[Elecraft] K2 SSB Performance Improvement

[Ray Collins]

Other K2 owners may be interested in this.  

After getting many reports of poor quality transmit audio with my K2 (using the Proset K2 Heil boom microphone and headset), I carried out the modifications described by G3RXQ which increase the lower cut off frequency of the microphone circuit on the KSB2.  This involves changing C34 from 2.2uF to 1uF, C31 from 2.2uF to 1uF and C20 from 0.33uF to 0.1uF.

Now, when I listen to my transmitted signal on another receiver, the audio now sounds much crisper with increased high frequency content.  I have also had many comments on the high quality of my audio and even someone reporting "BBC quality" audio. Well done G3RXQ!

I also spent considerable time trying to optimise the Tx BFO frequency by listening to my transmission on another receiver.  After many hours of careful BFO adjustment I finally ended up with the exact BFO frequency settings recommended in the KSB2 manual. Well done Elecraft!

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