[Repeater-Builder] Re: Vertical squalo as 6m repeater antenna?
This DDRR antenna is also new to me but space-wise it is even smaller than the squalo so definitely worth considering, especially because I wouldn't want to try the squalo if the majority says it won't perform as expected. Would you use just one of them even though it's on the side of the tower or 2 or 4 of them around? Martin
Re: [Repeater-Builder] Re: Vertical squalo as 6m repeater antenna?
I prefer the ground plane for my 6 meter repeater. Look at these two links: http://www.repeater-builder.com/db/pdfs/db-201.pdf and http://www.repeater-builder.com/db/pdfs/db-201.pdf They are rather simple antennas, very durable and last a long time. I have one at 30+ feet now for several years and never had a problem so far. It's at the top of the tower and the folded vertical element makes it a grounded element antenna, important for lightning damage avoidance. I also believe it is a little quieter relative to wind noise. A single antenna mounted out on the far edge of the platform should work. If it is a monopole tower, you would probably want to mount the antenna so that the less favored direction is towards the mass of the tower. Joe On 6/9/2010 9:28 AM, cruizzer77 wrote: Hi Joe We have access to 3 platforms of that tower and the total height of all our antennas on all platforms must not exceed 5 meters. As far as I could find out if 2 or 4 coupled antennas would be mounted on the same level around the tower they would probably count as one system with the height of one of them. On the level where the 6m antenna(s) should be mounted there's almost nothing yet and afaik there's no problem with the distance from other antennas above, that should be more than enough. This tower has a lot of potential and to not restrict other club projects I can not claim more than about one meter out of the 5 for the 6m repeater antenna(s)... Martin Yahoo! Groups Links
[Repeater-Builder] Re: Vertical squalo as 6m repeater antenna?
Hi Joe We have access to 3 platforms of that tower and the total height of all our antennas on all platforms must not exceed 5 meters. As far as I could find out if 2 or 4 coupled antennas would be mounted on the same level around the tower they would probably count as one system with the height of one of them. On the level where the 6m antenna(s) should be mounted there's almost nothing yet and afaik there's no problem with the distance from other antennas above, that should be more than enough. This tower has a lot of potential and to not restrict other club projects I can not claim more than about one meter out of the 5 for the 6m repeater antenna(s)... Martin
[Repeater-Builder] Re: Vertical squalo as 6m repeater antenna?
cruizzer77 atlant...@... wrote: Some time ago in another post I already asked for compact 6m repeater antenna ideas as we're limited in antenna height in the place we want to install our upcoming 6m club repeater. Obviously this was no easy to solve problem. Sure it is... you just have to keep in mind that many reduced size antennas have reduced performance when compared to more standard/full size antennas. Just lately did I come across a QST article Six Meters from Your Easy Chair which describes a 6m squalo antenna built from an old easy chair. Yep, the Author revisited the old square frame loop design seen a few times through the years as variants of other round horizontal loops. I do not have the intention of building one actually from an easy chair but this gave me the idea of this type of antenna which is quite small and would be just perfect regarding the dimensions. But probably the wrong polarization (horizontal) for FM repeater work, which would normally be vertical. Can anybody tell me something about squalos for repeater usage? The Squalo is/was a brand name for a square loop horizontally polarized antenna. Versions were made and sold for various bands like 10, 11 and 6 meters. I'm looking at a 27 MHz version Squalo up on a storage shelf as I type this post. A more recent commercially sold equivalent is the M-Squared (aka M-2) 6 meter ho-loop http://www.m2inc.com/index2.html I doubt the square or round loop horizontal polarized antenna is what you want or need for your FM Repeater System. I think it should be possible to polarize it vertically by mounting it turned around 90 degrees, but I have not found any info from anybody who did that. The resultant quasi doughnut pattern would not really be usable for what you would hope it to be. The mounting conditions are on the railing of a tower platform, but it would be possible to mount more than one around it, just the height is limited. Tis not what you want... Any thoughts? Yeah, Coffee Mate in Coffee is horrible stuff... Oh, and you would hopefully find a vertically polarized antenna to fit your situation. I'll toss out the following... A vertical standard quarter wave size 6 meter antenna should or could only be about 54 inches vertical length. You might review a vertical mobile antenna on a fix mount. You might consider buying or building a DDRR Antenna: http://www.antennex.com/preview/2mddrr.htm http://w9ttw.com/ddrr.htm I'm using a few DDRR Antennas on Low-Band VHF and they seem to be modestly decent performers (for what they are). You can get out hack saw and cut way at adjacent antennas for more tower mounting space. (not really) 73 Martin cheers, s.
