I was finally able to get my K2 (#0061) upgraded to a K2/100 just prior to
CQWW this past weekend. The KPA100 was bought in 2004 and sat on a shelf for
a year or two.
Anyway, I was doing some A/B checks after completing and testing the unit,
while trying to call some stations on 20 meters.
I compared a Yeasu FT-890 to the K2/100.
I noticed there were a few stations that I called and called on the K2, that
were then workable in one or two calls after switching over to the FT-890. I
did some power checks, and found that in CW mode, the K2 was the same, if
not slightly more power (reading on the same meter, same antenna, using an
A/B switch)
But on SSB, the voice peaks of the K2 are 25-30% lower than those of the
FT-890. I am using dynamic mikes on both radios... on the K2 it's a Yaesu
MH-31 Mic. I also used this mic on both radios and noted voice power peaks
almost twice that of the K2 (70 w vs 40w). My K2 is set for SSBA of 3, and
SSBC of 3-1. My KSB2 firmware is 1.07
I have seen a few references to mods on the KSB2, including swapping
resistors to increase mic gain. I have also seen references that they should
not be done on K2/100 units.
Are there any internal mic gain mods that can be used on the KSB2 in a
K2/100? Is there anything else I can do short of the external mic amp?
I also notice that sometimes I get full power on the first "letter",
sometimes it starts lower on "whiskey 1" and bumps up on "papa alpha" --
anyone else seen this on the K2/100?
Bill
W1PA (K2 FT #61)
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