[Elecraft] [K3] Phase Noise / CW Key Clicks

[Joe Subich, W4TV]

> What has been pointed out here and what Lyle said yesterday (see
> below) and what others have pointed out in their own ways has
> demystified a subject that, once couched in simple words, is not so
> hard to understand.

Put another way, so many of the offending transceivers run the transmit
IF "wide open" to insure sufficient drive to the final amplifiers and
rely on ALC feedback to reduce the gain as necessary.  This assures
that the phase noise from multiple synthesizers and low level noise in
the amplifiers themselves will *all* appear in the output as much as
20 dB higher than a rig like the K3 where the IF gain is properly
controlled.

73,

    ... Joe, W4TV


On 9/13/2012 2:53 PM, gary bartlett wrote:
>
> And thanks from me too.  What has been pointed out here and what Lyle said
> yesterday (see below) and what others have pointed out in their own ways has
> demystified a subject that, once couched in simple words, is not so hard to
> understand.
>
> Quote from Lyle KK7P:  Transmitted broadband noise is often much higher than
> phase noise from the various oscillators.  In general, I'd expect the
> transmitter broadband noise to be higher, perhaps much higher, than the
> phase noise contribution from the oscillators.  The noise contribution from
> low level transmit buffers, for example, can be significant. Unquote.
>
> Thanks, guys.
>
> 73,
> Gary VE1RGB
>
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ethan Miller K8GU
> Sent: September 13, 2012 2:48 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] [K3] Phase Noise / CW Key Clicks
>
> Interesting point---thanks for clarifying that, Alan.
>
>
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