[Milsurplus] [ARC5] DAG HFDF Sense Antenna.

[Mike Feher]

Hi Bart – 

 

Sorry, cannot help you with that. 73 – Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

From: Bart Lee <bart.lee.k6vk at gmail.com> 
Sent: Saturday, April 3, 2021 12:20 AM
To: Mike Feher <n4fs at eozinc.com>
Cc: Hubert Miller <Kargo_cult at msn.com>; milsurplus at mailman <milsurplus at mailman.qth.net>; ARC-5 <arc5 at mailman.qth.net>
Subject: Re: [ARC5] [Milsurplus] DAG HFDF Sense Antenna.

 

Mike and all, do you have any idea where I can get a manual or schematic for the sonobuoy receiver (WW II ) ARR3, FM 55 +- MHz to 75 +- MHz ? The radio awaits tender loving care... 

 

73 de Bart, K6VK ##


-- -- 

Bart Lee, K6VK, CHRS Archivist & Fellow, AWA Fellow, ARRL Liaison

 

Texts only to: 415 902 7168 

 <http://www.bartlee.com/> www.bartlee.com 

 

{Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}

 

 

 

On Fri, Apr 2, 2021 at 4:38 PM Mike Feher <n4fs at eozinc.com <mailto:n4fs at eozinc.com> > wrote:

I worked on ASW (Anti-Submarine Warfare) systems from the late 60’s to the mid 80’s. We used a similar principle in the DIFAR sonobuoy system, where we had an omni sensor device and an E/W and N/S sensor. The Omni was used to resolve the ambiguity. Multiple buoys with statistical processing could give a very accurate bearing of a sub. This was a totally passive system. Looking at doppler, we could also estimate the CPA (Closest Point of Approach) and speed. This was depicted in the movie Red October. 73 – Mike  

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

-----Original Message-----
From: arc5-bounces at mailman.qth.net <mailto:arc5-bounces at mailman.qth.net>  <arc5-bounces at mailman.qth.net <mailto:arc5-bounces at mailman.qth.net> > On Behalf Of Hubert Miller
Sent: Friday, April 2, 2021 1:54 PM
To: milsurplus at mailman.qth.net <mailto:milsurplus at mailman.qth.net> ; ARC-5 <arc5 at mailman.qth.net <mailto:arc5 at mailman.qth.net> >
Subject: Re: [ARC5] [Milsurplus] DAG HFDF Sense Antenna.

 

> The 180 degree ambiguity is impossible to resolve without that sense antenna, BTW

 

Is this strictly true? If the loop is not balanced to ground, has one side grounded? 

Granted, the pattern may be less marked, but it does indicate directionality. 

I feel I vaguely recall  an actual commercial application of this fact. 

-Hue Miller 

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