As I understand it from a previous exchange on the ARC5 forum, CW was very seldomly used for communication.

Most was done by voice: AM in those days.

Sometimes, CW was used unofficially in bombers (B-17, etc.) to signal the home airfield that they were on their way back.

But this info is anecdotal, not official.

Ken W7EKB

Sent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone

-------- Original message --------

From: Mark K3MSB <[email protected]>

Date: 10/1/25 10:13 (GMT-08:00)

To: "Military Radio Collectors Association ([email protected])" <[email protected]>, ARC5 <[email protected]>, List Milsurplus <[email protected]>

Subject: [ARC5] SCR-287 (BC-375 & BC-348) WW II Operational Question

Hi Everyone

Was there any preference to the mode used during missions? I'm specifically referring to the time before bombers were equipped with the SCR-522.

I checked my books and did web searching, but was not able to find an answer. I find numerous references to HF frequencies used, but nothing that indicates voice or CW.

73 Mark K3MSB