Re: [K3] CW transmit filter bandwith

Posted by Don Wilhelm-4 on Jan 17, 2011; 6:39pm
URL: http://elecraft.85.s1.nabble.com/K3-CW-transmit-filter-bandwith-tp5932777p5932825.html

  Graham,

Tom W8JI was dealing with analog transceivers when that was written.
The K3 generates the signal digitally in the DSP portion of the
transceiver, so many of those old "rules of thumb" for analog radios do
not apply to the K3.  As Guy has said many times on this reflector,
"This is not your grandaddy's analog radio".

A properly operating K3 does not have key clicks and its transmit IMD is
very good.

73,
Don W3FPR

On 1/17/2011 1:09 PM, Graham Smith wrote:

> I was reading W8JI's article http://www.w8ji.com/what_causes_clicks.htm but
> see that the advice in it (use a narrower filter than an SSB filter for
> transmitting CW) conflicts with the K3 manual, which says:
> "Rotate VFO A to select a CW transmit filter (2.7 or 2.8 kHz). Note: Key
> clicks may result if a narrower filter is selected for CW transmit."
> Of course I will take the K3 manual's advice, but I am wondering why a
> narrow filter can cause key clicks?
>
> 73 de Graham G3ZOD FISTS #8385
> http://www.fists.co.uk
>
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