[Milsurplus] Fwd: HFDFing U Boats

[boeing377 at aol.com]

Sent from my iPhone

Begin forwarded message:

> From: boeing377 at aol.com
> Date: February 27, 2009 4:00:20 PM PST
> To: ampop at comcast.net
> Subject: Re: [Milsurplus] HFDFing U Boats
>

> Bob,
>
> He died in the late 70s unfortunately. He did say not once during  
> all of WW 2 did he hear U Boats use voice comms, it was all CW. He  
> knew Morse and was very radio savvy. He said the messages were not  
> plain text German but some kind of encrypted code. DFing on CW was  
> tougher than a constant carrier but they did get some decent nulls.  
> Skywave bearings were useless but they got plenty of ground wave  
> shots when U Boats were operating in the area. The U Boats were  
> generally too far away or their signals too weak to give a razor  
> sharp azimuth null but by averaging they got decent useful DF  
> bearings. He got reports that their HFDF work definitely resulted in  
> some U Boat sinkings. He was very proud of that. He said just  
> knowing that U Boats were active in the area was important  
> intelligence even if they were not able to sink them. They could  
> also get a rough count of tranmsmitting U Boats if they got  
> significantly different bearings in a short period of time that  
> would rule out one boat making all the transmissions.
>
> You can post this if you wish. Maybe some others with U Boat related  
> HFDF knowledge will respond.
>
> 73,
> AF6IM
> Mark
>
>
> -----Original Message-----
> From: ampop at comcast.net
> To: boeing377 at aol.com
> Cc: ampop at comcast.net
> Sent: Fri, 27 Feb 2009 3:42 pm
> Subject: Re: [Milsurplus] HFDFing U Boats
>
> Hi and your info really sounds interesting. Hopefully he is still  
> around - if so, could you ask him what type
> of modulation the U-boats employed??  Maybe the term "type of  
> keying" employed would be better.
> Thanks in advance, BobW, Odenton,Md
>
> ----- Original Message -----
> From: boeing377 at aol.com
> To: Milsurplus at mailman.qth.net
> Sent: Friday, February 27, 2009 12:42:51 PM GMT -05:00 US/Canada  
> Eastern
> Subject: [Milsurplus] HFDFing U Boats
>
> My ex's father commanded a US Navy HFDF station in Natal Brazil  
> during WW 2. He?said they had good success in taking bearings on U  
> Boats that would surface to communicate. The bearings were  
> approximate but gave enough info for aircraft and surface craft to  
> search for and sometimes find and sink U Boats in the area. I had no  
> idea that there was sea combat around Brazil in WW 2 but I read up  
> on it and there was due to the large amounts of strategic raw  
> materials shipped out from there.
>
> AF6IM
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