flyrotary@lancaironline.net Mailing List Archive

Hi Finn. Yes Plastic, so RFI often problematic. And yes I agree. Fix the source of the RFI if possible. Antenna is a dipole glassed into the fin so basically impossible to rectify or change the older coax to better RG400. I’m putting an antenna analyser on it today so hope to get VSWR etc. If its no good I might have to install a new antenna system. Wondering about: Iinternal - say a Bob Archer SA-006 or 008 at $180USD plus shipping to Australia External and installing a ground plane? In regard to Tracy’s fix. I haven't done any RFI decoupling, but I thought 10nF might be a better choice for 120Mhz? Thanks Finn. Steve On 11 Jan 2020, at 10:30 pm, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote: Steve, This is a composite airplane? Before starting to eliminate effects, I'd suggest you make sure that the transmitter, cables and antenna is not the cause. You're sure you have a real good coax - perfect shield/ground on both transmitter and antenna end? Good solid connector grounds -- no corrosion? How about grounding of transmitter (path to battery)? You could try a handheld transmitter for testing. In Tracy's fix, notice the period. It's 100nF not 1uF. Probably not that important but could slow the MAP sensor response. Finn On 1/10/2020 6:31 PM, Stephen Izett stephen.izett@gmail.com wrote: Hi people Ive had an opportunity yesterday to begin the journey of chasing down this miss in the engine / EC2 on radio TX. I discovered that the gremlin is getting into the EC2’s A computer but not the B Switching to B there is no hint of a problem. I’m thinking there are two substantive differences between EC2 A & B processors/computers. 1. The B computer has the capacity to turn off the leading and trailing coils for testing, that the A computer doesn’t have. 2. The A computer measures the intake air temp to determine O2 molecules in intake charge which the B computer doesn’t. So I’m wondering if the intake temp input (thermistor) on the EC2 A computer is the antenna for the RFI to get in. Disconnecting this line to the the EC2 A computer in order to identify if this is the problem is going to be a pain but maybe a necessary fault finding path. Has Tracy or anyone put a small Capacitor on inputs to filter RFI? Thanks for any input you can offer. Steve -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html