If you have SSB (or CW) capability on the VHF/UHF bands (like all of those IC706, IC7000, FT857, HF+6m, etc radios out there), contest weekends are the time to get on the air and give it a shot. V/U "weak signal" work is frustrating to a lot of amateurs, it's a much different scene than HF. Lots of listening to static and waiting for band openings... but on contest weekends there are a lot more people on the air so more "local" contacts are available as well as more traffic to be able to detect and exploit available propagation enhancements when they happen.
September is typically less productive for enhancements than the June contest but still a good time to be on the air.
For those new to V/U weak signal work... most all of this is done with
horizontally polarized antennas, whereas most FM work is done with vertical. Signal losses from polarization mismatch can be severe, on the order of 20dB. Polarization is less of an issue if you happen to be dealing with a propagation mode that alters polarization like E layer ionospheric skip. 6m especially is available in many HF rigs nowadays and even a simple dipole cut to freq will get you on the air on 6m and can yield amazing results during band openings.
Calling frequencies for VHF/UHF SSB:
6 meters - 50.125, spreading up the band as conditions/traffic warrant... rare for folks to get above 50.200 though. 50.100 - 50.125 is the "DX window", reserved for long distance international/intercontinental contacts so don't go down from 50.125 for general traffic - but if you're hearing the Caribbean, Hawaii, etc by all means respond.
2 meters - 144.200, once again going up in frequency as traffic warrants, although this is less common on 2m than 6.
1.25m/222MHz - 222.100, and congrats on having an all mode rig for this band. Hard to come by these day other than transverters.
70cm/432MHz - 432.100, very rare to have enough traffic to warrant moving up.
If you have 902 or higher equipment, you likely don't need my info to know what to do
If you only have FM capability:
You can still get on the air and have some fun, and maybe help out some of the competitive contest stations. Many contest stations have FM (with vertical polarization) for "local" contacts, and points are points after all. Contacts will be on the typical FM simplex frequencies with one notable exception - the common 2m simplex frequency is specifically disallowed for contest contacts, so do not use 146.520 for the contest. Try the following on FM:
52.525
146.550
223.500
446.000
The contest exchange is callsign and "
grid square". Grid square is the 4 character coordinate designation for what 1°x2° lat/long area you are in based on the Maidenhead coordinate system. If you don't know what grid you are in or how to find out, try this link ->
http://www.qrz.com/gridfinder. Note that the link will give you a 6 character location, for contest exchange you just use the first 4 characters, such as "EN86".
http://www.icomamerica.com/en/downloads/DownloadDetails.aspx?Document=415 is a grid map of CONUS in .pdf file form. Please brush up on your phonetic alphabet if you're not accustomed to using it. If you are calling CQ it's best to include your grid and/or general location (state, part of state) so that other stations can rotate beams toward you.
As a final note, the characteristics of VHF/UHF are such that one of the greatest operating aids is PATIENCE... such that you just leave the radio on, maybe give a CQ once or twice an hour... and listen. If you're driving, or around the house or whatever, just leave stuff turned on and listening to the calling frequencies. The best chance for enhanced conditions are mornings and late evenings, but can happen any time... and some of the best really long range E skip can be in the afternoons. At some point, out of the static or silence, will emerge voices...