To create is to live

Now that the basic receiver is working, what do I want to add to consider the receiver ‘complete’ ? This is the current set-up :

The following things I would like to add:

• S-meter : shows the strength of the received signal. Based on AF signal
• CW filter : Multiple Feedback Band-Pass filter, 1 or 2 stages, centered around 750Hz
• Audio Amp – current the bench utility amp is used with a gain of 20 dB.
• Keypad – Add 3×4 Keypad much like the K-225 keypad as found in Lowe HF-255 receivers

An attenuation network is often used in devices like a (digital) voltmeter, in oscilloscopes, etc. It offers the possibility to expand the input range of the measurement tool and thus makes it more versatile. Usually the attenuation network is build with a couple of resistor as shown in fig. 1. If the input resistance of the rest of devices is considered indefinite (as for example with a J-FET) the voltage is V_o=V_i*R₁/(R₁+R₂). This works very well with DC-voltages.