The sensitivity of an IC to it's environment, depends on SYSTEM design and
not on the IC itself. Otherwise we would not have Satellites, Deep Space
Probes or a Space Shuttle today.
You need to revise your architecture for the relay subsystem
and this includes Mechanical as well as Electrical and Environmental
Specifications.
Alex
===================================
If we can accept the notion that GUNS are
the killers and not the people, why is it that
we can not accept the idea that CARS are
the speeders and not the drivers?
Alex, trying to understand the world around.
==================================.
----- Original Message -----
From: "Pete Smith" <n4zr@contesting.com>
To: "TowerTalk Reflector" <towertalk@contesting.com>
Sent: Sunday, December 23, 2001 5:07 PM
Subject: RE: [TowerTalk] Decoding BCD with passive circuit (more)
>
> At 12:37 PM 12/23/01 -0600, Dale L Martin wrote:
> >
> >
> >try http://www.sandlabs.com/answers.htm
> >(verified as good before transmission of this note.)
>
> Yes, but there was a reason I specified passive decoding -- I don't want
to
> have to power an IC or individual gates at the tower, nor do I want to
have
> to protect them against static electricity/lightning EMP.
>
> In retrospect, maybe I need to explain better. I want a system that will
> fail operational in the event that all power to the relay box is lost.
But
> the real issue is the fragility of the IC in that environment. Both of
> these reasons disqualify use of a decoder IC, as far as I can see.
>
> 73, Pete N4ZR
>
> The revised World Contest
> Station Database
> is online at www.pvrc.org
>
>
>
>
>
> AN Wireless Self Supporting Towers are now available! Windloading tables,
> foundation diagrams and charts, along with full details are now at the
> AN Wireless Web site: http://www.ANWireless.com
>
> -----
> FAQ on WWW: http://www.contesting.com/FAQ/towertalk
> Submissions: towertalk@contesting.com
> Administrative requests: towertalk-REQUEST@contesting.com
> Problems: owner-towertalk@contesting.com
>
AN Wireless Self Supporting Towers are now available! Windloading tables,
foundation diagrams and charts, along with full details are now at the
AN Wireless Web site: http://www.ANWireless.com
-----
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
|