BelargUSA,
I thought that was the case, but am I right in saying a call from 121.5 will be picked up on 243 as it is the 2nd harmonic, if I am what about a 243 call being picked up on 121.5 as it is the 1st sub harmonic. Suppose there might also be a problem on voice one might be standard modulation the other ssb , I don't know.
ta
isca-isca