Quantic PMI Model PFS-1G20G is a frequency synthesizer that operates over the 1 to 20 GHz frequency range using RS232 input controls and a 10 MHz reference signal. This unit features high tuning speed of 50 ms; frequency accuracy and stability of ±2x10^-7 (or same as External Ref), output power of 10 dBm minimum, and low phase noise. Housing measures 4.53" x 3.74" x 0.79" with a standard RS232 9-Pin female Micro-D connector and SMA female connectors.  https://www.quanticpmi.com/product-details/pfs-1g20g