Joachim's Ham-Radio and Radio-Frequency Blog (A Solderful of Secrets) - from Longwave to Microwaves
Tuesday, November 24, 2009
XTAL filter for the grabber RX
Here is a spectrum to demonstrate the effectiveness of the single crystal filter employed in the 30m QRSS band d.c.-receiver. The filter is tunable by means of a trimmer capacitor.