[ARC5] [Milsurplus] DAG HFDF Sense Antenna.

[MICHAEL BITTNER]

I don't know if this adds anything to the discussion, but remember the BC-611 DF antenna attachment solves the ambiguity question by using the soldier himself as the sense antenna.  The vertical antenna on the BC-611 remains collapsed, but the soldier puts his thumb on a metallic button on the handle of the DF loop antenna that connects him to the circuitry inside the handle.  Mike, W6MAB

> On April 2, 2021 at 8:34 AM Mike Feher <n4fs at eozinc.com> wrote:
> 
> 
>     Hi Mike –
> 
>      
> 
>     Of course, I appreciate and understand the need for the sense antenna. I suppose two of these separated by considerable difference (depending on resolution required) and with comms between the two, the ambiguity could be resolved. In one direction they would converge to the location while in the other diverge forever. Hope all is well with you. Thanks &73 – Mike
> 
>      
> 
>     Mike B. Feher, N4FS
> 
>     89 Arnold Blvd.
> 
>     Howell NJ 07731
> 
>     848-245-9115
> 
>      
> 
>     From: milsurplus-bounces at mailman.qth.net <milsurplus-bounces at mailman.qth.net> On Behalf Of Michael Hanz
>     Sent: Friday, April 2, 2021 8:00 AM
>     To: Mike Feher <n4fs at eozinc.com>; 'David Stinson' <arc5 at ix.netcom.com>; 'milsurplus at mailman' <milsurplus at mailman.qth.net>; 'ARC-5' <arc5 at mailman.qth.net>
>     Subject: Re: [Milsurplus] [ARC5] DAG HFDF Sense Antenna.
> 
>      
> 
>     I can't answer the ambiguity question as posed, Mike, but the need for a sense antenna is well documented back in the early 1930s, perhaps even earlier.  That and other considerations are described at https://aafradio.org/docs/1936_NRL_Aircraft_Radio_Training_Manual_DF_Chapter.pdf  (page 107 begins the sense antenna discussion).
> 
>     - Mike  KC4TOS
> 
>     On 4/1/2021 10:56 PM, Mike Feher wrote:
> 
>         > > 
> >         I have never seen a DAG till I saw your request below. Sure is a neat receiver. I wonder if all of those early sets had no way to resolve the 180 degree ambiguity. 73 – Mike
> > 
> >          
> > 
> >         Mike B. Feher, N4FS
> > 
> >         89 Arnold Blvd.
> > 
> >         Howell NJ 07731
> > 
> >         848-245-9115
> > 
> >          
> > 
> >         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 David Stinson
> >         Sent: Thursday, April 1, 2021 10:25 PM
> >         To: milsurplus at mailman <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: [ARC5] DAG HFDF Sense Antenna.
> > 
> >          
> > 
> >         Does anyone have or know of this sense antenna?
> >         It is the only piece missing from my DAG.
> >         I would pay or trade well for it.
> > 
> >         TNX ES 73 DE Dave
> > 
> > 
> > 
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> >     > 
> 
> 
>     -- 
> 
>     Michael Hanz - KC4TOS
> 




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