Function:

Provide product detection for CW / SSB; includes BFO

Input/Output:

• POWER: 9-15 VDC, 5.5 x 2.5mm power jack
• IF IN: 200 ohms, RCA Jack
• AF OUT: Zo=200 ohms max, RCA Jack

Operator Controls:

• BFO Frequency Adjust (may be a screwdriver trim)

Key Specs or Limitations:

• Frequency: To be determined
• IF-to-Audio Voltage Gain: 10- 15 db (fixed)
• Use crystals specified for 20 pf load capacitance

Misc Notes:

1. This stage not used in direct-conversion receiver
2. If an active mixer is used (like the NE602/SE612), an output amplifier will probably not be required; if a passive (diode ring) mixer is used, an AF output amplifier will be required. An amplifier, if used, should have low-pass roll-off to minimize hiss and eliminate IF feedthrough to the output.