The recording is interesting. This recording does show AM stereo's capabilities, but I have heard better audio from receivers using a wider bandwidth, and of course this recording is getting some adjacent channel interference as well which would make a wider bandwidth less effective. While long distance stereo here in the United States was fun, its most useful application in my opinion was on strong and medium strength AM signals during the day where a wider bandwith is practical. That could really sound pretty good.
How AM stereo is handled when a signal is weaker is really a function of the receiver being used. I found that less noise was added when a weak AM signal was in stereo than was the case with a weaker FM signal. Fading also affected the stereo image as was shown in this recording. Both the Sony Walkman style radio and my Carver tuner went into stereo at very low signal levels. In my experience here in the US, I cannot say that AM stereo caused additional interference. Stations that used a wider bandwidth for greater fidelity would, of course, cause more interference, and there was a tendency for AM stereo stations to want increased fidelity as well, but I didn't notice more interference from the stereo process itself, nothing like HD radio now. It is interesting that AM stereo is still being used in some areas. Best regards, Steve Jacobson On Wed, 09 Apr 2014 10:49:05 +0100, Colin Howard wrote: >Dane, >I note nobody has come back on the DropBox link I posted, details below: >https://dl.dropboxusercontent.com/u/7644179/A.%20M.%20stereo.zip >file name: A. M. stereo.zip >I would have thought somebody must have heard this, so why no comments? >I am interested to know what happens when a little out of the strongest >signal area? Does the stereo switch on and off with different signal >strengths mostly due to fading? >What is the lowest useable frequency? Did anybody try stereo a.m on long >wave? >Just a few thoughts.
