[Repeater-Builder] Re: Closed Repeaters
Lawsuits will be the death of us if we don't change how and when they are used! The freq allocations that the government has allowed us to use are put there for the masses to use not for a priveleged few. There are other avenues available besides amateur repeaters to handle and allow specific use as well as limit those that can use them. I agree completely that open systems should be given priority over closed ones for coordination simply because the mere idea of a closed system goes against what the Ham spirit is supposed to be about. I do think owner/operators should be able to ban certain users due to continuous problems but this is much different than closing a system. HF has been used as an example so I will try that one too. Just because your friend may have a killer 160M antenna does not give you the right to go into his house uninvited and use his antenna. Besides he may have a loaded gun. It also does not give him the right to squat on a freq and hold it for years deciding who can use it and who can't. What I would like to see happen is this guy would invite anyone interested in 160M DX to come for a visit and use his station or if met on the air allow the other guy to join in the qso. Maybe we should establish coordination groups for HF freqs too!!!(kinda works that way on 75M anyway) Tim KB2MFS --- In Repeater-Builder@yahoogroups.com, MCH m...@... wrote: Repeater coordination should be granted or denied based on interference matters, not on how someone wants to operate their repeater. Since people have the right to control their private property, such a policy is begging for a lawsuit. Joe M. Mike Mullarkey wrote: Being a past chairman of a coordinating council, we had many applications for close repeater systems. All and every application that was applied for was denied coordination unless they changed their closed status to an open status.
[Repeater-Builder] Re: Antenna recommendations 220
The side arm is made of welded aluminum and the top arm or stabilizer is PVC. Last check of the antenna the radials were tight and nothing in the near field that I can find is loose. Hopefully this weekend we will be able to have a close look at everything and do some testing to determine where the problem may be. Thanks for the help. Tim KB2MFS --- In Repeater-Builder@yahoogroups.com, Kevin Custer [EMAIL PROTECTED] wrote: Tim and Janet wrote: This is a side mounted installation on a tower, Rohn 25. The first G7-220 antenna was damaged in the wind. The current one seems to get noisy at times and we suspect the antenna as the culprit. When we installed this one we also used a standoff to help stabilize the top of the antenna in the hopes that it wouldn't be bothered by storm winds. As soon as we get some time to take a closer look at the problem we will investigate the issues a little more to be sure the real problem is the antenna. Some questions: What is the Side Arm made from? Are the ground radials tight? Is there anything in the near field of the antenna that is loose? http://www.repeater-builder.com/antenna/cracking.html Kevin
[Repeater-Builder] programming software
Does anyone know if there is a source for freeware programming software for the Motorola GP300, GP350, and the Kenwood TK390? I am also in need of the cables/hardware? Thanks Tim
[Repeater-Builder] Re: Tower to antenna spacing
Thanks Fred. I will see what I can find. Tim KB2MFS --- In Repeater-Builder@yahoogroups.com, FHS [EMAIL PROTECTED] wrote: Tim: Try and get an old DB, Antenna Specialist, or Phelps Dodge base station antenna catalog. They have some curves that are fair approximations of side mount antennas on small surface towers(EG. Rohn 25G,45G, 55G). Most mfg. had recommended 1/4 wavelength between the antenna and the tower. On large surface towers you should be a couple of wavelengths off of the tower and even then you will have some deep nulls in the coverage. Fred W5VAY - Original Message - From: Tim and Janet To: Repeater-Builder@yahoogroups.com Sent: Friday, March 02, 2007 8:26 PM Subject: [Repeater-Builder] Tower to antenna spacing What is the standard spacing for a VHF antenna side mounted on rohn 25 tower? I found a page on repeater builder that showed 1/4- 1/2 wavelength with a null behind the tower. I don't want to mount it any further than 4' from the tower but of course I would like to minimize the influence the tower has on the pattern. Anybody have a suggestion or a good source (link) of information? Thanks. Tim KB2MFS
[Repeater-Builder] Re: Need Help... where can I buy a DSL-Internet repeater...?
No I haven't tried it yet. I did some modeling and with 150mw, 20dbi antennas and the antenna at the friends house mounted up 21 feet (he doesn't have a tower and isn't a Ham) and the antenna mounted at least 60 feet up my tower it showed a good path. This was 7.22 Km and despite the non line of sight. I was hoping for 2.4 Ghz equipment since it is readily available running 200mw and 24 dbi antennas. I had also planned to mount the units at the antenna point. I was just second guessing the software models results. I am pretty cheap so didn't want to spend the money on equipment if I wasn't reasonably sure it would work. I have never used anything near 2.4 Ghz but I would think it would be rather difficult to line up the antennas. Other than a rough guess what is the best way to do this? It looks like every milliwatt may matter in this installation. Thanks for your help and the explanation of your systems. Tim --- In Repeater-Builder@yahoogroups.com, Kevin Custer [EMAIL PROTECTED] wrote: Hi Tim, Some of the AP and Client equipment we use is assembled from parts-pieces. Some of this stuff , like our 900 MHz gear, is built from small computer boards that run a Linux OS and have MiniPCI radio cards that make a complete wireless router, ap, or client device. We use the PC Engines WRAP and MikroTik RouterBoard. The RouterBoard comes with the OS, however the WRAP you must install some OS on it; for those we use StarOS and StarV3. Building such a system is not for the faint of heart, because some knowledge of IP routing is necessary to make it all work. I have a few NON line of sight paths working on 2.4 GHz. There are amplifiers that can really make a difference with the 2.4 stuff, and depending on where you are in the world, they may be legal. Some of these paths run 1 watt of TX rf and have pre-amps for the receive signal. They run very tight 24 dB grid parabolic antennas 2.4 GHz is the cheapest band for internet equipment as there has always been a flood of stuff made for it, but there can be a lot of interference to overcome. Have you tried to make your shot work? If so, what did you use? Tim and Janet wrote: Kevin, can you go into a little more detail on your system? I am in the same situation and a friend that has both DSL and Cable available has agreed to let me install a system between his and my house. The path is 7.2 km and is not line of sight. I have a slight hill between us. If he just had a tower too we could make it on 2.4 Ghz. What are the radios, antennas, other equipment used? Power output? Thanks for the info. Tim
[Repeater-Builder] Heliax connectors
Where is the best place to get 7/8 heliax connectors reasonably priced. I am looking for N female type. Tim 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/
