[amsat-bb] Re: 70cm Helicoil Good/Bad expensive?

Joe Leikhim rhyolite at nettally.com
Tue Jul 12 07:05:26 PDT 2011

Helical antennas are wonderful things. However with one caveat, they 
respond in "normal mode" over a wider bandwidth than the desired axial 
mode. What this means is that your receiver is more susceptible to 
overload from _out of band_ signals than it might be using a Yagi having 
a resonant match. Be sure your preamp is a high end model with 
coincidentally, " a helical" front end filter.

Joe Leikhim

Leikhim and Associates
Communications Consultants
Oviedo, Florida


JLeikhim at Leikhim.com


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