It is a lot of years LORAN was the big problem for HAMs
on reception of weak signals on 160м.
At http://www.internationalnavigation.org/jp100.html#Foreward
(~1.3MB) John A. Pierce has written in the memoirs abt Long Range
Navigation system (LORAN) and why it has appeared on TOP's range.
In Chapter 13 (p 165) his wrote:
"Because the war had made it necessary to forbid amateur radio
operation, we found it convenient to make a further move into the
former amateur "160-meter band" where Loran remained for many years."
John Alvin Pierce(1907-1996) is generally credited as being the father
of LORAN (and, for that matter, VLF's OMEGA) in the United States.
He had amateur radio license in 1923-27 (but I have not found
J.Pierce's callsign). See Chapter 3 (p 22)
J.Pierce was in the Soviet Union. In 1936 John Pierce had first(?)
DXpedition to Soviet Union's republic Kazakhstan at Ak-Bulak (now UN)
- callsign was URAD (under the Eclipse Expedition - see Chapter 7)
73! Ed RU6LA ed@dx.ru http://136.73.ru
P.S. As has informed Vlad UA6LV, propagation was bad to NA - he has after
the first night only 4 US's mults in CQ WW 160
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