I am using a HMC832 EVB and I am using the Hittite supplied gui for this eval board. I am using a 80MHz source from the an external signal source. I am trying to lock the frequency at 2509.9MHz, however the LO is not locked (please see the registers that the GUI generated for this frequency).
However under the same circumstances the LO locks at 2605.9MHz, (see the attached file)
I can't see what is wrong with the setting for 2509.9MHz , the attached register settings are both generated by the GUI.