[ARC5] [Milsurplus] DAG HFDF Sense Antenna.

[Bart Lee]

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

www.bartlee.com

{Bart(dot)Lee(dot)K6VK(at)gmail(dot)com}
<http://www.lawforhams.com/>



On Fri, Apr 2, 2021 at 4:38 PM Mike Feher <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 <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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