I have a used Showa 9MHz 2.2KHz 500 ohm crystal filter for sale. Will include USB and LSB BFO crystals. Picture on request including VNA sweep of response. Price is $30 plus $5 shipping to US only. I take Paypal only. Loren Moline WA7SKT Benson, AZ DM41ux Admin:Facebook Group: Electronics Theory and Circuit Design.