[INRAD] IF circuitry design

[George Cutsogeorge]

Zoli and the list,

The tee network you see in series with the ceramic filters in the MP sub rx 
are to equalize the gains through the different paths.  You will note that 
the option filters also have tee networks for the same reason.  Reversing 
the network and filter will have very little effect at that point in the 
rcvr as the noise floor and dynamic range are pretty much determined by the 
time the signal reaches the second mixer.

The best way to improve the dynamic range of a radio with a minimum of 
effort is to make the roofing filter narrower.  Inrad will have the 47.21 
MHz filters available in the future.  They are on the list for the next 
order.

There are some very good books out there that cover receiver design.  Here 
is a partial list of some of the best:

1. Introduction to Radio Frequency Design.  ARRL, Hayward.
2. Single Sideband Systems and Circuits, 2nd ed.  Sabin/Shoenike McGraw Hill
3. Communication Receiver Design. Rhode/Whitaker  McGraw Hill
4. Radio Receivers. Gosling IEE

George, W2VJN