It looks like I have to work in a location where there are two Shure PG1 wireless lavs in operation, and I can't seem to find what frequencies they are operating on. I downloaded the user guide from PG Wireless Systems - The entry to Shure professional wireless (http://www.shure.co.uk/products/wireless_system_configurations/pg_wireless) but it doesn't tell me what the actual frequencies are. I realise I can change all my own gear but would much prefer to know what these Shures are doing before I start messing about with any settings.

Is there a way to find out what the exact frequencies are? The receivers just say Ch1 and Ch2.

The last two characters of the model number should give you the frequency range.

Shure has a couple PDFs that give the actual frequencies for each range:

PG http://www.shure.com/ProAudio/TechLibrary/WirelessFrequencyCompatibilityCharts/ssLINK/wireless_CompatChart_PG_tp

PGX http://www.shure.com/ProAudio/TechLibrary/WirelessFrequencyCompatibilityCharts/ssLINK/wireless_compatibility_pgx

Just what I needed, Jordan! Thank you so much.
This is the one: