[Repeater-Builder] Re: [Repeaters] Looking for HD 440 Yagi
At 05:33 PM 7/1/2010, DW wrote: Larsen used to make a heavy duty yagi in the 430-450 MHz range (+11dBi ) for under $100.00. They still make the YA34xxYN series, but they don't list the ham split in the latest catalog. I need it for a control link from my repeater site (high winds, ice, etc..). Does anyone know of a decent 440 yagi that is still being manufactured? Thanks, David, AC4JF I've been specifying the PcTel (Maxrad) BMOY series antennas for installation in a system where they had been using the MYA series. The MYA has an exposed gamma match, which I'm not thrilled about, and is very time consuming to tape up the RF connection, and thus generally not done correctly...but there are ~100 of those in use for about 9 years now without any specific antenna failures that I'm aware of. The BMOY series antenna places the N connector on the rear of the boom, and the driven element matching is internal to the antenna. Sealing the antenna connection is very easy. There are about 70 more BMOY series antennas in use in this same system for about 7 years now, and again I've not heard of any failures, though on one that I had been using for DFing interference, I did manage to crack off the driven element base insulator. In DF use, I did notice that the 5 element BMOY's pattern wasn't as clean as an old 5 element Decibel Products antenna I also had on hand. The MYA's tend to have finicky tuning, and I've never seen one sweep correctly out of the box. Close enough probably, but not optimized either. The BMOY's are broad band, with one model covering 406-440 MHz and another from 440-480 MHz. At cost, they are a good value, with a BMOY4405 going for about $100. There are better, and correspondingly more expensive, antennas, but this is one that I've used that's proven to be a good value. I'm interested in hearing others comments on this topic as well. --Dave / KA9FUR
[Repeater-Builder] Help needed finding sources of interference
Residents of lower Michigan, I'm in need of some help identifying two different sources of interference, which appear to be originating somewhere in lower Michigan, to UHF systems in the Milwaukee area. The systems being interfered with are commercial systems, one of which is a public safety repeater. The nature of the offending signals are continuos in nature, and neither appear to be licensed. As the propagation across the lake is enhanced, they become a problem. Its hard to know how much to trust beam headings under these sorts of situations, but bearings taken seem to indicate an origin, of both signals, slightly north of Milwaukee. While it would be wonderful if the FCC was actually interested in pursuing complaints of unlicensed operation on their own, at this point I'm prepared to offer cash rewards to those which provide a verifiable source of these transmissions. If you are able to help, please contact me directly for more information. Thanks, --Dave 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] Help needed finding sources of interference
At 12:18 PM 4/26/2004, you wrote: Is there an Air Base in the neighborhood? We have interference on the UHF band here also. Several technicians spent a lot of time tracing it to the local Air Base using direction finding techniques. The Air Force people just tell you to go away, when questioned. Checking the rules, the military does have primary use of the UHF frequencies. Part 97 frequencies are not involved, and that's all I'll say in a public forum. Thanks, --Dave 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 the Yahoo! Terms of Service.
