Open HF SDR

Specs

• 0.5-30 MHz input freq range

Receiver

First stage

• 30 MHz low-pass filter
• Programmable auttenator with 10, 20, and 30 dB options
• Highly linear mixer to 37.224 MHz IF

Second stage

• IF filter for 37.224 MHz
• IF amplifier
• Mixer to 9 MHz IF

Third stage

• IF filter for 9 MHz IF with 0.5 MHz bandwidth
• Diff amp to ADC

Fourth stage

• ADC with 8 MSps, undersampling the 9 MHz IF to 1 MHz