[Elecraft] K3 on-channel strong signal overload?

[Mike Harris]

Hi Don,

Quote
The two diodes limit the signal to 1.4 V peak-to-peak. Even when the 
diodes are conducting, i.e. when the signal

is so strong that it looks like a square wave at pin 4, there is no 
audible signal distortion. This is because the

MC1350 is followed by a second crystal filter which removes any harmonic 
distortion products (i.e. multiples of

4.915 MHz). The diodes appear to have no other side-effects.

Unquote.

Indeed, no distortion noted CW or SSB.

Regards,

Mike VP8NO

----- Original Message ----- 
From: "Don Wilhelm" <w3fpr at embarqmail.com>
To: "Mike Harris" <mike.harris at horizon.co.fk>
Cc: "Reflector Elecraft" <Elecraft at mailman.qth.net>
Sent: Monday, May 04, 2009 2:47 PM
Subject: Re: [Elecraft] K3 on-channel strong signal overload?


| Mike,
|
| That mod to the K2 (which has been incorporated into the new K2s) is
| simply a limiter.
| If the signal level at the input to the IF amplifier ever increases to
| the point where the diodes clip the signal, then distortion will occur.
| The clippping distortion may not be noticed on CW, but it certainly will
| distort SSB and data signals.