Avionics-List Digest Archive

Sun 11/11/07


Total Messages Posted: 2



Today's Message Index:
----------------------
 
     1. 12:12 AM - Re: Avionics-List Digest: 2 Msgs - 11/05/07 (DEAN PSIROPOULOS)
     2. 10:42 AM - Post Mortem - Matronics List Pummeled By Spam... (Matt Dralle)
 
 
 


Message 1


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    Time: 12:12:43 AM PST US
    From: "DEAN PSIROPOULOS" <dean.psiropoulos@verizon.net>
    Subject: RE: Avionics-List Digest: 2 Msgs - 11/05/07
    Functional checkout of my electrical system has gone well so far with no smoked wiring or equipment. I bought an equivalent of an Odyssey 680 a couple years ago and trickle charged it occasionally hoping it would at least be good enough to do electrical checkout, first engine start and maybe a few times around the pattern. But it appears that is not the case. Voltmeter says there is 12.5 volts at the terminals but it can't produce enough amps to fire the battery contactor or even make some sparks when shorted, pretty pathetic. I substituted a Panasonic 4.5 amp hour sealed lead acid battery that I bought second hand about 6 years ago. It's got enough oomph for the checkout but I'll need a new 680 for 1st engine start. I did a test on my magneto P-leads (one mag on left side, electronic on right side)with an ohm meter. Thinking that when the key switch is in the off position, the resistance across the p-lead should measure close to dead short and, it does. By the same logic, I thought that when the mag was ungrounded the resistance across the p-leads (I used a shielded wire with the shield grounded at the magneto through the key switch, no local grounding). But when I measured across the p-leads at the magneto the resistance only went from 0.2 ohms to 0.4 ohms when I turned the key. Not an appreciable increase in resistance but it was consistent (happens every time) and measurable. I thought maybe I had a faulty key switch but not so, I removed one p-lead from the mag and made the same measurement and the resistance with the key in that mag's position read infinite. I suspect that there is some thing about magnetos I don't know and that this is not a problem but would like to be sure. Anybody ever done this test? Did you get the same results? Also checked out the VM-1000 and it seems to work fine except for dimming. I used one of the B&C dimmers connected to the VM-1000 dimming input but I don't seem to get any dimming action (backlight works ok). Anyone else experience this? Have I missed something in the VM manual and it doesn't use an external dimming input? Any thoughts? Thanks. Dean RV-6A N197DM closer to 1st flight.


    Message 2


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    Time: 10:42:33 AM PST US
    From: Matt Dralle <dralle@matronics.com>
    Subject: Post Mortem - Matronics List Pummeled By Spam...
    Dear Listers, Over a 3-day period, Thursday 11/8 though Saturday 11/10, the Matronics Lists were pummeled with over 450,000 spam emails causing posting delays and a few duplicate messages. Yeah, I really said nearly half a million spams! The good news is that I don't believe a single one of them actually made it to the Lists thanks to the aggressive List filtering code and the Barracuda spam filter. The bad news was that it caused quite a back log of email messages starting Friday and continuing until late Saturday when I noticed that delivery seemed a bit sluggish. By about 11pm on Saturday night, I had managed to get the backlog cleared out of the spam filter by temporarily adjusting some of the filtering. A check of the queues this morning, and everything looks like its working great and there are no incoming filtering delays and spam levels appear to be back to "normal". There were a number of people asking what was going on, so I thought that I'd send out a follow up post mortem on the event... November is the annual List Fund Raiser. Your contribution directly enables me to buy systems like the Barracuda spam filter that keep the List free of that garbage. Please make a contribution to support your Lists! http://www.matronics.com/contribution Thank you! Matt Dralle Matronics Email List Administrator




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