AM IF filter


Posted on Mar 18, 2013

Typical QRP receivers include Direct Conversion (DC) and simple Superheterodyne types. These receivers often have quite a wide AF bandwidth which can make inteligiblity somewhar restricted, especially under difficult QRM conditions. Many commercial amateur transcievers also suffer from this t.ex the Yaesu FT101B.


AM IF filter
Click here to download the full size of the above Circuit.

This is a simple filter that restricts the LF response a little as well providing quite a heavy HF roll-off. The prototype has enhanced a Yaesu FT101B that was only fitted with an AM IF filter. The IC is an LM358. Construction needs no detailed description. Layout is not critical.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Semiconductor-fail-alarm
High-Gain Current Sensor
SPI Interface Circuit for Big 7 Segment LED
Application of MSP430F149 one-chip computer in the target designator design
CAN bus line communication modular design of one-chip computer and MCP2510
15 volts power supply electronic circuit project using LT3512
VCO circuit
NE555 Timer
555 electronic circuit diagram of a Christmas tree
Radio circuit
Darlington phototransistor type light control switch circuit diagram sensitive application



Top