Re: [Repeater-Builder] Re: Seeking emergency system design help
1) There is NO requirement to go digital 2) There is NO requirement to go 6.25 KHz. Yet. You can safely install an analog 12.5 KHz system and expect many years of use from it. By the time 6.25 has a firm use by date, you'll be looking to replace the current system anyway. Of course, you CAN use something like MotoTRBO or NexEdge f you don't mind paying a bit more. If this is truly an emergency type system, then you need professional design help, not just from this list. Bill KB1MGH From: n5qs ygr...@white-tiger.org To: Repeater-Builder@yahoogroups.com Sent: Fri, August 27, 2010 2:11:49 PM Subject: [Repeater-Builder] Re: Seeking emergency system design help Chuck Please abandon the idea of using D-Star equipment modified for non amateur use. First this is ILLEGAL. 2nd there is no commercial equipment that I am aware of that is compatible without modification. I would suggest using Kenwood Nextedge technology. This is very similar in performance to the D-Star and has a bandwidth of 6.25 KHz on a simplex radio (Mototurbo can not operate at 6.25 KHz without infrastructure) The FCC has already stated that the 6.25 KHz bandwidth is coming they just don't give any date prediction and I would not design a NEW system that did not comply directly with the ability to use this bandwidth. This is probably the most stable technology in todays market that can be set up with off the shelf equipment. I am too far away to help but would be glad to advise any legal way that I can. Roger --- In Repeater-Builder@yahoogroups.com, Chuck Kelsey wb2...@... wrote: I doubt that the D-Star amateur equipment (or any amateur equipment) is type-accepted for where you intend to use them. Chuck WB2EDV - Original Message - From: rudy_n2wq r_baka...@... To: Repeater-Builder@yahoogroups.com Sent: Thursday, August 26, 2010 1:08 PM Subject: [Repeater-Builder] Seeking emergency system design help Hello, I am looking for some advice or even a systems integrator who can help me design and implement an emergency communication system for my employer, using an off-the-shelf repeater and radios. My current thinking is to use D-Star radios and a D-star repeater, modified to work on non-amateur frequencies. Since the radios will be in Manhattan, the idea is to place the repeater in our Newark, NJ office and use directional antennas for the repeater. We are trying to prepare for the possibility of the entire building being damaged and thus the idea to move the repeater across the river. 73, Rudy N2WQ Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Seeking emergency system design help
Yes... 54-88 MHz cellphones would be cool. Back to the big old rubber ducks. LOL. From: Chuck Kelsey wb2...@roadrunner.com To: Repeater-Builder@yahoogroups.com Sent: Fri, August 27, 2010 3:15:39 PM Subject: Re: [Repeater-Builder] Re: Seeking emergency system design help You mean like making all the over-the-air TV stations buy new transmitters to go to DTV only to introduce a proposal to take over-the-air frequencies away to make them available to wireless (cellphone, etc.) Chuck WB2EDV - Original Message - From: MCH m...@nb.net To: Repeater-Builder@yahoogroups.com Sent: Friday, August 27, 2010 3:53 PM Subject: Re: [Repeater-Builder] Re: Seeking emergency system design help Interesting. A competing dealer is telling everyone they have to be using digital by 2013. Yes, of course it's a lie, but they no doubt make more on digital systems than they do analog. On the larger scope, I can't wait to hear the uproar when/if the FCC tells everyone who just purchased new SNFM equipment that they have to buy new equipment AGAIN. Joe M. Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Seeking emergency system design help
Thing is, the new stuff is pretty much disposable and not meant for the 20 year lifespan of the Motrac or Micor era. Compare a top end radio like an XTL5000, to a simple 4-freq PL Micor. Price tags are pretty close until you factor in inflation. From: MCH m...@nb.net To: Repeater-Builder@yahoogroups.com Sent: Fri, August 27, 2010 2:53:55 PM Subject: Re: [Repeater-Builder] Re: Seeking emergency system design help Interesting. A competing dealer is telling everyone they have to be using digital by 2013. Yes, of course it's a lie, but they no doubt make more on digital systems than they do analog. On the larger scope, I can't wait to hear the uproar when/if the FCC tells everyone who just purchased new SNFM equipment that they have to buy new equipment AGAIN. Joe M.
