[GreenKeys] RTTY in WW-II

[Jim Haynes]

It seems like both audio and IF type converters were used.  The AN/FGC-1
and the ones in the Press Wireless article use audio frequency, as does
the one in the AACS article.  But there are plenty of examples of IF types
as well, especially the Navy units.

Certainly the BFO adds another source of drift.  I've seen a SP-600
receiver that had external inputs for the main oscillator and also fo
the BFO.


jhhaynes at earthlink dot net