Mike Everette, in his excellent analysis of the radio equipment on board NR16020, points out that AE's receiver was a Western Electric Model 20B.
The designed tuning range was divided into four bands: Band 1, 188-420KHz ; Band 2, 550 - 1550 KHz; band 3, 1500 - 4000 KHz; and Band 4, 4000 - 10000KHz.
However, as Mike notes, the Band 2 tuning range of AE's
receiver was factory modified to cover 485 - 1200 KHz, to accommodate her
original requirement for 500 KHz operation.
cites a 1939 source (Howard K. Morgan, Aircraft Radio and Electrical Equipment, Pitman Publishing Corporation
, New York and Chicago, 1939) which lists a Western Electric receiver model 20BA with band 2 covering 485 - 1200 KHz.
suggests that Earhart's equipment
may have been the prototype for the 20BA.
Duh. I had forgotten that Mike
had come up with that.
This stuff is getting ahead of me.