[Elecraft] [K3] Roofing filters are misunderstood

[David Gilbert]

Actually, a roofing filter does exactly what it says.  It protects 
against ...  i.e.,  does not allow to pass ... out-of-passband signals 
from affecting the ADC or hardware AGC.  It's a "roof" against unwanted 
energy and a window for desired signals.  So would you prefer to call it 
a "window?"  Have at it, but that doesn't alter the fact that its 
fundamental purpose is to protect ... protect the ADC and protect the 
AGC so that they can perform their function properly.   And it doesn't 
mean that anybody will recognize what you're talking about, which is 
probably more relevant than the semantics involved.

Dave   AB7E


On 5/12/2014 3:38 PM, Bill Turner wrote:
> ORIGINAL MESSAGE:          (may be snipped)
>
> On 5/12/2014 12:38 PM, Josh Fiden wrote:
>> "The term “roofing” stems from the fact that it protects the rest of 
>> the radio following it from out of the passband signals."
>
> REPLY:
>
> A roof keeps what falls on it (rain, snow) out. It doesn't pass it 
> through.  Just the opposite of what a so-called roofing filter does.
>
> I prefer names that are pretty much self-explanatory. This one isn't.
>
> 73, Bill W6WRT
> dezrat at outlook.com