Comtech EF Data SFC4200 - Manual (Page 18)

Operation SFC4200/SFC1275G Synthesized Frequency Downconverter
3-2 TM054 - Rev. 4.0
3.1.1 AS/4010 Converter First Mixer C-Band Downconverter (SFC4200)
The First Mixer module of the C-Band Downconverter accepts the input and has 30 dB of digital
gain control. Performance specifications for the First Mixer are listed on Table 3-1.
Table 3-1. AS/4010 Converter First Mixer C-Band Downconverter (SFC4200)
Standard Band Extended Band
Input Frequency 3.62 – 4.2 GHz 3.400 – 4.200 GHz
Input Power -40 dB Nominal -40 dB Nominal
Input Return Loss > -20 dB > -20 dB
Input Impedance 50Ù 50Ù
Gain 8 – 10 dB 8 –10 dB
Gain Control None None
Output Frequency 1.0225 – 1.0626 GHz
(70 MHz)
0.9325 – 1.0125 GHz
(140 MHz)
1.135 – 1.175 GHz
(70 MHz)
1.045 - 1.125 GHz
(140 MHz)
P
out
Nominal -30 to –32 dBm -30 to –32 dBm
Output Impedance 50Ù 50Ù
LO Input 4.6625 – 5.2425 GHz @
+13 dBm for 70 MHz IF
4.5925 – 5.1725 GHz @
+13 dBm for 140 MHz IF
4.555 – 5.355 GHz @
+13 dBm for 70 MHz IF
4.485 – 5.285 GHz @
+13 dBm for 140 MHz IF
3.1.2 AS/4011 Converter Second Mixer C-Band Downconverter (SFC4200)
The Second Mixer module of the C-Band Downconverter accepts the IF from the First Mixer and
converts and amplifies it to the 70/140 MHz, 75Ù IF Output. The Second Mixer has 40 dB of
gain control. Performance of this converter assembly is listed in Table 3-2.
Table 3-2. AS/4011 Converter Second Mixer C-Band Downconverter (SFC4200)
Standard Band Extended Band
Output Frequency 50 – 90 MHz Standard
(100 – 180 MHz [Option 01])
50 – 90 MHz Standard
(100 – 180 MHz [Option 01])
Impedance 75Ù 75Ù
Output Return Loss ≥
23 dB
≥
23 dB
P
out
P1 dB +20 dBm +20 dBm
Gain 30 – 32 dB 30 – 32 dB
Input Frequency 1.0225 – 1.0625 GHz (70 MHz)
0.9325 – 1.0125 GHz (140 MHz)
1.135 – 1.175 GHz (70 MHz)
1.045 – 1.125 GHz (140 MHz)
Detected Output 0 - 10 VDC
(10 VDC @ -10 dBm Out)
0 - 10 VDC
(10 VDC @ -10 dBm Out)