[Elecraft] K2 SSB Question

[Don Wilhelm]

Curt,

I do not know which threads you are referring to.  The K2 with the KSB2 
is quite good with excellent carrier suppression and will provide an 
audio passband consistent with the filter width you have installed on 
the KSB2 board.
If you have the older 2.1 kHz filter width, the passband placement 
becomes critical and may require some experimenting.  The 2.4 kHz width 
has been provided with the KSB2 for several years now and is not as 
critical.  The 2.6 kHz bandwidth gives excellent audio with even less 
concern for the exact placement of the passband.  No matter what filter 
width you have installed now, it is a simple matter of changing a few 
capacitors to alter the width - Elecraft provides a kit to do that if 
you wish.

The downside of the KSB2 is that it has no anti-vox, and that fact makes 
the VOX operation 'touchy' for data modes - it is better to use PTT for 
data modes, and the KSB2 does have limited microphone gain - it works 
very well with electret element mics and with the higher output dynamic 
mics, but if you are planning to use the lower output Heil dynamic mics 
(HC-4/5 elements), then you may have to add a microphone preamp.

Those are the pros and cons that I know about.

73,
Don W3FPR

Curt wrote:
> Completed K2 s/n 6424 a few months back, am thinking of adding a KSB2 
> adapter kit I own.  I've seen several threads indicating that the SSB 
> performance of the K2 with the adapter isn't very good.  Would adding 
> this capability be worthwhile, or is leaving the K2 as CW only a 
> better option?
>