Ruggedized antenna for NOAA sats?
I'm currently building a VHF APT image receiver for my vehicle, and need
a suitable antenna design that is rugged enough to survive the rigors of being hit by hail and strong winds. It also needs to be relatively compact because I need to fit other antennae on the roof too. I was thinking some sort of helical. Anyone got suggestions of what would be best? Thanks, David |
Ruggedized antenna for NOAA sats?
"David Findlay" wrote in message ... I'm currently building a VHF APT image receiver for my vehicle, and need a suitable antenna design that is rugged enough to survive the rigors of being hit by hail and strong winds. It also needs to be relatively compact because I need to fit other antennae on the roof too. I was thinking some sort of helical. Anyone got suggestions of what would be best? Thanks, David David I have some experience with APT imaging and antennas for NOAA satellites. You can contact me at my E-mail address for more info and pictures. I wouldnt be optimistic about being able to get good images with an antenna that is permanently mounted above the top of a car. Are you aware that Walter Maxwell frequents this news group? He has to be the best source of guidance on APT antennas *anywhere*. Jerry |
Ruggedized antenna for NOAA sats?
"David Findlay" wrote in message
... I'm currently building a VHF APT image receiver for my vehicle, and need a suitable antenna design that is rugged enough to survive the rigors of being hit by hail and strong winds. It also needs to be relatively compact because I need to fit other antennae on the roof too. I was thinking some sort of helical. Anyone got suggestions of what would be best? Thanks, David The Quadrafilar Helix (QFH, QFHA, QHA) is regarded as a good performing antenna. Some web pages: Dutch site for building your own (at 137 MHz - it will be tall). http://www.kunstmanen.nl/antenna.htm Steve Blackmore had a "how to" build QFA web page -- but it is currently not up (you can e-mail him) http://www.pilotltd.net/ Bill Sykes (G2HCG) and Bob Cobey (G0HPO) http://www.askrlc.co.uk/ QFH - DIY (European site) http://homepage.ntlworld.com/phqfh1/qfh_diy_guide.htm g. beat w9gb |
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