Re: [Repeater-Builder] antenna plan
I didn't answer because I didn't have a good one. I think what you were going to try has a high likelihood of not working well. You didn't saw what band, as I recall. I'd stick with a single antenna. Chuck WB2EDV - Original Message - From: Paul Holm To: Repeater-Builder@yahoogroups.com Sent: Thursday, August 19, 2010 10:25 PM Subject: Re: [Repeater-Builder] antenna plan Hopefully it is not uncool to be the first to respond to one's own post. I'll take the fact that there was no flood of flames, or naysayers, to indicate that my plan is worth attempting. So as a follow-up question, I would ask, could anyone offer recommendations for a yagi, corner reflector, or other directional antenna, suitable for duplex use, with a beamwidth of no less than 30deg and a gain of no less than say 7dB? 73 Paul - Original Message - From: Paul Holm I'm looking for input on an antenna plan. I'd like to change to an ellliptical pattern that favors the bigger town in the county which is roughly at 270 deg west and about 6 miles away. I'd like to take a yagi or corner reflector and mount it lower, at the railing or a short distance up the mast, and point it at the town I'd like to focus on -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3082 - Release Date: 08/19/10 14:35:00
Re: [Repeater-Builder] antenna plan
Sorry. VHF. - Original Message - From: Chuck Kelsey I didn't answer because I didn't have a good one. I think what you were going to try has a high likelihood of not working well. You didn't saw what band, as I recall. I'd stick with a single antenna. Chuck WB2EDV
Re: [Repeater-Builder] antenna plan
Then I'd take a DB-224 antenna and point the elements toward your desired areas. If you split and mount another antenna elsewhere, you are going to create a highly unpredictable pattern with two different radiation centers, creating multipath possibilities. At least that's my take. Chuck WB2EDV - Original Message - From: Paul Holm To: Repeater-Builder@yahoogroups.com Sent: Friday, August 20, 2010 9:04 AM Subject: Re: [Repeater-Builder] antenna plan Sorry. VHF. - Original Message - From: Chuck Kelsey I didn't answer because I didn't have a good one. I think what you were going to try has a high likelihood of not working well. You didn't saw what band, as I recall. I'd stick with a single antenna. Chuck WB2EDV -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3083 - Release Date: 08/20/10 02:35:00
Re: [Repeater-Builder] antenna plan
Your omni + yagi configuration will work. It has been used in the land mobile field for many years, but not very often. You get a keyhole shaped pattern. Phasing shouldn't be a big issue but feel free to play with cable lengths. Use a decent power divider as well. Bill KB1MGH From: Paul Holm p...@chargertech.com To: Repeater-Builder@yahoogroups.com Sent: Fri, August 20, 2010 8:04:48 AM Subject: Re: [Repeater-Builder] antenna plan Sorry. VHF. - Original Message - From: Chuck Kelsey I didn't answer because I didn't have a good one. I think what you were going to try has a high likelihood of not working well. You didn't saw what band, as I recall. I'd stick with a single antenna. Chuck WB2EDV
Re: [Repeater-Builder] antenna plan
Hopefully it is not uncool to be the first to respond to one's own post. I'll take the fact that there was no flood of flames, or naysayers, to indicate that my plan is worth attempting. So as a follow-up question, I would ask, could anyone offer recommendations for a yagi, corner reflector, or other directional antenna, suitable for duplex use, with a beamwidth of no less than 30deg and a gain of no less than say 7dB? 73 Paul - Original Message - From: Paul Holm I'm looking for input on an antenna plan. I'd like to change to an ellliptical pattern that favors the bigger town in the county which is roughly at 270 deg west and about 6 miles away. I'd like to take a yagi or corner reflector and mount it lower, at the railing or a short distance up the mast, and point it at the town I'd like to focus on
Re: [Repeater-Builder] antenna plan
I had a corner reflector on my very first UHF ham repeater for a while. No problems with duplex operation or anything. The pattern was pretty much as you see in the catalogs. The front to back ratio was remarkable. After a while, I got some more money and changed it out. Best Regards, W1EL Eric Lowell Eastern Maine Electronics Inc. 48 Loon Road Wesley ME 04686 eme@starband.net www.satnetmaine.com 207-210-7469 From: Paul Holm p...@chargertech.com To: Repeater-Builder@yahoogroups.com Sent: Thu, August 19, 2010 10:25:51 PM Subject: Re: [Repeater-Builder] antenna plan Hopefully it is not uncool to be the first to respond to one's own post. I'll take the fact that there was no flood of flames, or naysayers, to indicate that my plan is worth attempting. So as a follow-up question, I would ask, could anyone offer recommendations for a yagi, corner reflector, or other directional antenna, suitable for duplex use, with a beamwidth of no less than 30deg and a gain of no less than say 7dB? 73 Paul - Original Message - From: Paul Holm I'm looking for input on an antenna plan. I'd like to change to an ellliptical pattern that favors the bigger town in the county which is roughly at 270 deg west and about 6 miles away. I'd like to take a yagi or corner reflector and mount it lower, at the railing or a short distance up the mast, and point it at the town I'd like to focus on I
[Repeater-Builder] antenna plan
I'm looking for input on an antenna plan. Currently have a Diamond X500HNA on a water tank. Antenna is mounted on a mast, clamped to the fill pipe on the side of the tank, with base of antenna just above the top of the tank in order to maintain a circular pattern. See the picture attached, taken of the west side of the tank. I'd like to change to an ellliptical pattern that favors the bigger town in the county which is roughly at 270 deg west and about 6 miles away. The fill pipe is located on this side of the tank. I'd like to put a Decibel 2-bay folded dipole (model?) that I already have, on our mast so that it is above the tank. I'd like to position the dipoles so that one is at about 30 deg NE and the other is at about 150 deg SE. Here's where the elliptical part comes in. I'd like to take a yagi or corner reflector and mount it lower, at the railing or a short distance up the mast, and point it at the town I'd like to focus on at 270 deg west. It would be fed together with the Decibel using a coaxial power divider. The vertical distance from the bottom of the Decibel and the directional antenna would be about 25 feet. I'm thinking that someone has done this before. How does it perform? Can you put antennas to work together like this and come up with a nice egg-shaped pattern without deep nulls? I am willing to spend time working to get accurate phasing lines fabricated for the power divider. Will I run into problems with patterns shifting because of any slight impedance mismatches between the phasing lines and the feedpoints of the antennas? In simple terms, what I'm shooting for is base/mobile coverage out to about 25-30 miles from the NW clockwise around to the SW, and handheld coverage in the town to the west in my elliptical 'blob'. I realize that there are a lot of other variables involved in coverage area such as output power, sensitivity, feedline loss, haat, and so on. Thanks for your input. 73 Paul - KC0HSTattachment: P4120024.JPG
