Re: [Repeater-Builder] DB 224 Antenna Orientation on a large (?25 ft.) faced tower
Roger, My Decibel Products catalog shows that a DB224E-JJ antenna can achieve nearly omnidirectional coverage when side-mounted on a tower with a DB5001 Side Mount Kit, with all dipoles pointing inward toward the tower. This kit positions the antenna mast 18 inches away from the tower. Other spacings will probably affect the pattern significantly. 73, Eric Lemmon WB6FLY Roger White wrote: I am going to put up a Andrews dB224JJ (220 MHz antenna) on our tower at TI in Dallas. I have had an antenna on this tower up at 250-270 ft. for many years (a 6dB Stationmaster for 145 MHz and a 6dB Stationmaster for 224 MHz). Our 2 meter antenna is now a dB224, with the dipoles situated around the antenna mast as if for a top of the tower mount with an omni pattern. The 220 antena is an anemic 3 dB gain Antenx, which is not much better than a wet noodle with some gain. I seem to remember somewhere (maybe an old dB Products catalog) where for an antenna of the dB224, if you face all four dipoles toward the tower, you stand a chance of getting s more omni pattern (at least it is suppose to have somewhat equal gain ripple around the tower). The tower is 25 ft. wide on each face. The antenna will be offset from one leg around 5 to 6 feet at least. Does anyone have any experience in mounting this type of antenna in this manner? Roger W5RD Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] DB 224 Antenna Orientation on a large (?25 ft.) faced tower
Ok, many thanks. I do not have the old catalog and remember something about the orientation of the dipoles toward the tower. But, I imagine since this tower is so wide, it will affect the pattern no matter what, but the site has cheap rent :), so beggars can't be choosers! 73, Roger - Original Message - From: Eric Lemmon [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, November 28, 2005 8:31 PM Subject: Re: [Repeater-Builder] DB 224 Antenna Orientation on a large (?25 ft.) faced tower Roger, My Decibel Products catalog shows that a DB224E-JJ antenna can achieve nearly omnidirectional coverage when side-mounted on a tower with a DB5001 Side Mount Kit, with all dipoles pointing inward toward the tower. This kit positions the antenna mast 18 inches away from the tower. Other spacings will probably affect the pattern significantly. 73, Eric Lemmon WB6FLY Roger White wrote: I am going to put up a Andrews dB224JJ (220 MHz antenna) on our tower at TI in Dallas. I have had an antenna on this tower up at 250-270 ft. for many years (a 6dB Stationmaster for 145 MHz and a 6dB Stationmaster for 224 MHz). Our 2 meter antenna is now a dB224, with the dipoles situated around the antenna mast as if for a top of the tower mount with an omni pattern. The 220 antena is an anemic 3 dB gain Antenx, which is not much better than a wet noodle with some gain. I seem to remember somewhere (maybe an old dB Products catalog) where for an antenna of the dB224, if you face all four dipoles toward the tower, you stand a chance of getting s more omni pattern (at least it is suppose to have somewhat equal gain ripple around the tower). The tower is 25 ft. wide on each face. The antenna will be offset from one leg around 5 to 6 feet at least. Does anyone have any experience in mounting this type of antenna in this manner? Roger W5RD Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] DB 224 Antenna Orientation on a large (?25 ft.) faced tower
What broadcasters do to get the best pattern on a large tower is to mount the antenna on the leg coming straignt off the leg. (perpendicular with the opposite face) Paul --- Roger White [EMAIL PROTECTED] wrote: Ok, many thanks. I do not have the old catalog and remember something about the orientation of the dipoles toward the tower. But, I imagine since this tower is so wide, it will affect the pattern no matter what, but the site has cheap rent :), so beggars can't be choosers! 