[Premium-Rx] WJ8718A i.f. filters

[Massimo Corinaldesi]

I read the data sheet of the WJ-8718A hf receiver, and I was surprised 
to see the shape factors of the i.f. filters are very high.
I think in the years the 8718A was conceived - I suppose first half of 
'80 -, the technology allowed i.f. filters having better shape factors.
Why they did so ?

That's just a technical curiosity.

Thanks.

   Massimo Corinaldesi  I0MCF
   Roma
   Italy