I use a Heil HC4 (DX) mike element in an upgraded hand mike.
I changed the mike gain with a resistor change as per mod.
I get very good audio reports - the mike has the 2K boost and the low
end cut... built in.
I never did the SSB filter upgrade and still running stock serial number
0985 K2...
72, Steve
On 20-Dec-14 5:29 PM, Ray Collins wrote:
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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