zhl_gs1980
Joined: 03 Feb 2005
Posts: 105
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 06 Feb 2006 4:48 [need help]about qpsk |
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I made a QPSK modulator with max2510,I AND Q derive from ad9763, I AND Q 10MHz; LO 350 MHz .
Problem:spectrum 340MHz AND 360MHz are equal ,and 350 MHz 20dB below than 340MHz and 360MHz. but theorily 340 and 350mhz are about 40dB below than 360mhz. addachment is my SCH.
THs!!
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