Re: [Repeater-Builder] Re: 6mtr duplexer
Al, Using 3 1/8 Heliax is approaching the proper length to diameter ratio for optimum Q which should provide a deeper notch and increase the total isolation. It may even be enough to eliminate one cavity per leg. All of the designs I've seen use the foam type, I doubt the air line insulator supports will provide enough mechanical stability. Bruce, WB6ARE On Mar 16, 2006, at 7:31 AM, Al Wolfe wrote: Most of the discussion I've seen for the 6 meter Heliax duplexer has been centered around using 1 5/8 Heliax. Has anyone used 3 1/8 stuff? Would there be any advantage to using the larger size? I have some available. Has anyone used the foam 1 5/8 instead of air line for a duplexer? Thanks, Al, K9SI 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] Balloons to be tested as cell-tower Replacement...
Good Day Last October at the Armadillo Intertie Annual meeting I attended an excellent presentation and live demo by Space Data Corp. The balloon was at about ninety thousand feet altitude somewhere east of Dallas and we talked with one of their engineers in Dallas via a 900 MHz HT from Austin, TX. The DSP in the balloon was reprogrammed from it's normal data mode to repeat voice FM for the demo, running about 3 watts on a low gain antenna. The balloon payload weighs a maximum of 6 pounds (per FAA), this includes the battery, TX/RX, a GPS to measure position in three dimensions, DSP and sand for ballast. It takes 1-2 hours for ascent to 90k feet, a valve releases excess helium to stop the ascent and then releases sand to compensate for helium leakage and maintain the altitude for the typical 12 hours of usable time. It takes 6 balloons to provide coverage and redundancy for all of Texas so in a 24 hour period some 12+ balloons are launched every day to ensure at least 6 are continuously at altitude. Payloads cost ~$1500 each and can be reused about 10 times, their recovery rate is around 90 percent and the payload sends it's GPS position back up to the balloons on orbit as they descend via parachute clear down to ground level. Their primary use has been for vehicle tracking and data collection. Space Data Corp has been doing this 7/24 for over two years for Texas. This system is being evaluated for Mexican boarder patrol using something like seven balloons and also for military communications for all of Iraq. It should be interesting to see how well this works for cellular. These people are serious and know how to do this technology better than anyone else. Some of them are hams too! http://www.spacedata.net/ Bruce WB6ARE 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/
[Repeater-Builder] Balloons to be tested as cell-tower Replacement
Good Day Last October at the Armadillo Intertie Annual meeting I attended an excellent presentation and live demo by Space Data Corp. The balloon was at about ninety thousand feet altitude somewhere east of Dallas and we talked with one of their engineers in Dallas via a 900 MHz HT from Austin, TX. The DSP in the balloon was reprogrammed from it's normal data mode to repeat voice FM for the demo, running about 3 watts on a low gain antenna. The balloon payload weighs a maximum of 6 pounds (per FAA), this includes the battery, TX/RX, a GPS to measure position in three dimensions, DSP and sand for ballast. It takes 1-2 hours for ascent to 90k feet, a valve releases excess helium to stop the ascent and then releases sand to compensate for helium leakage and maintain the altitude for the typical 12 hours of usable time. It takes 6 balloons to provide coverage and redundancy for all of Texas so in a 24 hour period some 12+ balloons are launched every day to ensure at least 6 are continuously at altitude. Payloads cost ~$1500 each and can be reused about 10 times, their recovery rate is around 90 percent and the payload sends it's GPS position back up to the balloons on orbit as they descend via parachute clear down to ground level. Their primary use has been for vehicle tracking and data collection. Space Data Corp has been doing this 7/24 for over two years for Texas. This system is being evaluated for Mexican boarder patrol using something like seven balloons and also for military communications for all of Iraq. It should be interesting to see how well this works for cellular. These people are serious and know how to do this technology better than anyone else. Some of them are hams too! http://www.spacedata.net/ Bruce WB6ARE 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] DB224-E Data
Doug,Thanks for the DB224E data, your document is outstanding and I appreciate your time spent getting the details in a PDF.Bruce WB6AREOn Dec 12, 2005, at 9:05 PM, Doug Zastrow wrote:To All I Promised this Info, My DB224-E sketch will be on its way to your inbox tonight. If you don't have it by morning email me direct at dzastrow -at- qwest -dot- net. I'm also forwarding a copy to Mike Morris who several months back graciously offered to review it and post it to the Repeater Builder web site. It's quite ironic in that the antenna I documented went aloft to 310 ft. today. It replaced an old DB224 which had developed a crackling noise when in duplex operation. The culprit was a winch line burn going halfway through the phasing harness as well as a cracked dipole. (Pics below.) My apologies for the sketch delay. I have been working 60-80 hour weeks the past three months and I put sleep ahead of completing the sketch. Hope it fills everyone's needs. Regards, Doug Zastrow, WBØUPJElkhorn Valley ARCNorfolk, Nebraska (Highly compressed and reduced picsas a courtesy to lo bandwidth users.) Winch Line Burn 01c901c5ff92$18738860$6401a8c0 Dipole Crack 01ca01c5ff92$18738860$6401a8c0YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] UHF Micor Mobile PA Question
John, You should be able to get 100 watts or better... but it won't last very long. Per Motorola's spec sheet the UHF mobile is rated at 35 watts maximum for continuos duty which is what a repeater does. The same ceramic PA sections are used in the Compa-Station but they are mounted on a heat sink that has one fifth the thermal resistance and they derate it to 75 watts output . Even at 35 watts out you will need fans on the outside heat sink and blowing right on the ceramic substrates. Micor PA's are well known for un-soldering their parts and generally not real reliable.You would be better off to totally bypass the four final PA transistors and use just the 45 watt PA driver stage. It will draw much less current and generate less heat with just the driver as compared to running the final PA at 45 watts.My thirty-two year old Micor mobile that was converted to a repeater twenty years ago was happy running 35 watts with fans until a recent lightning hit. It's repairable but I decided it had a good life replaced it with something more modern. So once again I'm running hardware that some else though was junk. Bruce WB6ARE On Aug 16, 2005, at 7:18 PM, John wrote: Hello group. I have just duplexed a 100 watt 450-470 Micor Mobile. Next I installed the crystal for 447.95 RX, with high side injection to give me 442.95 TX. The radio is now tuned up on frequency, but I am only getting about 65 watts output, max, at about 20 amps of current. I have double checked everything; LLA output OK, tried a 2nd re-tuned circulator, tried driving the radio with a signal generator connected to the RX injection cable (to be sure that I was really tuned to the right harmonic). Everything seems OK, so my question is how much power should you be able to get out of a 100 watt Micor on 442.95 Mhz?? Thanks for any info you can give. 73, John, k9KA 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/
[Repeater-Builder] Manual for VHF Mostar
I'm looking for a manual for a VHF Mostar, the display version is best but the NVR version will work too. I can pay via PayPal, cashiers check. Thanks in advance, Bruce WB6ARE Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
[Repeater-Builder] Wanted MIB schematic, Mostar Interface Box
MIBs are almost non-existant these days. Does anyone have a MIB schematic they are willing to share? Thanks in advance, Bruce WB6ARE Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
