RE: [Elecraft] here is how to get a feel for a roofing

Hi Brett, your questions are interesting but they requires many words to clarify them... I will try to give you simple answers and may be other friends will add replies. Message: 22 Date: Wed, 02 May 2007 11:38:44 -0400 From: Brett gazdzinski [EMAIL PROTECTED] Subject: RE: [Elecraft] here is

Re: [Elecraft] here is how to get a feel for a roofing

F.Y.I. I know of at least two experimental ANTENNA -- DSP designs that are out there being tested: HPSDR Mercury design http://hpsdr.org/mercury.html and Phil Covington N8VB's QuickSilver QS1R/QS1T design http://pcovington.blogspot.com/2006/12/qucksilver-qs1r-software-defined.html de ken

Re: [Elecraft] here is how to get a feel for a roofing

Additional comments on using an A/D at the front end of a radio. High Speed A/Ds that can handle the wide dynamic range of radio signals are still an art form. Any A/D suffers from the need to have filtering in front of it to avoid a malady known as aliasing. In A/D theory, without band

[Elecraft] here is how to get a feel for a roofing filter

Hi all: I knew this would be a tough one for many (most). Try this on for size Imagine that you walk into a very large office space (the band), filled with desks and a hundred people working at those desks. You sit down at a desk in the middle of the room. At first, nobody is talking

Re: [Elecraft] here is how to get a feel for a roofing filter

REALLY nicely done, Doug. An excellent analogy. And I would wager heavily on the correctness of your prediction. ;-) Bill / W5WVO DOUGLAS ZWIEBEL wrote: Hi all: I knew this would be a tough one for many (most). Try this on for size Imagine that you walk into a very large office space

Re: [Elecraft] here is how to get a feel for a roofing filter

The confusion here may be primarily one of semantics. The K3's main narrow IF filters -are- the first filters seen after the first mixer, just like those in the K2. Our first IF at 8.215 MHz acts as our primary narrow IF filter stage and can also be considered our roofing filter stage, since

Re: [Elecraft] here is how to get a feel for a roofing filter

Hello Brett! Is there no way to put dsp at/as the first filter? What are the limitations of the dsp, frequency, filter quality? Is there a problem getting dsp to work at say 455 khz? To answer these questions would take a textbook! Or at least a very long essay. The short version is: