[Elecraft] K3 & ADAT ADT-200A by HB9CBU

[David Cutter]

Some folk suffer extremely strong QRM from broadcasters on 40m (particularly 
on the east coast of Scotland) and to them there is a real desire for the 
best possible gear to hear weak stations amongst huge bc signals from 
Europe.  That's where receivers like the Perseus and others come in to their 
own.

David
G3UNA


----- Original Message ----- 
From: "Ron D'Eau Claire" <ron at cobi.biz>
To: <elecraft at mailman.qth.net>
Sent: Tuesday, December 02, 2008 10:14 PM
Subject: RE: [Elecraft] K3 & ADAT ADT-200A by HB9CBU


> John KD8K wrote:
>
> . This discussion does raise a few questions in my mind that I
> would like to ask. To me it is a question of the theoretical as opposed
> to the practical. Does it really matter if a receiver can hold up to a
> 80db over 9 signal 2 KHz away or is this just a theoretical exercise?
> Would not the transmitted Phase Noise, IMD, and perhaps key clicks be
> the limiting factor or am I wrong about this?
>
> Is there is a point of no return where increased close in dynamic range
> no long matters because modern transmitters simply can not or do not
> transmit a signal that clean. If so, then has the K3 and the Perseus
> reached that point of no return and the question of which one has a
> better close in dynamic range is more of a theoretical then a practical
> exercise.
>
> ---------------------------------------------------
>
> Good points to consider, *especially* realizing that the transmitter 
> you're
> hearing might have been built anywhere from 1930 onward. There's lots of 
> old
> gear in use out there, and there are a lot of homebrewers learning
> "hands-on" engineering building their own stuff with little or no 
> equipment
> to do this sort of critical analysis. It's all perfectly legal and proper 
> to
> use on the Ham bands - even encouraged.
>
> I doubt if many 1950 Viking I, Elmac, B&W, Hallicrafters or similar 
> vintage
> transmitters are found in contests these days. So the concern expressed is
> really by the hard-core highly-competitive contesters working in extreme
> conditions most of us will never experience. For others it's the fun of 
> the
> chase toward ever and ever "better" performance as an end in itself, 
> whether
> or not it has any practical application on the air. Those, too, are
> perfectly legal and proper pursuits - even encouraged.
>
> For the rest of Hamdom, these specifications are rather unimportant.
>
> Ron AC7AC
>
>
>
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