Thread: Discussion fms easy trainer 1280mm
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Old Jul 31, 2012, 07:59 PM
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Originally Posted by OldeMan View Post
My experience with the stock Tx/Rx is best described as "mixed": My earliest flight days went fine, but a later day suddenly showed up serious Tx/Rx problems... bad lags and twitchy response at about 1/2 field. So that evening I rearranged the Rx/antenna... and was thrilled to find, on next outing (days later), that all issues were gone... and they were gone for a couple of weeks. This last weekend, however, all symptoms reappeared... with Rx and antenna in their new location. (These experiences are all on separate *days*... i.e. I haven't seen a change in this behavior "within a single outing".)

There is one possible common-thread in my experiences so far... and Doubletap strengthens my suspicion: This past weekend, my field was soaking wet (standing water in scattered pools after a lengthy rain) and the humidity was horrible... I felt drenched just standing there. I'm struggling to remember if my first couple of troubled-flights were similarly humid? I have been in that field before, with this plane, on similar post-rain/standing-water days... I just can't remember for certain if that coincided with my earlier Tx/Rx issues. Quite possible.

One possible counter-point, though: My son was out with me, on my earlier trouble-day... with his stock 2.4GHz gear for a Dynam Hawk Sky... and he had no bad symptoms at all. So the "humidity" suspicion can't be applied to all 2.4GHz gear.

So, the way I see it: Two tests are in order...

1) I haven't changed anything, in my setup, since my most recent "bad day". I'll head out when the park is dry and humidity is low to see if my Tx/Rx issues have magically cured themselves.

2) I've ordered DSM2 compatible Rx+satellite (expected arrival yesterday). On our next post-rain/humid day... I'll make a point of going out to test both systems.

My sacrifice for science -- fly more.

another critical factor with 2.4 Ghz is the TX and RX antenna positioning, so it's possible that the combination of the wet conditions at your field and touchy antenna positioning could be the source of your inconsistent results. It's too bad because I've never encountered such sensitivity to either condition with my old 72 Mhz setups over nearly 4 decades of use. Although 2.4 ghz technology has some convenience aspects like virtually no chance of frequency conflicts, but it is far from perfect with it's own shortcomings.
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