I will be showing an Xl Microwave XL Model 3401 Source Locking Millimeter Wave Frequency Counter at Huntsville Ham fest . It counts to 40 GHz and I have tested it to 20 GHz ( limit of my sig gen). I have locked YIG’s to 11 GHz and verified HPIB operation. It comes with a 5 to 11 YIG with internal driver. It has a precision output connector with an SMA adapter. An operational manual is included. Am asking $ 400.00 at fest. Bill Reed --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus