[Elecraft] K2 RF Speech Processor?

[Karl Larsen]

Karl-Heinz Kaatz, DF7KHK wrote:
> Hi Karl,
>
>>    A question. Does the K2 have a variable resistor at R! Compression 
>> ratio set?
>
> Yes, the resistors RP5 are the 'variable' resistors for compression.
>
> Yesterday I had send a mode for other compressions. With other 
> resistors you make your own three compressions.
>
> 73/72 de
> Karl-Heinz, DF7KHK
>
>
    First your name reminds me of my name and the name of a Collage 
buddy Heinz Gelhaar. We had a lot of fun together.

    The K2 has a Analog Devices SSM2165* which is a 8 pin chip with 
external capacitors and one resister. The values of the capacitors is 
the result of a  design calculation. It sets up the internal amplifiers 
to work over the actual audio input levels. It can serve as a mike input 
amplifier to a SSB transmitter.

    This might explain the problems people are having with various 
mike's not working well on the K2. The SSM2165 wants a design center 
mike input signal to work well.

    The Compression Ratio set resistor does set the compression in this 
device and since it's there it can be experimented with.

    So it is safe to say the K2 already has speech compression built in.

73 Karl K5DI