[Elecraft] [K2] ALC and power control on 40m SSB in K2/100
VK7JB
zendoc at netspace.net.au
Mon Nov 8 18:15:54 EST 2010
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 warnings occasionally. I can
reduce the power above this threshold only by changing SSBC to 1:1 (normally
run at 2:1 with my MH-2 mic) and winding the power out back to just on 11 W.
CW and TUNE modes - all OK: power requested and power output track very
well on all bands, including 40m.
Bands above 40m on SSB are not affected - I mostly work 20m SSB and haven't
noticed the power tracking issue there. ALC seems to control the power out
well there.
I suspect the Tx chain gain on 40m is too high for the ALC to manage when in
SSB.
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
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