The shield is installed as instructed,
using the 2 solder lugs to the SO-239 socket.
I took the KPA100 off the top of the rig, as you suggested, but there is no
differenc
John,
Is this a relatively new KPA100, or did you purchase an older kit from
someone who never built it?
The reason I ask is because the older T/R switch design had elements
that could cause parasitic oscillations near 40 meters, and often was
most noticeable on SSB.
If your KPA100 has blue
Steve, thanks.
I'll investigate the suggested mod to the KSB2. Have you had to do this mod
yourself? Did those resistor values work out about right for you (1k0 and
1.5k)? Did the mod significantly affect the ALC action on higher bands?
I don't want to scarifice too much power out on 20m.
T
>Is there any way of making the ALC more aggressive on 40m SSB, without
>affecting the other bands too much? I remember seeing a previous post
>about this somewhere but haven't been able to find the details again.
>Any suggestions?
>73,
>John
>VK7JB
John:
You probably have the diagnosis exact
Hello again folks,
Sorry about the barrage of posts from me. Just playing with my K2/100 #6998.
I've noticed that when operating in SSB on 40m, requesting any power 15-20
W and up will always give me 100W+ output, measured into a dummy load.
Voice peaks are higher and result in Hi Curr warning
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