[aprssig] off the air

Dave dave at g8kbv.demon.co.uk
Fri Dec 30 15:26:25 EST 2011

Always best to have a "Crowbar" trip somewhere on the DC side, to make 
sure the fuse blows, also protecting the valuable rig (or whatever) from 
PSU troubles.  Shorted pass devices, are not uncommon.

Nothing's 100% garanteed of course.  There are commercial Crowbar 
modules, also specific controler chips for such needs too.  Just add 
passives and as huge a thyristor (and supply fuse) as you need.  
Correctly done, no false trips from RF either.

A "Next time" job I guess?


Dave G0WBX.

(It's a pity PC's don't fail "nicely", when a PSU dies.  I have recent 
first hand experience of that!)

On 29 Dec 2011 at 14:40, Stan Horzepa wrote:

> The WA1LOU APRS digipeater / weather station is off the air.
> A short in the DC power supply took out the 2-meter radio (Yaesu
> FT-1802). Why the fuse that was "protecting" the radio did not blow
> first is unknown.
> I don't have a spare 2-meter radio to replace the Yaesu, so WA1LOU
> will be missing from the network for the foreseeable future.

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