I do not know where or when the term "roofing filter" first appeared, when I
first came across it in the late 1950s I was working in Canada. I suspect
that the term originated in N.America, most probably in connection with the
type of equipment which I mentioned, most of which was purchased by Common
Carriers for use on long haul international circuits.
73,
Geoff
GM4ESD
Jack Smith wrote:
One more data point on the term "roofing filter."
I have a copy of the June 1981 RSGB Radio Communications magazine that
reviewed Drake's TR7.
It describes the design as follows:
"A low-noise, wide-dynamic range amplifier is used at 48.05 MHz to
precede the 10-KHz wide roofing filter."
Leaving aside the RSGB's odd use of hyphens, it describes the filter as a
"roofing filter" although Drake does not use the term in its technical
manual.
Is it the case that "roofing filter" is UK terminology that has made its
way to the US side of the pond only recently?
Jack
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