[Elecraft] Re: k2/100 topband operation

[Larry East]

At 04:06 AM 12/17/03 -0500, Bob N6WG wrote:
>I'd like to see some sort of clipping or amplitude limiting circuit
>for the K2 that would set an output limit on receive audio to keep
>us from these "surprises".

I've used a couple of back-to-back PIN (or Ge) diodes to ground between the 
audio out and headphones as clippers with other rigs with poor (or no) AGC. 
A resistor in the 10-20 Ohm range is placed between the audio out and the 
diodes, and a small 100-Ohm or so pot can be inserted between the diodes 
and ground to provide a crude threshold control. Such an a arrangement 
causes some distortion then large signals are encountered, but at least is 
saves your ear drums. :-) The diodes, resistor and pot and be built into a 
small external box with appropriate connectors and/or cables and used with 
any rig.

One note of caution: There can't be any DC across the audio out or one of 
the diodes will be turned on all the time! (Not normally a problem -- DC on 
the audio out line, that is.)

72/73,
Larry W1HUE/7