[MilCom] Questions from Pt. Mugu Programming / Airnav...

[b52hbuff at sbcglobal.net]

http://www.airnav.com/airport/KNTD
First question is what does it mean when a frequency is followed by an 'X'?  Like this....
    RDR:  120.75X 123.75X 133.25 233.7X 308.4X 

Next question, is this a common practice to have an RDR also be a clearance frequency?
CLEARANCE DELIVERY:  120.75 279.55 

And for those of you looking for the new military TRS in the 380-400MHz band, check this out:
PMSV METRO:  386.35