Hi Peter, I usually supply a 3.560 MHz crystal with the 455 kHz SoftRock Lite kit which results in a center frequency of about 444 kHz when divided by 8. Another crystal I have supplied is 1.843 MHz which results in a center frequency of about 460 kHz when divided by 4.
73, Tony KB9YIG ----- Original Message ----- From: Peter To: [email protected] Sent: Monday, June 09, 2008 9:52 PM Subject: [softrock40] Softrock Lite 455 IF Hi Tony, With the 455Khz IF version, exactly what is the crystal frequency? I ask this as the IF is usually a lot narrower than the direct receive varieties and it would be preferential if it was to one side so that one does not have the potential problems around the centre frequency. A 1.820Mhz xtal centres the bandwidth yet a 1.780 or 1.860 Mhz xtal would provide the offset to give the 20Khz coverage outside the "zero" point. Or have I missed something? Peter
