On 8/1 Dan KL7Y posted several paragraphs about listening for your
backscatter echo on 160m.
Professor Villard W6QYT (of the Stanford Univ EE dept) wrote an article for
QST on this subject. The title is Instantaneous Prediction of Radio
Transmission Paths, and is in the March 1952 issue.
Although the article focuses on 20m and the equipment shown in the article
is somewhat antiquated by today's standards, the theory behind backscatter
sounding discussed in the artilce is still valid.
BTW, while rummaging around for Villard's old article, I came across Bob
Hunsucker's HF Propagation Effects at High Latitudes article in the February
1967 issue of QST. He was KL7CYS at the time, and worked for the Institute
for Telecommunication Science and Aeronomy (the old Central Radio
Propagation Lab). It's an excellent discussion of the auroral zone,
non-great-circle paths, sporadic-E, irregularities, absorption, and
polar-cap effects. Stuff that most of us have to contend with when working EU.
If you're interested, both of these are good reading.
Carl K9LA
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