[Milsurplus] "DFing ship receiver L.O." small additional fact?

[Hubert Miller]

Re the topic of "DFing radio receiver L.O.", here is an intriguing little tidbit i found while going thru some paper-

"Form 7999  2/40
Inventory Rough Notes - SS Mary D
Radio Room
........................
.............
Receiver RCA IP-501A  Sr. No. 397 & WW
Condemned by Navy                                                 1

Transmitter RCA  ET-8010  Ser. No. 3846              1
Auto Alarm  RCA  Mod. AR-8600  Sr.# 37702       1 "

end quote. That's all the communications equipment onboard!
I was unable to determine what kind of ship "Mary D" was - or why the Navy would be the authority to "condemn" the IP-501A.
And this date was near two years before U.S.A. entered the war.
I DO have paper to establish that Alaska Steamship Co. replaced the IP-501s in their ships with newer receivers - but not much
newer:  Sargent 10, and National SW-3, both regens. Perhaps because Alaska Steam was coastal, not sailing across either ocean,
they were allowed to keep receivers which were not on the "FCC Approved safe list."
-H M

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