gheinig

Hi corn_flake, I'd like to resurrect this thread, since I've run into the same problem after debugging numerous annoying little problems with my 1968 M20G, one of them being the continuous display of the "Elec off" flag on my Brittain turn coordinator, which still works fine, to my great surprise (found out it's vacuum-operated as well). As cctsurf wrote, it's a 3-phase signal with one of the 4 wires being ground. I had a closer look inside it and one of the components looks like it's a fuse. I'm going to test whether it's blown - I assume it is, since the 3-phase wires to the turn coordinator were twisted together and fixed with *very* old insulating tape, some of which had come off, probably causing a short-circuit somewhere. Have you managed to fix your problem since your post? Best regards from Germany, Gerald

Hi Terry, no, I'm referring to the Narco HSI-100 HSI. It's a simple, non-slaved device that, to my knowledge, cannot be used for autopilots (it has no heading bug). I've just looked up your Century NSD-1000; it looks quite nice. It's a slaved device, isn't it? What are you planning to do with it? Do you plan on selling it? The thing is, for Eur 2500 I can get a Garmin G5, so I'm a little hesitant to buy something that's older. Anyway, thanks for the tip! It's useful information in case the HSI-100 dies or I decide to install something else. Cheers, Gerald

Thanks

Hi Scott, you're quite right about not paying for interfacing to stone-age electronics; it doesn't make sense. That's why I'm having a stab at doing it myself. If I find out that the voltages are incompatible or that one box requires a 50 kHz input and the other expects 100 kHz, then I'm dropping the idea and installing a G5. But it's worth trying. It may just be that they *are* compatible and things Just Work (tm). That would be great and I'd save a packet.

Hi Brian, thanks for your answer. Just had to Google DGO 10, so it's a directional gyro. You said you 'found the plans' for the converter... where did you find them? I'd be interested in what that converter does, exactly, and why. I have a hunch that the HSI-100 works completely differently (than the DGO-10); the outputs from the GNS-430W "sort of" correspond to the inputs of the HSI, but only "sort of". Do you still have those plans floating around somewhere? Regards, Gerald

Hello, I recently installed a GNS-430W in my M-20G and I would like to connect it to the existing HSI, if at all possible. The HSI is a very old Narco HSI-100 but which still works fine, so before I fork out Eur. 2500 for a Garmin G5, I'd like to try and get this setup to work. I contacted Garmin UK to ask whether the GNS-430W could drive the HSI-100, but they couldn't say. Has anyone tried something similar with an HSI-100? I bought the Avionics Installation Handbook by Robert Horan (*great* book BTW) which has pinouts for the HSI-100 but doesn't explain how to connect up the rotor and stator connections for the resolver. Anyone have any ideas? Cheers, Gerald