73, Roger - Original Message - From: Eric Lemmon [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, November 28, 2005 8:31 PM Subject: Re: [Repeater-Builder] DB 224 Antenna Orientation on a large (?25 ft.) faced tower Roger, My Decibel Products catalog shows that a DB224E-JJ antenna can achieve nearly omnidirectional coverage when side-mounted on a tower with a DB5001 Side Mount Kit, with all dipoles pointing inward toward the tower. This kit positions the antenna mast 18 inches away from the tower. Other spacings will probably affect the pattern significantly. 73, Eric Lemmon WB6FLY Roger White wrote: I am going to put up a Andrews dB224JJ (220 MHz antenna) on our tower at TI in Dallas. I have had an antenna on this tower up at 250-270 ft. for many years (a 6dB Stationmaster for 145 MHz and a 6dB Stationmaster for 224 MHz). Our 2 meter antenna is now a dB224, with the dipoles situated around the antenna mast as if for a top of the tower mount with an omni pattern. The 220 antena is an anemic 3 dB gain Antenx, which is not much better than a wet noodle with some gain. I seem to remember somewhere (maybe an old dB Products catalog) where for an antenna of the dB224, if you face all four dipoles toward the tower, you stand a chance of getting s more omni pattern (at least it is suppose to have somewhat equal gain ripple around the tower). The tower is 25 ft. wide on each face. The antenna will be offset from one leg around 5 to 6 feet at least. Does anyone have any experience in mounting this type of antenna in this manner? Roger W5RD Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links [EMAIL PROTECTED] __ Start your day with Yahoo! - Make it your home page! http://www.yahoo.com/r/hs Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] DB 224 Antenna Orientation on a large (?25 ft.) faced tower
That is the manner in which our 2 meter dB224 is mounted at present. Roger W5RD - Original Message - From: Paul Guello [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, November 28, 2005 10:00 PM Subject: Re: [Repeater-Builder] DB 224 Antenna Orientation on a large (?25 ft.) faced tower What broadcasters do to get the best pattern on a large tower is to mount the antenna on the leg coming straignt off the leg. (perpendicular with the opposite face) Paul --- Roger White [EMAIL PROTECTED] wrote: Ok, many thanks. I do not have the old catalog and remember something about the orientation of the dipoles toward the tower. But, I imagine since this tower is so wide, it will affect the pattern no matter what, but the site has cheap rent :), so beggars can't be choosers! 73, Roger - Original Message - From: Eric Lemmon [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Monday, November 28, 2005 8:31 PM Subject: Re: [Repeater-Builder] DB 224 Antenna Orientation on a large (?25 ft.) faced tower Roger, My Decibel Products catalog shows that a DB224E-JJ antenna can achieve nearly omnidirectional coverage when side-mounted on a tower with a DB5001 Side Mount Kit, with all dipoles pointing inward toward the tower. This kit positions the antenna mast 18 inches away from the tower. Other spacings will probably affect the pattern significantly. 73, Eric Lemmon WB6FLY Roger White wrote: I am going to put up a Andrews dB224JJ (220 MHz antenna) on our tower at TI in Dallas. I have had an antenna on this tower up at 250-270 ft. for many years (a 6dB Stationmaster for 145 MHz and a 6dB Stationmaster for 224 MHz). Our 2 meter antenna is now a dB224, with the dipoles situated around the antenna mast as if for a top of the tower mount with an omni pattern. The 220 antena is an anemic 3 dB gain Antenx, which is not much better than a wet noodle with some gain. I seem to remember somewhere (maybe an old dB Products catalog) where for an antenna of the dB224, if you face all four dipoles toward the tower, you stand a chance of getting s more omni pattern (at least it is suppose to have somewhat equal gain ripple around the tower). The tower is 25 ft. wide on each face. The antenna will be offset from one leg around 5 to 6 feet at least. Does anyone have any experience in mounting this type of antenna in this manner? Roger W5RD Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links [EMAIL PROTECTED] __ Start your day with Yahoo! - Make it your home page! http://www.yahoo.com/r/hs Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
