[ARC5] [Milsurplus] Relays

[Nico van Dongen]

I have a set of six of these relays on a plate with tree crystals taken
from a BC-733 receiver that was used together with the ARN-5 receiver as an
ILS (instrument  landing system)
One is the glide path and the other is the localizer receiver.
I have two of these ILS systems, one is WW2 with six channels and the is
other post war where the system has been upgraded to 12 channels.
Of course these kind relais can be used on many other systems but in the
BC-733 for sure.

Nico - PA3ESA


Op za 11 okt 2025 om 23:25 schreef Michael Hanz <aaf-radio-1 at aafradio.org>:

> Hi Mark,
>
> Definitely ARC style relays.  The ceramic insulation is pretty
> distinctive.  Not sure of all their uses, but I have a crystal frequency
> selector hulk with ten of them arrayed behind the twenty crystal
> sockets.  One larger DPDT relay selects which bank of ten can get
> selected.  I suspect they're from a postwar ARC set, but I don't collect
> those.
>
> If anyone can use this assembly, let me know.
> - Mike KC4TOS
>
>
>
> On 10/11/2025 12:59 PM, Mark K3MSB wrote:
> > Reposting with a subject......
> >
> > On Sat, Oct 11, 2025 at 12:59 PM Mark K3MSB <mark.k3msb at gmail.com>
> wrote:
> >
> >     I have several of these ARC-5 (generically speaking) style relays
> >     and I've been unable to find out what they are used for.
> >
> >     They are numbered between 812 to 816.  I find nothing close in my
> >     SCR-274N or AN/ARC-5 manuals.
> >
> >     DC Coil resistance is 40 ohms.  SPST.
> >
> >     image.png
> >
> >     Any ideas?
> >
> >     Mark K3MSB
> >
> >
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> --
> Michael Hanz - KC4TOS
>
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