[ARC5] One use of light gun at airfield

[MARK DORNEY]

Once established, airfield frequencies did not change. Both German and Japanese subs had DF gear onboard. Any transmission from the airfield could be easily detected, especially if being done on a well known, established frequency and non-moving transmitter, and the DF gear would enable said enemy vessel to figure out the back azimuth to the transmitting antenna ( a known location ). The enemy could thus use the station as an aid to their navigation. Keeping radio transmissions short to non-existent is part of standard SIGSEC. 

Mark D. 
WW2RDO

“In matters of style, float with the current. In matters of Principle, stand like a rock. “.   -   Thomas Jefferson 

Sent from my iPhone

> On Jan 17, 2023, at 11:09 PM, Hubert Miller <Kargo_cult at msn.com> wrote:
> 
> Here is something that kind of puzzles me. Every long flight in any aircraft was provided with a list of frequencies of navigation aids
> and airfield frequencies. But here is a C-47 coming in to Panama Canal Zone field, and the pilot uses a light gun to signal. Was this 
> from some misguided fear of enemies listening? 
> -Hue Miller 
> <Use of signal light - cropped.jpg>
> ______________________________________________________________
> ARC5 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/arc5
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:ARC5 at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: https://www.qsl.net/donate.html