Super Heterodyne RF Front End
RF Signal Acquisition
Assembly
Figure 3a: Top side of assembly.
Figure 3b Reverse side of assembly.
Design Notes
Figure 11: Superhet converter schematic.
The First LO
The first LO makes use of an HMC833 PLO module with the following hardware configuration:
A resistive splitter on the HMC833 RF output.
An LFCN-2850 2850 MHz low pass filter and HFCN-2700 2650 MHz high pass filter on the split outputs prior to the output buffer amplifiers.
A SKY65017 buffer amplifier after the HFCN-2700 high pass filter for the RF B output. (SKY65017 broadband gain block)
A SKY65014 buffer amplifier after the LFCN-2850 low pass filter for the RF A output. (SKY65014 general purpose gain block)
Frequency (MHz) |
Buffer gain |
Power (dBm) |
|---|---|---|
25 |
MAX |
1.0 |
50 |
MAX |
9.0 |
100 |
MAX |
9.0 |
200 |
MAX |
10.0 |
300 |
MAX |
11.0 |
400 |
MAX |
12.0 |
500 |
MAX |
12.0 |
600 |
MAX - 3 |
10.0 |
700 |
MAX - 3 |
10.5 |
800 |
MAX - 3 |
11.0 |
900 |
MAX - 3 |
11.0 |
1000 |
MAX - 3 |
11.0 |
1100 |
MAX - 3 |
10.5 |
1200 |
MAX - 3 |
10.0 |
1300 |
MAX - 3 |
10.5 |
1400 |
MAX - 3 |
10.5 |
1500 |
MAX - 6 |
11.0 |
1600 |
MAX - 6 |
10.5 |
1700 |
MAX - 6 |
10.5 |
1800 |
MAX - 6 |
10.0 |
1900 |
MAX - 3 |
11.0 |
2000 |
MAX - 3 |
9.5 |
2100 |
MAX |
10.5 |
2200 |
MAX |
9.0 |
2300 |
MAX |
8.0 |
2400 |
MAX |
9.5 |
2500 |
MAX |
10.5 |
2600 |
MAX |
11.5 |
2700 |
MAX |
11.0 |
2800 |
MAX |
10.5 |
2900 |
MAX |
9.5 |
Frequency (MHz) |
Buffer gain |
Power (dBm) |
|---|---|---|
3000 |
MAX - 6 |
1.9 |
3100 |
MAX - 6 |
2.0 |
3200 |
MAX - 6 |
1.2 |
3300 |
MAX - 3 |
2.6 |
3400 |
MAX - 3 |
2.4 |
3500 |
MAX - 3 |
2.2 |
3600 |
MAX - 3 |
2.3 |
3700 |
MAX - 3 |
2.8 |
3800 |
MAX - 6 |
2.4 |
3900 |
MAX - 9 |
1.8 |
4000 |
MAX - 9 |
1.8 |
4100 |
MAX - 9 |
2.4 |
4200 |
MAX - 9 |
2.9 |
4300 |
MAX - 9 |
3.3 |
4400 |
MAX - 9 |
3.3 |
4500 |
MAX - 9 |
3.8 |
4600 |
MAX - 9 |
4.2 |
4700 |
MAX - 9 |
3.0 |
4800 |
MAX - 6 |
2.0 |
4900 |
MAX |
2.4 |
5000 |
MAX |
0.4 |
5100 |
MAX |
-2.3 |
5200 |
MAX |
-4.4 |
5300 |
MAX |
-5.5 |
5400 |
MAX |
-5.0 |
5500 |
MAX |
-5.3 |
5600 |
MAX |
-4.7 |
5700 |
MAX |
-3.6 |
5800 |
MAX |
-3.2 |
5900 |
MAX |
-3.0 |
6000 |
MAX |
-2.6 |
Application Source Code
A detailed description of the superhet front end application app code is provided here: Super Heterodyne Front End