As I think I understand it, JT65 and it's varients are all very slowly modulated which makes the waveform extremely robust. ALC, noise, flutter, Doppler shift and intersymbol interference all have a very tough time making much of an impact on such an incredibly rugged signal as JT65.
But this also makes this mode slower than molasses in January!!!! Rick - KH2DF Sent from my iPhone On Feb 18, 2010, at 5:25 AM, Andy obrien <[email protected]> wrote: but.. I think the original question also asked about modes other than PSK31, what about them? JT65A, for example is not a mode that once has to watch ALC so much. Does anyone have a good easy to understand description of why ? Andy On Wed, Feb 17, 2010 at 8:42 PM, DANNY DOUGLAS <[email protected]> wrote: To bypass all the technical stuff: just listen to the PSK bands and watch for single stations which show up across the waterfall in numerous places. In most cases, it is because they are sending with too much power. Ask them to decrease power, and the extra upper/lower signals just disappear. Sometimes its difficult to figure outw here they are listening, due to so many strong signals from the same station. Like any other mode, one should always start out with the lowest possible signal, and if they dont answer, increase it a few watts and try try again. We are supposed to use the least power needed for a contact. Thats part of the Amateur operators code, isnt it?
