[Elecraft] Let's Try This Again -- was "[K3] ... A 750 Hz, 8-Pole ... Filter?"

[Jim Brown]

On Thu, 15 Jul 2010 14:53:10 +0100, Ian White GM3SEK wrote:

>Agreed. 250-270Hz would be the "sweet spot" for an 8-pole filter, to 
>guarantee good sales for the manufacturer *and* good performance for a 
>range of users in heavy QRM.

>Now let's see if Inrad or Elecraft take the bait :-)

Hang on a minute, guys. Inrad builds a nominal 250 Hz filter, Elecraft 
tests and re-sells it, and we buy it, because we've agreed that it's a 
sweet spot operationally. 

The issue is that it's wider than than at the -3dB points. So the 
problem appears to be that it's pretty difficult to build an 8-pole 250 
Hz filter at 8.8 MHz, and that Inrad has given up on doing better. 

73, Jim K9YC