In laymans terms Is a distance thing and about seeing different noise
by comparing and differentiating two signals, its possible to get more signal above the noise layer…its clever maths! the further apart the better. the further away from any RF noise source the better its common in fixed wing to have on top of the fuze and one on the bottom which is what the powerflarm was developed for In a glider an aerial at each wing tip with would make the best sense as you mostly want forward looking diversity and the wing tips would be low noise. but given thats not generally possible and you would want pre-amps in each one to account for cable loss its all bit impractical so to get some separation, one of the turtle deck and one behind the engine bay somewhere (not shielded by metal or carbon) would be productive. I will stress this again, the best way to get the best distance is to have really low RF noise levels on your power circuits and do not put anything RF active anywhere near the Flarm antenna. GPS pucks should be at least 100mm away. DO NOT using low cost voltage convertors EVER, NEVER EVER. Do not put PDA devices with Flat Batteries in the cockpit expecting them to charge from other devices. Lots of PDA including older Oudies generate a truck load of noise…try putting a hand held radio near any of them, turn the squelch down…you will see what I mean Flarm transmits at very low power signals and the Rx signal is very easily swamped. If there is RF noise on the power rail, it will effect the Flarm receive distance > On 25 Aug 2017, at 10:51 am, Future Aviation Pty. Ltd. > <[email protected]> wrote: > > Good morning all > > I will shortly install a second Flarm antenna to my ASH 30 Mi but I need some > help as I’m unsure of its optimum position. > > My Powerflarm Core (and its antenna) are mounted under the glare shield of > the rear instrument panel and hence directly > behind the front seat pilot. I feel that this might attenuate the FLARM > signal and therefore I’m keen to place the second > antenna for optimum reception. Advice already received indicates that the > second antenna is best installed well clear of > the first (primary) one. > > If anyone has done something similar I would love to hear the results. I > would also welcome further advice from specialists > in this field. > > Many thanks in advance and kind regards to all > > Bernard > > > _______________________________________________ > Aus-soaring mailing list > [email protected] > http://lists.base64.com.au/listinfo/aus-soaring _______________________________________________ Aus-soaring mailing list [email protected] http://lists.base64.com.au/listinfo/aus-soaring
