THE 3600A SOLD. DSI MODEL 3700. SERIAL #45034 UNIT CAME IN A BOX WITH A MANUAL.SPEC'S 50hZ. TO 60mHZ. COAX INPUT.30mHz. TO 700mHz. COAX INPUT.COMES WITH AC ADAPTER.UNIT IS NOT JUNK--IT IS IN VERY GOOD CONDITION/ASKING $35. IF INTERESTED PLEASE CONTACT DON K2DSVTEL#732-356-8195 OR k2dvs at msn.com THANK YOU AND VRI BEST 73 ES GUD DX.