He's measuring the resistance of the current limiting resistor (inside the
rotor housing) which is in series with the reed switch. This is typical of
a lightning strike event that welded the reed switch contacts closed.
On Thu, Jul 18, 2013 at 8:02 PM, Rick Karlquist <richard@karlquist.com>wrote:
> Jerry Gardner wrote:
>
> >> bench yet, I think I need to replace the reed switch. It is showing
> >> about
> >> 780 Ohms and will not show any pulses.
> >>
> >> TNX es 73, Fred KG9X
>
> I can't imagine any failure mechanism that would make a reed
> switch look like 780 ohms all the time. I suggest you investigate
> other possibilities like a bad cable, etc. If you told me it
> pulsed, but had a high resistance, I would try pulsing it with
> a high current like 100 mA to see if there was oxide on the contacts,
> etc.
>
> Rick N6RK
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|