[Elecraft] Microphone capsule for K2

[David Wilburn]

I recently went back through and addressed my SSB alingments.  A couple
of important pieces of information that were passed to me, were;

A- set the bottom of the passband, so it starts a 300hz.  This is a very
near thing and relates closely to B.  I found, to get B correct, that I
had to set it so somewhere between half and three quarters of the slope
of the left side of the passband, was at the 300hz point.  

B- once you have set the passband (both upper and lower) stick a piece
of wire in the antenna connection of another rig, and transmit K2 into a
dummy load.  You can then make changes as needed.  

I initially set the bottom of the left edge of the passband at 300hz,
and the signals sounded high and pinched.  I then went back,
transmitting on the K2, and listening on another rig, and sorted it out.
Make sure and perform this on U & L sidebands and check it out on each
band.  I had U sideband on 80m sounding good, even though this is not
used, but then U sideband of 20m did not sound right.  It is sounding
more complicated that it really is.  Once you start listening on the
other rig, it comes together fairly quickly.

Just be careful after all of this, if you have KDSP2 and the KPA100,
putting it all back together.  I knocked a SMT cap off of my KDSP2 and
now it is KAPUT1. ;)
-  

David Wilburn
k4dgw at k4dgw.com
K4DGW
K2 S/N 5982


On Sun, 2008-01-06 at 13:29 +0100, Karsten Eppert (DK4AS) wrote:
> I have purchased together with my K2 an MH2 microphone short before it 
> was discontinued two years ago.
> The reports I receive always state, that the mike has too much bass.
> The filters of my K2 were checked with spectrogram and - to me - appear 
> correct.
> 
> In parallel I have tried a cheap boomset with an electret-mike. That 
> resulted in unfavourable reports like "sounds like a c-class-amplifier. 
> Too little bias current". So I checked the bias and it is ok.
> 
> Well - I?m looking for a good alternative now, but which one to select?
> 
> Go for a Heil Proset K2? I figure, that one contains the Heil 
> iC-electret-capsule. But what are the specs?
> 
> Go and replace the electret-capsule of my MD2 with a Heil HC-5-capsule? 
> What disadvantages will I have with such solution regarding frequency 
> response as the HC-5 apparently is a dynamic or condenser mike?
> 
> Can anybody share his experience with me?
> 
> 73
> Karsten
> DK4AS
> K2 #4764
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