Quadrature downconverter image rejection test data

Downconverter Image Rejection Test

August 17, 2004

SETUP:
LO: 400 MHz, -10 dBm (200 MHz actual LO)
IF: 210, 220, 230 MHz (10, 20, 30 MHz baseband)

Outputs (I/Q):
  - gain adjusted for ~80% full scale using spectrometer board
   software: gdiag -scope

  - image rejection tested using spectrometer board
   software: gdiag -cfft

Measured Image Rejection (dBm)
Board Serial No.	Baseband Frequency
Board Serial No.	10 MHz	20 MHz	30 MHz
SAMPLE	47	40	42
0A	46	44	40
0B	48	40	36
1A	48	40	35
1B	48	40	41
2A	50	45	37
2B	50	44	34
3A	50	45	42
3B	42	35	31
4A	43	36	32
4B	38	36	33
4B'	42	38	33
5A	48	45	36
5B	50	40	40
6A	46	40	34
6B	48	46	43
7A	47	42	37
7B	50	41	34