Slow and easy...slow and easy... Jaime Solorza On Dec 12, 2014 11:43 AM, "That One Guy via Af" <[email protected]> wrote:
> madness we are a little better than the target after fine alignment. at > one point we had the 4' side pinting to the ground abot 100 yards out ant > it still had about a -80 on the bnc readout > > On Fri, Dec 12, 2014 at 11:36 AM, Ken Hohhof via Af <[email protected]> wrote: >> >> Yeah, it was so considerate of AT&T to leave that dish up there when >> they sold off the site, only needed to be re-aimed about 2 degrees to go >> where we wanted. And they built a platform to stand on while aiming it, >> that was awfully nice of them. And they left the flexible waveguide down >> to the shelter. I’d really hate to think about hanging a new 12 ft dish >> ourselves and running waveguide to it. And it’s an Andrew parabolic, not >> the old WE horns, so we don’t have to worry about water getting into the >> waveguide and freezing. It doesn’t even look like anyone has been using >> the lightning bolt logo for target practice. Life is good when someone >> abandons nice stuff you can use. >> >> >> *From:* Hardy, Tim via Af <[email protected]> >> *Sent:* Friday, December 12, 2014 11:18 AM >> *To:* [email protected] >> *Subject:* Re: [AFMUG] aligning bigger antennas on short paths >> >> >> HPBW for a 12 ft dish at 11.2 GHz is 0.5 degree. >> >> >> >> *From:* Af [mailto:[email protected]] *On Behalf Of *Ken Hohhof via Af >> *Sent:* Friday, December 12, 2014 11:17 AM >> *To:* [email protected] >> *Subject:* Re: [AFMUG] aligning bigger antennas on short paths >> >> >> >> Nope, a 4 ft dish in 11 GHz should be pretty narrow, a few degrees and >> you should be into a deep, deep null. Take a look at the beamwidth or >> pattern for your antenna. It should be similar to an 8 ft dish in 5.x GHz. >> >> >> >> We once used an existing 12 ft dish for an 11 GHz link and I kept having >> to tell the tower guy he was not going to be able to eyeball it. The >> beamwidth was something like 1 degree if I remember right. He ketp getting >> nada for signal until I made him slowly sweep the azimuth. >> >> >> >> >> >> *From:* That One Guy via Af <[email protected]> >> >> *Sent:* Friday, December 12, 2014 9:50 AM >> >> *To:* [email protected] >> >> *Subject:* [AFMUG] aligning bigger antennas on short paths >> >> >> >> Weve never gone above 2' >> >> we finished installing our 11ghz link yesterday and had the antennas >> rough aligned, one side is 3' one side is 4'. I expected the tighter >> patterns would make it harder to find the initial link but they actually >> linked up right off the bat and it was right on the projected power levels. >> >> This is only 10 miles, so we have visual on the path. >> >> We did a little rough alignment yesterday, and will do the fine >> alignment today. when we we roughing it there was a good amount of travel >> on the antenna (4') side we were on and only a couple db change. do larger >> antennas on such a short path give you a little more leniency in alignment >> or something? we will do full horizontal and vertical panning today to make >> sure we arent in side lobes, just curious is there is more slop in this >> scenario. >> >> >> >> -- >> >> All parts should go together without forcing. You must remember that the >> parts you are reassembling were disassembled by you. Therefore, if you >> can't get them together again, there must be a reason. By all means, do not >> use a hammer. -- IBM maintenance manual, 1925 >> > > > -- > All parts should go together without forcing. You must remember that the > parts you are reassembling were disassembled by you. Therefore, if you > can't get them together again, there must be a reason. By all means, do not > use a hammer. -- IBM maintenance manual, 1925 >
