Ruggedised transmitter for remote camera control: part 7

Range check. As Ramon pointed out in comment to the last post the 2 radios have to co-exist and this is not simply a matter of putting them in a box, supplying power and bolting on antennae._DSC3798With the kite line under my armpit I walk down the line upwind watching the signal on the receiver- I repeated this with various set ups until I was happy I’d found the optimum array.

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It’s not what I expected:

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As the video transmitter gets further away its signal is weaker and the RC transmitter blots out the signal. The relative position and orientation of the antennae need to be determined. The only way to do this is to fly the thing and see what works. The tidy set up failed very quickly- the antennae were too close together. Next I swapped in a pole for the circular polarised Rx and reduced the size of the Tx antenna.

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At 60mAGL I was able to track slow moving vehicles by video.
There was something of a null patch around 30-40m AGL with dramatic improvements with greater altitude. Further experiment showed a change in signal quality according to the contact of the antenna contacts with the metal case, the Tx did better with insulation and the Rx without.
I’m impatient to get the case closed but reliable separation between Tx and Rx is essential 1st.
A small victory is that the battery pack charges via the GT Power 606-D charger on the NMih ‘auto’ setting, it detected the voltage and fed the current correctly. The Jack socket needed to be double insulated from the case shell to work. One switch , one charge replace 3 separate operations on the previous set up. Progress indeed.

 

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About billboyheritagesurvey

Heritage worker
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