Friday, October 23, 2009

New IF for the airband receiver

I changed the IF of the airband receiver, now is 10.7Mhz for the first conversion and 455Khz for the last one, that way I can now add an FM 10.7 IF to the circuit, being double conversion on AM an single on FM in order to optimize the Si570 kit (AM airband and FM 144Mhz), probably will make also an front end and IF for 50Mhz ssb.
The circuit is a simple NE602 with an 10.245Mhz cristal and the filter is an 10.7Mhz cristal front the first mixer to the secound mixer, case connected to ground and a paralel capacitor in the secound mixer input (pin 1 on the ne602).

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