[ARC5] Relays

[kgordon2006 at frontier.com]

On 12 Oct 2025 at 17:46, ac2eu--- via ARC5 wrote:


> They look similar , but I think the coil resistance ( 40 ohms) is too low for 24V

That could me, all right. According to my calculations, they would require 600 mA at 24 VDC, 
which would be 14 watts.

At 6 VDC, that would be 150 mA, which seems more reasonable, and 0.9 watts.

But even that seems high for a relay.

I suppose we could compare those figures with other relays...

Might anyone know the specs for the relays that are in the ARC-5 transmitters?

Maybe Mark could measure the coil-resistance of the selector relay in one of his transmitters.

Ken W7EKB

> 
> On Sunday, October 12, 2025 at 12:32:32 PM EDT, <arc5 at ix.netcom.com> wrote:
> 
> 
>     Channel select for the "ARC-5"
>     VHF sets, IIRC
> 
>     Sent from EarthLink Mobile mail
> 
>     On 10/11/25, 11:59AM, Mark K3MSB <mark.k3msb at gmail.com> wrote:
> 
>     Reposting with a subject......
> 
>     On Sat, Oct 11, 2025 at 12:59PM 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.
> 
> 
> 
> Any ideas?
> 
> Mark K3MSB
> 
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