Hi Brian! Nice work!
/Björn > Several years back we had the discussion about choke ring antennas. > > Dr Thomas Clark - retired NASA - Goddard Space Flight Center - I believe > he was head of the VLBI project - made a simple choke ring antenna with > an electrical junction box. > > I made 3 sets using pie plates. I promised somebody the pictures and > forgot it until now. The pictures are hosted at > > http://kc0onr.com/Brian/_MG_0668.jpg > http://kc0onr.com/Brian/_MG_0669.jpg > > I made these units because were I lived was surrounded by mountains 3/4 > around my property and I was at 720 feet elevation and the mountains > varied from 1000 to 1200 feet. I had a problem that my receivers jumped > positions several times and I suspected a multi path problem. I made > the first antenna using some RF adsorbent material around the antenna. > Helped. After making the choke rings, the problem went away. The other > two units were used for carrier phase surveying. With the Motorola > Oncore VPZ unit and Waypoint's GrafNav software I could get resolution > down to a little under an inch. > > Brian KD4FM > > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
