Nope, you're going to need to dig a little - those 'wierd noises' you heard might be ALE. There are packages available to decode this - PC-ALE and MultiPSK being but two of them. This article has some links..,
ALE - The RadioReference Wiki
One thing ALE does very well is that it assists an operator in finding an optimum HF frequency in a path. Unfortunately we as hobby folks don't have access to that algorithm (AFAIK), so you need to check each frequency, wait for a squawk and see if an operator connects.
That is only one posssibility, of course...
best regards..Mike
