IRD User Guide
19
The following table defines the C-band to L-band conversion recommendations, giving both a best
engineering practice and a design limit for each value:
Table 12: IRD C-Band to L-Band Conversion Recommendations
Parameter
Best Practice
Design Limits
Input Frequency C-Band
3.7 to 4.2 GHz
3.7 to 4.2 GHz
Output Frequency L-Band
950 to 2150 MHz
950 to 1450 MHz
Input Polarization
Linear
Linear
Cross Polarization Isolation
25 dB Typical
20 dB Typical
Image Rejection
55 dBc Min.
40 dBc Min.
Output VSWR
2.0:1 Max. into 75
2.0:1 Max. into 75
Noise Temperature
15 to 25 K
25 K
Desired Channel Output
Power at L-Band
-25 to –60 dBm
-25 to –60 dBm
1 dB Output Compression
Point
0 dBm Min.
0 dBm Min.
Gain Flatness
0.5 dB over 30 MHz
1.0 dB over 30 MHz
Frequency Stability (aging
and temp -40 C to +60 C)
50 kHz Max.
3.0 MHz Max.
Phase Noise (Max.)
-60 dBc/Hz @ 100 Hz
-70 dBc/Hz @ 1 kHz
-85 dBc/Hz @ 10 kHz
-100 dBC/Hz @ 100kHz -
110 dBC/Hz @ 1 MHz
-55 dBc/Hz @ 1 kHz
-80 dBc/Hz @ 10 kHz
-100 dBC/Hz @ 100 kHz -
110 dBC/Hz @ 1 MHz
Short Term Frequency Slew
Rate (over temp.)
<100 kHz/sec
<1 MHz/sec
Non-Harmonic Spurious
-40 dBc Max.
-40 dBc Max.
Harmonic Spurious
-35 dBc Max.
-35 dBc Max.
Tuner parameters:
RF Tuner Stability
+/- 10 kHz
+/- 30 kHz
Phase noise
80 dBm
75 dBm
Noise Figure
8 dB
12 dB (w/o switch box ref.
Input level = 3 dB)
Input Return Loss
12dB
8 dB (same with switch
box)
RF In Isolation (950-2150
MHz)
40 dB
35 dB
LO Leakage
-70 dBm
-63 dBm
Temperature Range
0
to 60
C
RF Level
-25 to -60 dBm