Re: [Repeater-Builder] Re: Seeking emergency system design help
Andy, my comment was not directed at the professionals, such as yourself and others I know personally that are on this list. They were based on his stated requirement for a disaster recovery radio system. It's not something to do cheap or without expert guidance. People keep commenting on losing range with narrowband systems. A large UHF LTR system I installed and maintained lost no discernable range switching from 5 KHZ to 2.5 KHz. All else was the same. Same antenna system, same repeaters, same mobiles. They just pushed a button to bring them to the new talkgroups. Bill KB1MGH From: Andrew Seybold aseyb...@andrewseybold.com To: Repeater-Builder@yahoogroups.com Sent: Fri, August 27, 2010 5:39:21 PM Subject: RE: [Repeater-Builder] Re: Seeking emergency system design help The FCC is re-thinking the move to 6.25 KHz based on the fact that narrow band systems (and I have done a few of them) lose about 30% of the existing coverage AND the NEW FCC believes that broadband is what it is all about in the future—no matter that broadband cannot do simplex or any of the other stuff needed for LMR and public safety. And like a few others have said on here—you have to narrowband but are NOT required to move to digital—P25 or anything else, I have just completed several systems which use analog and we have moved them from Wide to Narrow with no problems—EXCEPT the coverage problems I mentioned. Andy W6AMS (and btw there are professional LMR folks and consultants who work with this stuff every day on this list, just because we are hams too does not mean that we are not in the business as well)
Re: [Repeater-Builder] Re: DC Electrical Systems
The technology just wasn't there to make full use of DC. For long distance transmission, it beats AC but dropping it down from transmission to distribution and then to household voltages was very lossy. With the new solid state converter stations, it's very efficient and it makes transformation much easier if you are going between countries. The big HVDC line in New England is 900 KV. +450KV and -450 KV. It keeps things balanced and allows the use of smaller insulator strings. Bill KB1MGH From: lenaw12 wa1...@amsat.org To: Repeater-Builder@yahoogroups.com Sent: Thu, August 26, 2010 11:27:24 AM Subject: [Repeater-Builder] Re: DC Electrical Systems That IS interesting...the story behind the success of the Niagra Falls power plant was that Tesla was able to get his AC to travel far enough to feed Buffalo while Edison's DC wouldn't reach that far, so Tesla won the contract... NYC was powered by ConEdison and was therefore supplied with Edison's DC at 110v. Thus a market for the AA5 (all American 5) AC/DC tube radios. A million volts sounds like it might have solved the distance problems... LW --- In Repeater-Builder@yahoogroups.com, petedcur...@... wrote: Actually DC is the latest thing in power transmission. The gigantic Itaipu Hydroelectric plant is located on the River border between Paraguay Brazil and thus a shared project. Paraguay is 50HZ and Brazil is 60HZ. As such half the Alternators are 50HZ and the other half are 60HZ. But most of the generated power goes to Brazil. The 50HZ 60HZ AC is converted to DC and sent by a 1 million volt DC transmission line to Brazil then converted back to 60HZ in Brazil. Peter Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Adding capacitors to lower electric bill
The answer is simple. The electric company refuses to provide service to that location. Or, installs a tamperproof cover over the meter, relocates the meter up on the pole, or installs a new electronic meter. They can also go by historical use data for that property and sue the customer for it. From: Chuck Kelsey wb2...@roadrunner.com To: Repeater-Builder@yahoogroups.com Sent: Sun, August 22, 2010 12:11:38 PM Subject: Re: [Repeater-Builder] Adding capacitors to lower electric bill Power theft seldom goes undetected, I'll agree. and the punishment is severe. Not always. I can cite where a customer drilled hole in electric meter glass to allow an object to be inserted to prevent disk from spinning. Case presented to district attorney. No prosecution. Same customer did same thing with water meter later on. Same result with district attorney - no prosecution. Go figure. Chuck WB2EDV Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Motorola Maxtrac Help
Try a pull down resistor to ground. 1K or so maybe? From: ka9qjg ka9...@wowway.com To: Repeater-Builder@yahoogroups.com Sent: Sun, August 22, 2010 1:01:36 PM Subject: RE: [Repeater-Builder] Motorola Maxtrac Help He dos go in the Programming and Set it Low but still sees 5 Volts , He wants is Less which I guess is called Low He knows about and how to make up a little Ext Switching Transistor Ckt to invert it But rather be able to do it from the 16 Pin on back of the radio He wants to use it as some type of link . Well unfortunately I did not have a Answer , In My first question I accidently said High not Low and A Big Thanks to the people who have already sent Suggestions This is a follow up Question with more info . He also said He was told of anther Menu in the Radio to set it up too. I have a feeling the Radio has a Bad Switching transistor inn this Ckt . Thanks in Advance Don KA9QJG From:Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Richard W. Solomon Sent: Sunday, August 22, 2010 10:25 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Motorola Maxtrac Help In the RSS, hit F2, Radio Wide, then F9. You will see a list of pin-outs that you can select. One is PL/DPL CSQ Det. You can set it High or Low 73, Dick, W1KSZ ,___
