[Elecraft] K2 Preamp on and huge key clicks. Normal?

[Robert McGwier]

WHen the noise is repetitive and the blanker gates the
receiver off in a quasi-periodic fashion, this will act like
a mixer.  Since the pulse repetition rate (such as in a car)
is pretty low, it will mix all sorts of nearby signals into the
passband of your filter.  There is a way around this and with
the advent of more and better DSP, the impulse noise cancellation
problem will get better and better.

Bob


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Eric Swartz WA6HHQ
- Elecraft
Sent: Thursday, June 03, 2004 4:52 PM
To: Andreas (KU7T)
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K2 Preamp on and huge key clicks. Normal?


Hi Andy,

Was your noise blanker ON?  If so, the additional gain from the pre-amp
could
increase the NB's tendency to cause strong signal IMD. This is true of all
noise blankers.

73, Eric  WA6HHQ


Andreas (KU7T) wrote:

> I sometimes noticed that issue before, mostly when I was mobile operating.
> But this time, I hardly could do any contest exchange without retries.
> Without thinking, I turned of the Preamp and the clicks where gone.  I
> usually work with Preamp on, especially on 20, since I just use low wire
> antennas.

>
> Is this normal behavior of the Preamp?  If so, can someone explain to me
why
> this is the case?  Is the RX overloaded?  If this is not normal, where
> should I start troubleshooting?


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