[Elecraft] K3 Tops the List!

[Geoffrey Mackenzie-Kennedy]

Hi Toby,

The 120db dynamic range is possible with both signals in the passband IF 
everything which follows the hybrid crystal filter is very robust and its 
noise figure is low, a low noise figure to keep the gain ahead of the filter 
as low as possible of course.

My QT crystals are to be delivered soon :-)

73,
Geoff
GM4ESD


Toby  <dj7mgq at muenchen-mail.de> wrote:

> 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