I have imperfect recollections that the source of the term "roofing
filter" came from the idea that the filter put a "roof" over your
receiver to prevent very strong, off-frequency signals from getting in.
You'll need to crank up your imagination here ... similar to the roof
of your house keeping out things falling from the sky while desired
things can still enter through the doors. I did say "imagination." :-)
I do also agree, it's probably not a particularly descriptive name, but
the filters do have a purpose in SDR's like the K3. I think most of the
thread was aimed at the differences between the various filters
available for the K3.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2014 Cal QSO Party 4-5 Oct 2014
- www.cqp.org
On 5/12/2014 12:01 PM, Bill Turner wrote:
I still don't get it. What does the word "roof" have to do with
bandpass? That's where the confusion comes from.
73, Bill W6WRT
dez...@outlook.com
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