Hi Jerry,
I was talking about 1940's to 50's before the Z Filter Hanbook was published.
You are correct about the issue of the low IFs then in use being a factor,
also.
But remember, there were no computers available to most engineers much less
hams in 1948 to 1960!
And when did the PC become common? I remember only having one of the first
$20 four function electronic calculators in about 1972!!
Thanks for bringing up IFs and a very good posting.
73, Stuart K5KVH
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