[ARC5] [Milsurplus] DAG HFDF Sense Antenna.

[Mike Feher]

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 <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; ARC-5 <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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