While I don't have a whole lot of 6m repeater experience, I've got 10 years of public safety 45 MHz experience. About 20 years ago, I had a 45 MHz public safety system on a platform at 1450'. The person who originally installed it used a DB Products vertical mounted to the platform rail- the performance was abysmal. I replaced the vertical with a single DB-212 loop mounted about 50' above the platform and the station came alive.
Eventually we added a second DB-212 loop 50' below the platform and made the station a repeater; it covered a significant portion of Central Florida even though the mobiles were running Stico disguised antennas. BTW, the DB-212 needs to be mounted to a tower leg so that there is a solid "mast" behind it; that is how it is designed. Mounting it on a platform rail will likely result in reduced performance. Doug K4AC From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of cruizzer77 Sent: Wednesday, February 03, 2010 9:35 AM To: Repeater-Builder@yahoogroups.com 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
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