Posted by
Don Wilhelm-3 on
Oct 30, 2006; 5:10am
URL: http://elecraft.85.s1.nabble.com/Mic-Gain-K2-100-tp394881p394891.html
Bill,
The Yaesu MH31 mic will normally drive the K2 to full output with no
problem.
I really cannot coment on the difference between your Yaesu and the K2 power
out as indicated on your meter - I do not know how your particular meter
responds, but I know you have a mic gain control on the Yaesu front panel,
and it can be easily overdriven giving the appearance of greater power
output.
The K2 LED will indicate the peak output power in most cases. For any
particular power setting, switch to CW and key the K2 while observing the
LED meter (in RF mode of course) to see how many LEDs are illuminated. Then
switch to SSB - if the peaks go up to the same point as you saw in the CW
test, you are driving the K2 to full PEP output. If you want more average
power, increase the compression setting.
73,
Don W3FPR
> -----Original Message-----
>
> 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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