Re: [Repeater-Builder] Adding capacitors to lower electric bill
The utility I used to work for did a lot of testing on the get free electricity devices over the years. None worked unless the customer had PF issues, even then, it didn't do much. That simple spinning disk electric meter is surprisingly accurate and hard to fool. Bill From: Chuck Kelsey wb2...@roadrunner.com To: Repeater-Builder@yahoogroups.com Sent: Fri, August 20, 2010 8:14:14 PM Subject: Re: [Repeater-Builder] Adding capacitors to lower electric bill That's my take, but someone on here insisted otherwise based on testing he had done. I spoke with an electrical engineer who said the same thing, but then he wondered out loud if it could be possible if the power factor was shifted to an extreme with a spinning disk meter. He opined that an electronic meter wouldn't be fooled. Of course shifting the PF to an extreme would be a basis for utility company action. Chuck WB2EDV - Original Message - From: Gary Schafer gascha...@comcast.net To: Repeater-Builder@yahoogroups.com Sent: Friday, August 20, 2010 9:06 PM Subject: RE: [Repeater-Builder] Adding capacitors to lower electric bill You won't see any difference. The electric meter reads true power not VA. 73 Gary K4FMX -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of Chuck Kelsey Sent: Friday, August 20, 2010 8:00 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Adding capacitors to lower electric bill A while back, maybe a year or two ago, there was a discussion on here where a list member had success adding a capacitor to his electric service which reduced his bill. It was debated for a while. Anyway, I am wondering if the utility company ever came and replaced the spinning disk meters with electronic versions, and if so, what the outcome was. Could the original poster respond either here or privately? I just today had a similar discussion with another ham who tried essentially the same thing with no success - only his was a commercial model, so it cost him considerably more. Chuck WB2EDV Yahoo! Groups Links Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3084 - Release Date: 08/20/10 14:35:00 Yahoo! Groups Links http://docs.yahoo.com/info/terms/
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] Polyphaser Question
The building has a steel support structure, I'm sure. You will need to bond to that as a start. Bill From: Eric Lemmon wb6...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Tue, August 17, 2010 11:30:03 PM Subject: RE: [Repeater-Builder] Polyphaser Question Ray, I suggest that you obtain the most recent edition (2011) of NFPA 780, the Standard for the Installation of Lightning Protection Systems, and install a proper lightning protection system for your antenna and mast per that document. It can be purchased for about $40, but you might find a copy in a municipal library. Please be aware that installing an antenna atop a building that has no lightning protection system installed may impose liability on you, if the antenna is not protected by a proper system and a fire or other damage occurs due to a lightning strike. In some landmark cases, the insurance company declined to pay for damages resulting from a poorly-designed and/or -installed LP system. Choose wisely... 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Ray Brown Sent: Tuesday, August 17, 2010 8:55 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Polyphaser Question What do you do when you want to install a small UHF linking repeater on a 4-story building that has no lightning protection on its roof? (this is to link an ambulance at a hospital to its base repeater 40 miles away) From what I've heard, it may not be a good idea to hook it to the HVAC, either. (sigh) Ray, KB0STN Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] unsubscribe
What link? From: Richard gbis-reply-...@gbis.com To: Repeater-Builder@yahoogroups.com Sent: Fri, August 13, 2010 11:35:07 PM Subject: RE: [Repeater-Builder] unsubscribe Well, I think it's funny. Richard, N7TGB www.n7tgb.net The problem with socialism is that eventually you run out of other people's money --Margaret Thatcher From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Kenneth Cook Sent: Friday, August 13, 2010 9:27 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] unsubscribe This is an experiment to see if I could make the link stand out. This is NOT to start problems! 73…de Ken Cook , W8DZN Switch to: Text-Only, Daily Digest • Unsubscribe• Terms of Use .
