[HBR] HBR "dated?" How so?

[Shoppa, Tim]

About "having all the selectivity at the second IF"... this
describes the vast majority of modern DSP radios.

i.e. Everything old is new again.

Of course you can pay extra money for a "roofing filter" today.

Over the years the swing between "single conversion receivers are crap"
to "double conversion receivers are crap" and back has occured at least
five times in my memory :-). I am sometimes an even number of generations
behind the avant garde, although that even number is usually 8 or 10!

In terms of homebrew construction, the plug in coils are pure genius (but
hardly innoateive in the decades preceding the HBR).

Tim N3QE

Peter writes:

> Dated?
> Much better tube choices became available after the design was published.
> Having all of the selectivity at the second IF is also passe with the advent
> of good quality, cheap xtal filters. Plug in coils are a pain, but probably
> a worthwhile tradeoff for Q. Toriods would do a better job for the RF stages
> in a modern design.