Software defined radio v2
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This is a simple, cheap Software Defined Radio for receiving HF. Design in part by kj4bwr.
These directions are still being developed.
specs[edit]
- Receive only
- Band selected by changing crystal (center frequency) and band pass filter
- maximum frequency limited to ??
- output: headphones jack, line in ready
- input: antenna lead soldered on or BNC
Assembly instructions[edit]
- create circuit boards
- solder surface mount components on board
- solder through hole components
- solder jumpers
- assemble crystal and filter modules and insert on board
- install software
project files[edit]
Parts list[edit]
| R1,4,5 | 49.9 |
| R2 | 330 |
| R7,8 | 2.2k |
| R3,6 | 5.1k |
| C4,5,10,11,17 | 0.1u |
| C7,8,9 | 10n |
| C6,14,16 | 1u |
| C1,2 | 22p |
| C12,15 | 330p |
| C3 | 47u |
| D1,2 | 1N4148 |
| L1,2,3 | 33u |
| P2 | 4pin |
| K1 | Crystal |
| P3 | Power |
| P5 | RF IN |
| J1 | Jack |
| P1 | Switch |
| P7 | 74HC3306 |
| U1 | 74S74D |
| U2 | 74HS86 |
| U3 | 7805 |
| P4 | ICS512M |
| U4 | OPA2355 |
| U5 | upc1688 |