What is the right spacing between the passive and the active elements? My antenna has a lot wider spacing as the antenna I saw here in the SatNogs project. Ok. My antenna was build in 2008 or 2009 and I can’t find the site for this again .
Where can I find the building instruction for a very good turnstile antenna?
Also the dimensions of the l/4-50Ohm-delay-line and the 2x75 Ohm // matching-line are nearly the same as in in the link. The distance between reflector and radiator is 45cm.
I don’t think, there is a formula for calculating the space between reflector and radiator.
It’s experience, with this spacing of lambda/5 you get a lifted diagram in the vertical.
You get the most gain for satellites with low elevation, the higher the elevation of the satellite becomes, the lower the antenna-gain becomes, but this compensated because the satellite get’s nearer.
The lowest gain of the antenna is, when the satellite is direct above you.
Sorry about my english, i hope it’s clear what I mean.