Re: [Repeater-Builder] Re: Mastr II drift problem
Is the Icom an EC model? If so you need to have at least a 5C plugged in to compensate it. Preferably a 2C on transmit. EC = External Compensation. 5C=5 ppm stability and 2C= 2 ppm. You can also check the pins on the exciter board, they have a history of being cold soldered or breaking loose. As a matter of course, I'd resolder all of them while you are in there. Bill From: Stanley Stanukinos ka5...@swbell.net To: Repeater-Builder@yahoogroups.com Sent: Tue, August 3, 2010 8:06:53 PM Subject: RE: [Repeater-Builder] Re: Mastr II drift problem Next thing look at the comp voltage going to the tcxo it comes off of the 10v reg card. Have you checked or swapped it yet? From:Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of steve Sent: Tuesday, August 03, 2010 8:06 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Mastr II drift problem Hi Stan, Yes I sent the crystals to International. I have 3 fans running full time on the heat sink. Thanks for any help! Steve --- In Repeater-Builder@yahoogroups.com, Stanley Stanukinos ka5...@... wrote: Did you just buy the crystals and insert them in the ICOMs or did you send them in to the crystal MFG to be compensated. If you did them yourself the compensation is probably now messed up. The best way to fix it is to send them in to the crystal MFG for compensation. Stan From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of steve Sent: Tuesday, August 03, 2010 5:33 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Mastr II drift problem Hello all, I have having a severe drift problem on my GE Mastr II 2 meter repeater. The transmit freq will drift nearly 2 KHZ over a 5-10 minute period. I have changed exciters and used a different ICOM but no improvement. The building that I am in is not ventilated and is very very hot. I put a high/low thermometer in and one day the high temp in the building was 114 degrees. Is this the problem? Thanks for any help. Steve W4SEF
Re: [Repeater-Builder] Re: GMRS Radio
Where is that written? Nothing that I see in the rules covering ERP except a maximum TX power out of 50 watts under 47CFR95.135 From: Dick rert...@ix.netcom.com To: Repeater-Builder@yahoogroups.com Sent: Mon, August 2, 2010 10:31:24 PM Subject: Re: [Repeater-Builder] Re: GMRS Radio Bear in mind that GMRS XMT power is limited to 40 watts ERP. Dick -Original Message- From: cmr359 Sent: Jul 30, 2010 8:29 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: GMRS Radio Most lmr radios will program gmrs frequencies. Be mindful of output power programmed as most will do over the limit. Many ameuter radios with transmitter mods will also do this. My radio vendor of choice is Icom. They are very tough with mil specs and all. --- In Repeater-Builder@yahoogroups.com, Joel joellan...@... wrote: Anybody have any reviews or maybe a used GMRS radio? I would like a 4 watt radio. Is the FCC doing in with GMRS repeaters? Does anybody have them for sale? Do they make a portable repeater?
Re: [Repeater-Builder] Narrowbanding
What's nastier is T-band sharing. WCVB in Boston on channel 20 routinely hammers a number of 500 MHZ public safety systems in New Jersey. From: Milt men...@pa.net To: Repeater-Builder@yahoogroups.com Sent: Tue, August 3, 2010 6:56:05 AM Subject: Re: [Repeater-Builder] Narrowbanding That may be what the mask specifies. I have seen the curve plots of the mask. Now run the numbers and see what kind of signal levels that really equates to when the DTV station is running say 1 MW. It looks pretty on paper, it's not so pretty in the real world. - Original Message - From: Glenn Little WB4UIV glennmaill...@bellsouth.net To: Repeater-Builder@yahoogroups.com Sent: Monday, August 02, 2010 11:23 PM Subject: Re: [Repeater-Builder] Narrowbanding I do not know about Nextel, but, the US DTV signal fits into a 6 MHz bandwidth. We use a mask filter to ensure that the bandwidth is no more than 6 MHz. 500 kHz from band edge = -47 dB 6 MHz from band edge = -110 dB 73 Glenn WB4UIV At 10:58 AM 8/2/2010, you wrote: On 8/2/2010 10:45 AM, Scott Zimmerman wrote: I was wondering about that myself. The bandwidths spec'd just didn't seem to compute in my feeble mind. Scott Scott Zimmerman Amateur Radio Call N3XCC 474 Barnett Road Boswell, PA 15531 Jeff DePolo wrote: Florida Repeater Coordinator proposes narrowbanding: http://www.florida-repeaters.org/FRC%202meter%20narrowband%20p olicy%20released%207-18-10.pdf Apparently Carson's Rule works different in Florida than it does everywhere else. --- Jeff WN3A Course, wiki says Carson's rule is of little use in spectrum planning anyway...(http://en.wikipedia.org/wiki/Carson_bandwidth_rule). These must be the same people that think Nextel's iDen 6:1 TDMA format fits in a 25 KHz channel, or that think the US DTV standard fits in a 6 MHz channel...NOT! Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] dispatch consoles
