Perhaps said frequeny(ies) and/or system(s) isn't (aren't) terribly busy? Knowing who the licensees are, if traffic is encrypted, hours of operation, etc will prove to be beneficial to you. There have been times I've dwelt on frequencies trying to pinpoint a licensee for hours, maybe a day before activity was heard. Your RR premium subscription allows you to do a
query search of the database. Search each frequency you come upon to see if it has been ID'ed in the RRDB. If not, assuming you're located in the USA you can also do an
FCC data search to try and narrow licenses down and reveal additional frequencies on the license you can plug in & check for similar activity. If you remain on frequency (channel hold) after a period of time the repeater may ID its callsign & this is when it pays to know some morse code (at least know the numbers). If you can pick up the trailing digits (usually 3) this can help you nail down the license. Note: you won't hear callsign IDs if you have the frequency(ies) programmed as OFT nor MotoTRBO trunked system, you'll need to be held on the frequency via custom or quick search (press CHANNEL, plug frequency in, press CHANNEL again) although not every repeater IDs itself
