[time-nuts] Choke Ring Design for L1

[geo at drbertges.de]

Hi there,

just to prevent from making mistakes ...

You can have two different accessories for GNSS antennas:
1) a ground plane
      it prevents the antenna from receiving signals from beneath the 
      antenna (from the ground, roof or whatever is beneath) 
      ... so this could be your pie pan normaly
2) a choke ring
      it creates an area of high impedance around your antenna;
      because it is just a (set of) simple quarter wave waveguide(s) with
      short-circuit on one end, you can build it from a sheet of metal by 
      yourself; you only need to calculate the sizes for your waveguide on 
      the L1 frequency ... and if you are a lucky guy and your pie pan fits 
      these sizes, you probably can use it for that ;-) 

Best regards

Martin