The Telex stuff is solid. A pain to set up sometimes, but really nice. It's been out long enough that most of the bugs have been worked out. From: Jed Barton j...@jedbarton.com To: Repeater-Builder@yahoogroups.com Sent: Mon, July 19, 2010 4:31:17 PM Subject: RE: [Repeater-Builder] dispatch consoles give me an idea of an easy roip console. Any ideas? -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wd8chl Sent: Monday, July 19, 2010 9:08 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] dispatch consoles On 7/17/2010 12:47 PM, Bill Smith wrote: Used is false economy. You end with someone elses problems and high maintenance costs as well as downtime which is a bad thing for an ambulance company. The 4010 is a nice reliable system, much simpler than the RoIP stuff but not nearly as versatile. The nice part of RoIP is that by using internet connectivity, you can have it loaded on a laptop and set up dispatch anywhere there is an internet connection in the world. Bill The bad news is so can anyone else... Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] dispatch consoles
It uses a VPN. Not too easy to crack. From: wd8chl wd8...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Mon, July 19, 2010 8:07:33 AM Subject: Re: [Repeater-Builder] dispatch consoles On 7/17/2010 12:47 PM, Bill Smith wrote: Used is false economy. You end with someone elses problems and high maintenance costs as well as downtime which is a bad thing for an ambulance company. The 4010 is a nice reliable system, much simpler than the RoIP stuff but not nearly as versatile. The nice part of RoIP is that by using internet connectivity, you can have it loaded on a laptop and set up dispatch anywhere there is an internet connection in the world. Bill The bad news is so can anyone else... Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] dispatch consoles
Used is false economy. You end with someone elses problems and high maintenance costs as well as downtime which is a bad thing for an ambulance company. The 4010 is a nice reliable system, much simpler than the RoIP stuff but not nearly as versatile. The nice part of RoIP is that by using internet connectivity, you can have it loaded on a laptop and set up dispatch anywhere there is an internet connection in the world. Bill From: Jed Barton j...@jedbarton.com To: Repeater-Builder@yahoogroups.com Sent: Sat, July 17, 2010 1:32:14 AM Subject: [Repeater-Builder] dispatch consoles Hey guys, Thought i would throw this out there. The ambulance company i work for, we are thinking perhaps of putting in a dispatch console, we're so busy with calls, that it makes more sense, and we wanna do some more things. We're gonna have 3, possibly 4 channels. I was thinking perhaps a zetron 4010, but perhaps someone has another idea. Remember, we're dealing with dumb dispatchers, so simple is the name of the game, buttons no mouse to key the moc. I'm a big fan of the kiss theory, keep it simple stupid. We may possibly send off 2 tones on one of our channels. Any thoughts? My thought was perhaps to look for a used console, not sure what these consoles go for new. Any ideas? Thanks, Jed Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Proto boards
Try Nuts Volts magazine, thy might have what you need. www.nutsvolts.com From: Ralph S. Turk w7...@comcast.net To: Repeater-Builder Repeater-Builder@yahoogroups.com Sent: Tue, July 6, 2010 2:16:47 PM Subject: [Repeater-Builder] Proto boards Hi All Looking for small etched, maybe drilled, small boards with layout for several transistors, resistors etc all isolated pads Also looking for ones that have layouts for 8pin, 14 pin or 16 pin dip with isolated pads for hook up I have some misc of the above and they are great for inverters, buffers, little op amps for increasing the level of the disc or tx audio. Any ideas? Ralph
Re: [Repeater-Builder] More on GMRS - Fwd: FCC NPRM proposes complete part 95 rewrite
What is the ERP of a typical 4-watt UHF portable? Pretty close to 2-watts. Bill KB1MGH From: Mike Morris wa6...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Tue, June 8, 2010 6:00:53 PM Subject: [Repeater-Builder] More on GMRS - Fwd: FCC NPRM proposes complete part 95 rewrite Date: Tue, 08 Jun 2010 20:06:17 - Subject: FCC NPRM proposes complete part 95 rewrite Just released FCC NPRM proposing a complete rewrite of the entire Part 95 Rules: NPRM FCC-10-106A1 The FCC NPRM requests comment and discussion of their proposed changes, which, among other things, propose to end the requirement for licensing in GMRS, LOWER the power allowed (to 2 watts for portables), potentially remove repeaters, firmly prohibit scrambling of any kind, and perhaps, prohibit use of radios dual/type accepted for part 90 and 95!
