---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 09/06/13: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:51 AM - Transmitting causes transponder to turn off (Linda Walker) 2. 06:16 AM - Re: Transmitting causes transponder to turn off (Robert L. Nuckolls, III) 3. 08:43 AM - Re: Lightspeed Plasma III current curves (hotwheels) 4. 09:35 AM - Re: Lightspeed Plasma III current curves (jonlaury) 5. 10:20 AM - Re: Lightspeed Plasma III current curves (Peter Pengilly) 6. 08:48 PM - Re: Lightspeed Plasma III current curves (nuckollsr) ________________________________ Message 1 _____________________________________ Time: 01:51:52 AM PST US From: Linda Walker Subject: AeroElectric-List: Transmitting causes transponder to turn off Bob.=0AElectrical system architecture of our Long-EZ is based on the old Z- 13 of 11/01- (page Z-11) with a 60 amp B&C alternator and their 32 AH bat tery, sized for long overwater legs.=0AI have the Vision MicroSystems VM100 0 engine display that includes a voltmeter, which on recent examination is reading incorrectly.=0AI am about to do a test flight with a multimeter tem porarily in place to read what the VMS should be reading, and will report b ack.=0AThanks for your help.=0APatrick Elliott.=0AG-LGEZ=0A=0A=0A=0A=0A____ ____________________________=0A=0A________________________________- Messa ge 3- _____________________________________=0A=0A=0ATime: 06:51:17 AM PST US=0AFrom: "Robert L. Nuckolls, III" =0ASub ject: Re: AeroElectric-List: Transmitting causes transponder to turn- of f=0A=0A=0AAt 03:36 AM 9/5/2013, you wrote:=0A=0A>Bob.=0A>First time it has happened in almost 500 hours of operation.=0A>=0A>My initial thought was th at, as transmitting takes more power than =0A>just receiving, it might be c ausing a power transient in the shared bus.=0A>How would I check if this is the case?=0A>Patrick Elliott.=0A>G-LGEZ=0A=0A- - Can you describe the architecture of your electrical=0A- - system? Alternator and battery si zes . . . what kind=0A- - of airplane? Do you have a voltmeter in the a irplane=0A- - and are the reading(s) normal?=0A=0A- - The added loa d on a bus by the transmitter is a pittance=0A- - compared to the size of your alternator . . . there's=0A- - no rational reason for an 'overl oad' condition. If=0A- - it were an overloading situation, then turning on your=0A- - landing lights (assuming incandescent lamps) would=0A- - impose a transient many times greater on the bus . . .=0A- - but a transient that Garmin says is no big deal by=0A- - virtue of their DO- 160 qualification testing.=0A=0A=0A- Bob . . . ________________________________ Message 2 _____________________________________ Time: 06:16:49 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Transmitting causes transponder to turn off At 03:50 AM 9/6/2013, you wrote: >Bob. >Electrical system architecture of our Long-EZ is based on the old >Z-13 of 11/01 (page Z-11) with a 60 amp B&C alternator and their 32 >AH battery, sized for long overwater legs. >I have the Vision MicroSystems VM1000 engine display that includes a >voltmeter, which on recent examination is reading incorrectly. >I am about to do a test flight with a multimeter temporarily in >place to read what the VMS should be reading, and will report back. >Thanks for your help. >Patrick Elliott. >G-LGEZ Hmmmm . . . when one appliance 'talks' to another and induces it to unseemly behaviors, there is at least a suggestion of an architecture problem. In plastic airplanes, the potential for mischievous collaboration is doubled by the need for both power and GROUND busses. So far, the only reported incidents of xponder shutdown due to keying of the VHF comm have cited the Garmin products. I'm reluctant to believe that their due diligence to DO-160 compatibility failed . . . but it has happened. The fact that only one model of transponder has been cited for these occurrences is curious. Bob . . . ________________________________ Message 3 _____________________________________ Time: 08:43:28 AM PST US Subject: AeroElectric-List: Re: Lightspeed Plasma III current curves From: "hotwheels" I have dual LSE Plasma IIIs. Here are the current draw numbers Klaus shared recently for Box version "B". Your mileage may vary depending upon box vintage... Box on, engine off: ~0.2A Engine at idle power: ~0.8-0.9A Engine at cruise power: ~2A Regards, Jay N433RV RV-10 ... Flying! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=408157#408157 ________________________________ Message 4 _____________________________________ Time: 09:35:04 AM PST US Subject: AeroElectric-List: Re: Lightspeed Plasma III current curves From: "jonlaury" As Jay uses the singular "Box Version B". I assume the current draw would be double for dual LSE III's . Correct? John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=408160#408160 ________________________________ Message 5 _____________________________________ Time: 10:20:48 AM PST US From: Peter Pengilly Subject: Re: AeroElectric-List: Lightspeed Plasma III current curves ________________________________ Message 6 _____________________________________ Time: 08:48:54 PM PST US Subject: AeroElectric-List: Re: Lightspeed Plasma III current curves From: "nuckollsr" 2.0 at 'cruise' is consistent with the data taken assuming that you cruise at 2200 rpm and the electronics package is in a 75F ambient. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=408188#408188 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.