[Milsurplus] BC-611 Operational Question

[Brooke Clarke]

Hi Mark:

The problem with the BC-611 is that the antenna (1 meter) is very short compared to a 1/4 wavelength (20 meters) so it's 
very inefficient.
When the operator is standing on the Earth (ground) there's some coupling from the radio metal box to the operator to 
the ground acting as a counterpoise.
But when the BC-611 is used from a parachute (without a wire counterpoise) the radiation efficiency will be extremely 
low.  This may explain the lack of contacts.
https://prc68.com/I/BC611.shtml

-- 
Have Fun,

Brooke Clarke, N6GCE, MSEE
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> Date: Wed, 2 Oct 2024 20:36:27 -0700
> From:boeing377 at gmail.com
> To: Facility 406<facility_406 at bruteforcedevelopment.com>
> Cc: List Milsurplus<milsurplus at mailman.qth.net>
> Subject: Re: [Milsurplus] BC-611 Operational Question
> Message-ID:
> 	<CAFZq+Ez4mb0vXw0hmxiX8SQV36tztto9jJ3NeUr_x3FY41HMFw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> I?m an EE and agree with your theoretical analysis but I tried many
> different antenna orientations during descent hoping to contact my friend
> on the DZ. No joy until I was about half a mile from him vertically.
>
> Mark
> AF6IM

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