[aprssig] Timer Circuit Needed

['Scott Miller']

For what kind of weather station?  The OpenTracker 1m will do that on its
own - you can use it with a Dallas 1-wire or Peet Bros station, and when its
transmit interval comes around it'll power on the radio (with an optional
20-amp solid state switch), wait the specified time for the radio to come
up, transmit a packet, and turn it off again.  I ran a low-power solar
weather station on a 5-watt solar panel that way, transmitting every 5
minutes.

You could also just use it as a timer if you had another device connected to
the weather station - set the interval to 15 minutes and the power control
delay to 10 seconds.  That'd probably be overkill, though.

Scott
N1VG

> -----Original Message-----
> From: aprssig-bounces at lists.tapr.org 
> [mailto:aprssig-bounces at lists.tapr.org] On Behalf Of John
> Sent: Thursday, May 24, 2007 11:19 AM
> To: TAPR APRS Mailing List
> Subject: [aprssig] Timer Circuit Needed
> 
> I am in need of a schematic (or complete unit) for a timer 
> that will run 
> off +12v and pulse a relay every 15 mins. The relay should 
> stay on for 
> 10secs. I think it can be done with a dual 555, one for the 
> 15mins and 
> the other for10secs.
> Anyone got any ideas. I need this to turn on the TNC and 
> Transmitter for 
> a solar powered wx station I'm trying to build
> 
> Thanks
> 
> John
> 
> -- 
> John Mc Hugh, K4AG
> Coordinator for Amateur Radio  
> National Hurricane Center, WX4NHC
> Home page:- http://www.wx4nhc.org
> 
> 
> 
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