[Milsurplus] Re: RAL

[Bob W7AVK]

Clete - You are correct.  All ships had 500 khz emergency receiver most 
of which were nothing more than a crystal set.  Being a crystal 
dectector couldn't receive CW or A1 mode that was the reason all 500 khz 
emergency transmitters had an A2 mode or a modulated tone that was keyed.

73  Bob  W7AVK



C Whitaker wrote:

> de WB2CPN
> 
> I do know that up until about the middle of WWII the
> ships at sea were required to carry a crystal detector
> emergency receiver for 500 KHz I think.  Maybe later.
> Per International Agreements and Treaties.
> 
> 73  Clete
> 
> 
> 
> 
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