Posted by
Mike Harris-9 on
May 04, 2009; 8:34pm
URL: http://elecraft.85.s1.nabble.com/K3-on-channel-strong-signal-overload-tp2785612p2789249.html
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" <
[hidden email]>
To: "Mike Harris" <
[hidden email]>
Cc: "Reflector Elecraft" <
[hidden email]>
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.
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