Grant et al;
I can agree that many hams do not understand the application of
"filters" in a radio, specially today with the advancements in DSP
technology. I find today that many many hams rely on "old school
methodology" to justify what they do. They, for the most part, seem to
shy away from learning and understanding how things work today. Times
have changed. In fact I see more and more the adage of "what someone
said" taking precedence.
The roofing filter concept protects the AGC, just as the DSP provides
the selectivity. For strong signal operations one should have both.
But in many cases in our normal QTH environments, little is to be gained
with added roofing filters.
This is a slide presentation from Sherwood Engineering on FILTERS, why
and why not. http://www.sherweng.com/documents/Barc2008.pdf
<http://www.sherweng.com/documents/Barc2008.pdf>
I'll take his word for it. It is well worth the read.
73
Bob, K4TAX
On 2/27/2019 12:22 PM, Grant Youngman wrote:
Just an opine. Since these are ROOFING filters, and not the means of
determining the radio’s ultimate selectivity, you may not notice a substantial
performance improvement of the radio with 8-pole vs 6-pole filters.
I have my flame suit on, just in case — (it can be almost guaranteed to be
needed around here). :-)
Grant NQ5T
K3 #2091 KX3 #8342
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