PAL is dead, replaced by DVB-T and it's latest improvement DVB-T2.
Presuming you use a Transformer that is rated at about TWICE the expected load (in Watts or Volt-Amps) to prevent overheating, they will successfully convert voltage levels from about 220-240 VAC to about 115 VAC, but a much more expensive and much lower reliability INVERTER is required to convert 50 Hz to 60 Hz. Without an INVERTER, if you have any cooling fans in your HDTV or other equipment, they will run SLOW by 20-percent, thereby reducing the cooling design. This MAY cause a cooing problem not only in the equipment, but also in the Fan itself.
The biggest problem using US ONLY electronic equipment is the inability of MOST US equipments to accept 25 and 50 Hz frame rate signals on Video, S-Video, Component Video and HDMI Interaces, such as from Euro SAT, OTA (aka DTT), Cable, PAL compatible DVR's bought in Europe and other sources.
If you are moving into US Military Housing, they may provide access to the AFRTS system, which is compatible with US equipment [HD is still a future upgrade].
Otherwise, you should buy a UNIVERSAL HDTV either before you go or when you get there, whichever is more convenient. The built-in DVB-T (and perhaps also DVB-T2) feature will permit trying to receive (and eventually understand) local broadcasts.
A LOT more on this subject can be found in this thread and the referenced thread re similar question for moving to Australia: