[Milsurplus] Question ( RBS; submarine )

[Peter Gottlieb]

Even if you can't DF the LO might indicate what frequencies you were listening to, and maybe your search techniques. It is best to give as little information as possible to the enemy. 


Peter

> On Aug 26, 2016, at 1:52 PM, Nick England <navy.radio at gmail.com> wrote:
> 
> Hi ray - I appreciate the compliments and your confidence in my web site :-)
> But DF is far from my area of interest or expertise and my 
> www.navy-radio.com/rcvrs/d-df.htm page is just a catch-all place for info I happen to come across. 
> 
> For anyone  seriously interested in the topic, check out "Abstracts of the Available Literature on Radio Direction Finding 1899-1965" at 
> http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=AD0800110 
> which has entries for 5,224 articles to keep you entertained....
> 
> My point was that NRL etc. were indeed concerned about the possibility of LO detection. When they designed the RAA, RAK, etc. in the 1930's they were worrying about what a very clever adversary *might* be able to do in the next 20 years. Predicting future technology is difficult and assuming the worst case sometimes makes good sense. 
> 
> From Gebhard's NRL history -
> "... which included the Models RAA, 10 to 1000 kHz (1936), RAK, 15 to 600 kHz (1939), RAL, 300 to 23,000 kHz (1939), and RBA, 15 to 600 kHz (1941). These receivers were NRL concepts. They included the NRL multiplexing technique and the shielding needed to prevent radiation of local-oscillator energy which could cause detection by an enemy through interception."
> 
> I'm just pushing back against what sometimes seems to be a narrative that this was all just a foolish concern and panicked over-reaction by ignorant engineers. It wasn't. Just because you are paranoid doesn't mean they aren't out to get you.
> 
> You can't judge what might have happened, by what did happen - without Enigma decrypts, jeep carriers, centimetric radar, etc. maybe more effort would have been put into super-sensitive DF. I certainly don't know.
> 
> Cheers,
> Nick England K4NYW
> www.navy-radio.com
> 
>> On Fri, Aug 26, 2016 at 12:04 PM, Ray Fantini <RAFANTINI at salisbury.edu> wrote:
>> The base of my argument is your web site.  I am not an expert on history or procurement but simply look at the listings, publications and items on line and seeing what’s listed on your web site (http://www.virhistory.com/navy/rcvrs/d-df.htm ).  What I consider to be the premier web page for US Navy communications and looking at the DAK, DAQ and the shore base DAB don’t see anything up to that challenge.
>> 
>> If it existed I would think it would be evident in some publication and on your web site.
>> 
>>  
>> 
>> Ray F/KA3EKH
>> 
>>  
>> 
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