Le jeudi 26 mars 2015 03:11:38 UTC+1, Darryl Ramm a écrit*:
On Wednesday, March 25, 2015 at 6:24:34 AM UTC-7, Tango Whisky wrote:
Le mardi 24 mars 2015 21:23:51 UTC+1, WaltWX a écrit*:
On Tuesday, March 24, 2015 at 12:32:03 AM UTC-7, waremark wrote:
Your performance is way better than my Euro Flarm fitted inside the LX 9000.

My problem with the range analysis tool is that it only tells you where you did pick up gliders. It does not tell you about the Flarm equipped gliders which you did not pick up. Did you never get contacts (or gliders) 'suddenly' appear closer than say 2k?

Mark Burton

Well, over my last two seasons of flying nobody seemed to "sneak" up on me with the flarm signal. However, it is obvious when following others that when you get behind and slightly below them in a glider with a carbon fuselage, that the signal drops out pretty quickly... say in less than one mile. One possible solution would be to put a second antenna (receive only is all that's available) on the bottom. That way, someone else couldn't sneak up on me. Does anyone else out there have experience with a second flarm antenna?

Walt Rogers

I have an antenna splitter installed. First antenna is a stripe antenna in the canopy (laterally & slightly behind my head), second antenna is the standard lambda/4 "toothpick" by the gear door. The Ventus cM is all carbon, and I have 5 km reception all around with a Flarm 5.

As pointed out an antenna splitter is not what you should be using. That will lead to signal reinforcement or cancellation depending on the relative phase of the signals from each antenna. It might help you when one receiver antenna is significantly blocked from receiving the transmitter signal but can cause serious reception problems when a transmitter signal is visible to both antenna. This is just not the way to to this. The proper way is to utilize a device designed for two antennas, like with the PowerFLARM, which essentially contains two separate receiver front ends, one for each antenna. And various FLARM documentation specifically says don't use an antenna splitter... for this exact reason.

The splitter I have is from Bernd Dolba (www.dolba.de - German only, sorry for that...)and was designed for Flarm's. Both antennas are polarized 30-45° from vertical.
I don't care about limiting contact range to 5 km, but I care a lot about not having blind spots. With an all-carbon fuselage, you can't avoid blind spots if you're just using one antenna.

Cheers
Bert