[Elecraft] K3 Tops the List!

[dj7mgq at muenchen-mail.de]

> I wonder if it is physically possible to do anything about the far out
> dynamic range beyond 10kHz which is a "mere" 104 dB.

Take a look at <http://www.xs4all.nl/~martein/pa3ake/hmode/>:


This is a quote from the conclusion:

It turns out to be quite possible to construct a frontend with a  
dynamic range in excess of 120dB in SSB bandwidth on 40M. The best  
news maybe is that it is possible with components that are readily  
available today. No impossible to get specialized surplus parts are  
needed. Everything is still off-the-shelf, also the special QT  
crystals used in the roofing filter. However good quality polystyrene  
capacitors may become more and more a problem as many manufacturers  
have stopped production of those capacitors as far as I know years  
ago. Most certainly alternative good RF grade caps will remain  
available, although probably a bit expensive.

<http://www.xs4all.nl/~martein/pa3ake/hmode/conclusion.html>


vy 73 de toby