Jim Hackett wrote:
"clifto" wrote...
Jim Hackett wrote:
2. Are you seriously trying to tell me that the design of the FR-200
is
newer than the design of the 535?

1. Okay.
2. The 535 was first sold in 1991. Yes, I believe the FR200 was designed
after that. If you know otherwise, please enlighten me.

You are speaking manufactured. I am speaking designed.

FR-200 single conversion analog radio ---------several decades old design
NRD-535 PLL receiver -------------------------possibly a little newer
design

You're talking concepts. Conceptually, a front end is a front end, so all
receivers would have to perform the same if you're right. I'm talking
actual design, as in determining the circuit topology and calculating the
component values, and I'm betting the FR200 didn't hit paper before 1995.
It's the actual circuit topology and component values used that actually
determine sensitivity. And incidentally, PLL designs date back to the
1970's; I still have clippings from the tech journals of that period.

--
Britney Spears' Guide to Semiconductor Physics
http://britneyspears.ac/lasers.htm