Modular construction (was RE: [Elecraft] K2 receive sensitivity)

[Geoffrey Mackenzie-Kennedy]

Space is certainly a factor unless the designer is prepared to employ 
shielding, filtering and ground fencing. I believe that construction using 
shielded modules has a great deal to offer, and I am not convinced at all 
that in the long run the method is 'too' expensive *if* equipment 
performance is used as the yardstick. Certainly easier to add options 
provided that some system design thinking had been done at the outset. 
Small high performance filters in my experience require some form of 
shielding between resonators and great attention to leakage past the filter, 
but it can be done e.g. 14 pole HF crystal ladder filters with the crystals 
side by side in a straight line.

73,
Geoff
GM4ESD


----- Original Message ----- 
From: "David Cutter" <d.cutter at ntlworld.com>
To: "Geoffrey Mackenzie-Kennedy" <gmk at gm4esd.fsworld.co.uk>
Sent: Friday, January 19, 2007 6:47 AM
Subject: Re: RE: [Elecraft] K2 receive sensitivity


>I read about that some while ago but have not come across such receivers. 
>My guess is that the limiting factor is also governed by space, ie how do 
>you make a high performance filter fit a small space, vis leakages.
>
> David
> G3UNA
>
>