Default Com1 settings

HI Guys i remember in fs9 that i edited the config file so every time i started fs Com1 would be set to 122.80 Unicom for Vatsim, I am trying to do the same with fsx but i cant seem to find where this setting is listed, i have searched the usual places like the config file in application data and the main folder but i cant find it. Does anyone know where i would find these settings?

Thanks in Advance
Mark

Revert to FS9... just Joking...everebody knows I dislike FSX ..sorry,could'nt resist
Have a great day and more appropriate answers