Received-SPF: pass
 receiver=logan.com; client-ip=205.152.59.68; envelope-from=atlasyts@bellsouth.net
From: <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Power source isolation
Date: Wed, 18 Apr 2007 9:09:41 -0500
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Message-Id: <20070418140941.KXMQ27044.ibm64aec.bellsouth.net@mail.bellsouth.net>

Al, I have seen it happen before. No big deal. 
Buly
> 
> From: "Al Gietzen" <ALVentures@cox.net>
> Date: 2007/04/18 Wed AM 09:44:45 EST
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Power source isolation
> 
> I find it a bit curious that the posting below that I sent on Sunday didn't
> get posted until Tuesday.  Do you suppose it was intercepted and reviewed by
> the 'internet police'; because there are/were a few words in there which
> might have attracted attention?  All my other e-mails have been going in a
> timely manner.  Anyone notice e-mails delayed on this list?
> 
>  
> 
> Al (slightly paranoid)
> 
>  
> 
> Joe;
> 
>  
> 
> We are still trying to resolve the settings [delete] issue, and have added a
> number of additional filters on the board, the effectiveness of which is yet
> to be proven.  Regarding the isolation diodes, I also have Schottky diodes
> between the batteries and the 'hot' bus that feeds the injector and the coil
> power to prevent a failure in one battery circuit from affecting the other.
> It may be that noise propagated in these circuits being isolated from the
> battery is a more likely an issue than isolation of the power feeds to the
> EC2.
> 
>  
> 
> The reality is that after putting filters at the coils to [delete] spikes
> coming back from there, we do not see any noise levels on any pins expected
> to be of concern.  But since the problem still existed we assume that there
> are some spikes at times we didn't observe; and in studying the circuits,
> and what is different in my setup than others; we are speculating that the
> isolation diodes could exacerbate the issue.  More will be known in a couple
> of weeks I as get some other changes/fixes completed, and get back in the
> air.  After a few low-power engine runs since the addition of the filters,
> there has been no changes of settings noted so far.
> 
>  
> 
> Al
> 
> 
>