Techniques > Radios
Moving to 2.4Ghz....
Happy Days:
Fred, I wouldn’t try using the module without an antenna…………. That might cause the output stage (P.A. stage) of the module to blow. :shock: (high voltage Standing Wave Ratio,…….and all that jazz)
I suggest you consult the manufacturers and ask them how to reduce the power for range testing. I would think there would be some way of reducing the power, or shielding the antenna, :?: for the purpose of range testing.
K.
Fred:
No, no way of reducing the power. Not a surprise for a 20 euros module really :D
I'll do the range check in Mt Leinster, at least, I'll know live, and in real situation !
Fred:
Alright, here is a quick report about this cheapo 2.4ghz system : it works ! :D
Ok, so Sunday, went to the big L. The Easyglider fully charged with the Corona receiver inside. Note that, to push the test to the max, I did not bther putting the aerials at 90 degrees and all that! I just put the receiver as it is, slided under the wings in the canopy, so basically, the aerials where more or less twisted togeter, and bent over the receiver ! Like a pig, in purpose !
And did not bother with a range check, just launched the glider as it came... And flew as far as I could see the thing, in all positions possible, and no glitches or loss of signal !
Not bad for a 20 quid module/receiver !
So, flew most of the day with the EG, and no problems at all !
But, with Keith, we pushed a bit further the test... During a bit of rain, I standed behind Keith, the TX aerial glued to his back (jacket all wet by the rain), and the EG, in the cloud !
Had a few glitches (the movements of the controls were a bit like that was step by step) but I never loss the signal at any moment ! And all went back to normal when I moved from behind Keith... A bit extreme situation, but all went great !
Conclusion : It works ! Not bad at all even, but I want to push that thing further. Next, receiver in the Alpina... But before I'll do a proper range check and stick to the plan to leave the TX at 9 stones, and drive down to the West slope.. If I still have signal there, well, all good ! (that's at least a mile away...)
Stay tuned ! :D
IceWind:
That is great news., but let me note than down... "never let Keith pass on my front with a wet jacket..." :lol: :lol:
Btw I'll post here a nice link that shows some tests on 2.4Ghz regarding signal quality and lockouts. They tested the antenas is several positions.
The system used was from Assan but for the purpose it doesn't matter.
http://www.flyelectric.ukgateway.net/24logger.htm
Happy Days:
An interesting site Nando. :?: Thank You. :clap:
It shows the importance of having the rx antenna's at 90 degrees to each other. It’s a pity not all the tests were done with the same flight pattern. (Some were climbs and descents, other tests were done while flying aerobatics,……..but interesting statistics none the less. :) )
Incidentally, it wasn’t my wet jacket that attenuated the signal from Fred’s Tx so much as the fact that my body, which is 90% water. (Or in Ed's case, 90% alcohol. :lol: ) And the signal had to pass through me to get to the plane. (Remember also that Fred did not have the rx antennas at 90 degrees to each other.)
Thanks again for the link
Keith
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