[Elecraft] K2 VOX - Straw Poll - Follow up - Long

[Stewart Baker]

On Thu, 19 Aug 2004 08:40:26 -0500, Tom Hammond wrote:
> Hi Stewart:
> Will the board be thin enough to allow its installation in K2s with the
> KPA100 installed as well?
> Regards,
> Tom Hammond    N0SS
> At 04:12 AM 8/19/04, you wrote:
>> ... snip...
>> To cut to the chase. I have spent some time thinking about the KSB2
>> problems and after much design work using a circuit simulator have come up
>> with a solution to address items 1-4. This solution is at a breadboard
>> stage at present (sitting next to my K2/100), and is working very well.
>> Although it is far from complete I can give some brief details, so you
>> might care to comment.
>> It will be a PCB that sits above the audio section of the KSB2, connecting
>> via approx 6 short wires to the KSB2 PCB. It will require 1 track cut and
>> 1 component to be removed from  the KSB2 PCB.
>> It will have the following:-
>> a) An integral tailored microphone pre-amp with Mic gain
>> adjustable from 0 to +20dB. The input impedance will
>> be 500 ohms.
>> b) An independently adjustable VOX gain control, driven
>> from the microphone, and NOT the speech compressor output.
>> c) A fully adjustable Anti-VOX function that is derived from
>> the speaker output.
>> As I said there is still some work to be done, but I will keep the group
>> informed of my progress.

Good point Tom,

To be honest I had not even considered that. I have my KPA100 installed with the
KAT100 in an EC2 case.

Looking at the clearance left by the KPA100 in the EC2 case I doubt that there
is enough head room above the KSB2 if the amplifier were mounted in the K2.
There are precious few spaces left to put anything.  I need my VOX to work the
way I want, so compromises must be made. I guess the solution could be done in
SMD, but that's rather against the K2 ethic.

73

Stewart G3RXQ