User's Manual Part 2

13
XDL Micro Intergrator’s Guide
Frequency planning
The transceiver contains a very sensitive, dual-conversion, super-heterodyne receiver.
CAUTION – Radiated and conducted signals to and from the transceiver may cause problems
due to interference. Correct attention to frequency planning may reduce interference from
radiated or conducted frequencies that fall within the pass-bands of the filters at the IF
frequencies.
Pacific Crest recommends you first analyse the product frequency plan (including
harmonics) and then use a spectrum analyzer to determine the potential for interference
within the pass-bands of the various front-end and band pass filters.
The following table indicates the frequencies and pass-band filter characteristics that are
areas of potential interference.
Circuit Center frequency (MHz) Bandwidth (MHz)
RF front-end 438 70
First IF 54.45 0.015
Second IF 0.450 0.010