[Milsurplus] Question ( RBS; submarine )

Ray Fantini RAFANTINI at salisbury.edu
Thu Aug 25 10:31:54 EDT 2016


Can anyone anywhere document just one example of active LO direction finding in use by any Navy in WW2? , I am not talking about DF operations in fixing locations of submarines or surface craft by receiving low to medium powered CW or AM transmissions, or the practice of receiving radar emissions to identify frequencies and pulse rates but the alleged practice of attempting to receive the LO of a receiver at any distance beyond a hundred feet. 
I am not that up on the Navy stuff and do know that the US Navy operated shore base DF operations using things like the huge DAB receivers and very good shipboard DAK along with all the RN "Huf-Duf" equipment but cannot see any of that hardware being up to such a task.  Looking at the Graphic Survey of Radio and Radar Equipment, countermeasures equipment   (Y-109829) the army best receiver that would be up to the challenge would be something like the AN/ARR-5 or the AN/ARR-7 being they were state of the art for that function in 45 and with three to five microvolt sensitivity and often short antennas cannot see them hearing another radios LO unless it was next to them on the ramp.
With today's technology it would be difficult if not imposable to DF an offensive LO at any distance beyond line of sight, just spend time tracking down incidental radiators in your own house and see how easy that is.

Ray F/KA3EKH

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of mstangelo at comcast.net
Sent: Thursday, August 25, 2016 9:17 AM
To: Meir WF2U <wf2u at ws19ops.com>
Cc: Military Surplus List <milsurplus at mailman.qth.net>
Subject: Re: [Milsurplus] Question ( RBS; submarine )

Didn't the allies hype detection by DF-ing to hide the fact they were finding submarines by message interception and decryption and detection by Microwave RADAR?

Mike N2MS


----- Original Message -----
From: Meir WF2U <wf2u at ws19ops.com>
To: Bill KA8VIT <ka8vit at ka8vit.com>, Hubert Miller <kargo_cult at msn.com>, Military Surplus List <milsurplus at mailman.qth.net>
Sent: Wed, 24 Aug 2016 14:34:00 -0000 (UTC)
Subject: Re: [Milsurplus] Question ( RBS; submarine )

The DF-ing of receiver radiation is basically an urban myth. The radiated RF is miniscule and the DF receiver would have to be at a fairly close proximity to the reradiating receiver, which will put it at visual range anyway. The real reason is that in  shipboard radio operaton there were usually multiple receivers connected to the same receiving antenna, and the mutual interference from the same ship's receivers would be intolerable, especially when some receivers would be used for SIGINT and COMINT to search for and listen to enemy communications and other RF signals.

73, Meir WF2U
Landrum, SC

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