Comtech EF Data SFC4200 - Manual (Page 19)

SFC4200/SFC1275G Synthesized Frequency Downconverter Operation
TM054 - Rev. 4.0 3-3
LO 1.1125 GHz @ +13 dB 1.225 GHz @ +13 dB
3.1.3 AS/4007 Converter First Mixer Ku-Band Downconverter (SFC1275G)
The First Mixer module of the Ku-Band Downconverter accepts the 10.95 – 12.75 GHz Downlink
and converts it to L-Band IF. Performance specifications for the First Mixer are listed on
Table 3-3.
Table 3-3. AS/4007 Converter First Mixer Ku-Band Downconverter
(SFC1275G)
Input Frequency 10.95 – 12.75 GHz
Input Power -40 dBm
Input Return Loss > -18 dB
Input Impedance 50Ù
Gain -5 to 6 dB
Gain Control None
Output Frequency 2.050 – 2.070 GHz (70 MHz) 2.100 –
2.180 GHz (140 MHz)
P
out
Nominal -34 to -35 dBm
Output Impedance 50Ù
LO Input 8.88 – 10.68 GHz @ +13 dBm for 70
MHz IF
8.81 – 10.61 GHz @ +13 dBm for 140
MHz IF
3.1.4 AS/4012 Converter Second Mixer Ku-Band Downconverter
(SFC1275G)
The Second Mixer module of the Ku-Band Downconverter accepts the IF from the First Mixer
and converts and amplifies it to the 70 MHz, 75Ù IF Output. The Second Mixer has 40 dB of
gain control. Performance of this converter assembly is listed in Table 3-4.
Table 3-4. AS/4012 Converter Second Mixer Ku-Band
Downconverter (SFC1275G)
Output Frequency 50 – 90 MHz Standard (100 – 180
MHz [Option 01])
Impedance 75Ù
Output Return Loss < -23 dB
P
out
P1 dB +20 dBm
Gain 34 – 35 dB
Input Frequency 2.050 – 2.090 GHz (70 MHz)
P
in
Nominal -34 to 35 dBm
Detected Output 0 – 10 VDC (10 VDC @ -10 dBm In with