A DB212 must be mounted with a metallic mast (or tower) parallel to, and extending beyond, the element. It sounds like you may have rules this antenna out as a possibility.
A ground plane antenna is typically not side mounted on a tower. Depending on the distance of the platform rail to the tower, it may work. One option: http://www.krecoantennas.com/fgplane.htm If it's a commercial site, they may not permit a home-brew. Chuck WB2EDV ----- Original Message ----- From: "cruizzer77" <[email protected]> To: <[email protected]> Sent: Wednesday, February 03, 2010 9:34 AM Subject: [Repeater-Builder] Re: Space-saving 6m repeater antenna? > > > You're right, the mounting location is on the lowest platform of this > particular mast at a height of about 15m. The antenna is to be mounted > sideways to the rail of the platform. Probably it would be possible to > mount 2 antennas on the opposite sides of the platform, but this is not > clear yet (was a question for the DB212 also). > > Is there somebody on this list who has built a shortened (i.e. base > loaded) 6m antenna, probably for mobile use? I'd be interested in the > design and the experiences with it. Not much is to be found on the net > regarding 6m designs in particular. > > 73 > Martin > > > > --- In [email protected], "Chuck Kelsey" <wb2...@...> > wrote: >> >> You haven't given us a clue as to the mounting location. >> >> A ground plane antenna is going to be about 54" high and would be about >> the >> shortest configuration I can think of. A base-loaded mobile antenna >> mounted >> on a ground plane would be a few inches shorter. >> >> Chuck >> WB2EDV >> >> >> >> ----- Original Message ----- >> From: "cruizzer77" <atlant...@...> >> To: <[email protected]> >> Sent: Wednesday, February 03, 2010 8:25 AM >> Subject: [Repeater-Builder] Space-saving 6m repeater antenna? >> >> >> > For our 6m repeater project I had planned to use a DB212 clone as an >> > antenna. But the repeater is to be located at a commercial site >> > unfortunately and it turned out lately that antenna height is >> > restricted >> > so much that the height of about 2.5 meters of a single DB212 may >> > already >> > be too much. >> > >> > Can anybody tell me something about a 6m repeater antenna which is >> > optimized for reduced vertical space but is still polarized vertically? >> > I >> > guess if the DB212 is too tall the height of another antenna will need >> > to >> > be half that size or even less. I'm interested in a homebrewable design >> > primarily, I was also going to build the DB212 clone myself. >> > >> > 73 >> > Martin >> > >> > >> > >> > ------------------------------------ >> > >> > >> > >> > Yahoo! Groups Links >> > >> > >> > >> >> >> -------------------------------------------------------------------------------- >> >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com >> Version: 9.0.733 / Virus Database: 271.1.1/2664 - Release Date: 02/02/10 >> 14:35:00 >> > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2665 - Release Date: 02/03/10 03:09:00
