[chbot] Chchrobotics Digest, Vol 141, Issue 4

[Andrew Errington]

How about a simpler headlamp that is just a battery and incandescent bulb?

Or one of these:
https://en.m.wikipedia.org/wiki/Carbide_lamp

:)

Andrew

On Wed, Jun 26, 2019, 12:45 Eliot Blennerhassett <ewblen at gmail.com> wrote:

> On 26/06/19 12:10 PM, Volker Kuhlmann wrote:
> > On Wed 26 Jun 2019 10:42:47 NZST +1200, Bevin Brett wrote:
> >
> >> How easy would it be to shield a normal commercial head lamp?
>
> Note the original question is to shield a *normal commercial* lamp.
>
> Worth trying the foil...
>
> Also worth taking the receiver into the shop and comparing what kind of
> wideband RF crap is coming out of different lamps?
>
>
> As others have noted, all sorts of ideas come up if designing your own.
>
> My thought: put the battery pack and switcher inside a metal box in your
> pack, with ferrite etc on the DC output cable...
>
>
> > That'll be the switchmode converters. Does the lamp as a whole meet
> > regulatory EMC requirements...? ;-)
> >
> > Replace down regulator with linear regulator and add a heat sink. If it
> > has an up regulator you'd have to change the battery configuration
> > first.
> >
> > But you could also try the alu foil / metal mesh idea. You'd have to go
> > right up to the LED and leave the smallest hole possible there.
>
> > Relate
> > any hole size to the wavelength you're trying to shield (bird
> > transmitter frequency).
>
> The frequency will be VHF (around 160MHz)
>
> Ref:
>
> http://www.sirtrack.co.nz/index.php/terrestrialmain/vhf/receiversantennas
>
> http://www.sirtrack.co.nz/index.php/avian/vhf/leg-band
>
> --
> Eliot
>
>
>
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