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945, good range, then bad range..

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Old 05-25-2004, 08:41 PM
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JohnVH
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Default 945, good range, then bad range..

Hello, got a 945 rx being run by a 10x, and I did my range checks and all was good. Then a couple hours later when it was time to maiden the bird, I went out and lined up on centerline, just like I did in my taxi tests, and it went it failsafe...

Since I changed nothing in the plane, what could be causing this? Ever heard of this before?

Thanks
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Old 05-26-2004, 02:21 PM
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Default RE: 945, good range, then bad range..

I haven't heard of that exactly. That sounds very odd. It could be outside interference on your channel, it could be model generated RF (bad connection extension somewhere, bad bearing in the engine, bad ignition on a gas plane, proximity of items to the engine/ignition, metal to metal contact, etc.) or antenna placement (particularly in a composite aircraft where the antenna needs to exit the model). Things possible to try would be to use another channel, check all extensions and connections for proper fit and that they function correctly (not intermitently), try routing the antenna in another way and be sure it is a good distance between it and any extensions and at a different angle, and I would also recommend adding a filter on the line between the switch and the receiver, the throttle servo and the receiver, and any extensions that are over 36". The filters are part number JRPA028 for a snap together style, and JRPA029 for a ring style. Please let us know if you have any further questions.
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Old 05-26-2004, 02:48 PM
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Default RE: 945, good range, then bad range..

OK, but the odd part, range is bad now engine running or not... and why did it range check great, then go to nothing? This is turbine powered.
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Old 05-26-2004, 03:39 PM
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Default RE: 945, good range, then bad range..

What model do you have? Is it composite? Many times with a turbine model a whip type antenna will work better and solve many problems, that is if you are not already using one.
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Old 05-26-2004, 04:26 PM
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Default RE: 945, good range, then bad range..

I have a whip in the nose of it already... Maybe I need one of those that stick outside the body? It is a composite airframe
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Old 05-27-2004, 09:24 AM
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Default RE: 945, good range, then bad range..

If it is a composite aircraft, and the antenna is inside, that is likely your problem. You'll need to get the antenna outside in some way.
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Old 05-27-2004, 10:02 AM
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Default RE: 945, good range, then bad range..

OK, Ill try it, odd it ranged checked fine before though...
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Old 05-27-2004, 02:59 PM
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Default RE: 945, good range, then bad range..

That is odd indeed, but odd things can happen in a composite turbine aircraft. Let us know what happens with the antenna outside the model.
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Old 05-27-2004, 11:46 PM
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Default RE: 945, good range, then bad range..

do you know where I can find an external antenna? I cant seem to find anyone selling them.
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Old 05-28-2004, 08:38 AM
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Default RE: 945, good range, then bad range..

There are several out there I believe, I have seen some available through Planes Plus ((630)904-5075) that I believe were available in various colors etc. I'm sure there are others out there as well.
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Old 05-28-2004, 09:12 AM
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Default RE: 945, good range, then bad range..

OK, Ill check into it, Thanks! The RX has a Revolution whip on it now.
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