Re: [Repeater-Builder] Transformer cores
You need to be careful with Beeswax. it can hold the core tight enough that you break it. From: Chuck Kelsey wb2...@roadrunner.com To: Repeater-Builder@yahoogroups.com Sent: Sat, May 29, 2010 11:46:19 AM Subject: Re: [Repeater-Builder] Transformer cores I've always heard about inserting a small diameter piece of rubber band in between, but have never found anyone that actually had it work. If it were me, I'd get some bees wax, melt it, and quickly dip the core in it using a tuning tool so as not to coat the innards. This would put a small coating of bees wax on it, increasing the diameter and making it a bit sticky. That said, I've never done any procedure. Chuck WB2EDV - Original Message - From: Doug Hutchison specialq@ntlworld.com To: repeater-builder@yahoogroups.com Sent: Saturday, May 29, 2010 12:37 PM Subject: [Repeater-Builder] Transformer cores Hello, Got situation where the 'elastic' or whatever inside RX IF transformer has disintegrated through age allowing ferrite core to drop to bottom thus negating adjustment. What successful fixes have been found for such a problem which will continue to allow adjustment yet not jam the core? Doug - GM7SVK Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Just curious... Microwave frequencies
Microwave is having a resurgence in popularity. with the demand for wireless data increasing and cellular networks becoming all digital, Microwave is being used where it will be cost-prohibitive to install fiber. Companies like Fiber Tower are providing microwave backhaul for some cellular companies and instead of paying tens or even hundreds of thousands to pull in fiber, they throw in a microwave link for $10,000-$15,000. The microwave equipment of today is nothing like it used to be. The 11 GHz links I have are tower mounted radios and bolt right onto the back of the dish. They have four separate radios built in for redundancy and only need a single cat-5 cable to feed power and signal to them. From: La Rue Communications laruec...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Wed, May 12, 2010 11:50:28 AM Subject: Re: [Repeater-Builder] Just curious... Microwave frequencies So in a nutshell, microwave is a band of precision and pinpoint accuracy? Common sense that people shouldnt use wood for anything outside that demands long-term stability. Not only do the elements cause warping, but also prone to termites, etc. Wow! Thanks for all the good input! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn - Original Message - From: DCFluX To: Repeater-Builder@yahoogroups.com Sent: Wednesday, May 12, 2010 9:43 AM Subject: Re: [Repeater-Builder] Just curious... Microwave frequencies Generally microwave is used for point to point communications such as intercity links for telephone and studio to transmitter links for television and radio stations. The power generated by the transmitter is fairly low in the 10-100mW range but the antenna gain of a dish is extremely high 30-40dB depending on frequency and size of the dish, making a 100mW transmitter have an ERP that is 100 - 1000W. With that being said it is probably not a good idea to hang around the appreture of the dish while one of these systems is running. These frequencies are a challange because of the water vapor and rain really like to absorb them and with antenna gain that high the beam width is extremely narrow. I have a 6ft cookie that is .8 degrees wide. Longest path I saw was 65 miles on 12 GHz, had 15 foot dishes on both ends. Normal towers have a tendency to twist depending on wind and temperature variations so its a good idea to mount the dishes with super thick poles directly into the ground with concrete. The local cable company put a system on 24 GHz that went 1 mile. worked great until it rained and got humid, they mounted the dishes on wooden phone poles and they twisted to the point where the link quit working. On Wed, May 12, 2010 at 9:32 AM, La Rue Communications laruec...@gmail. com wrote: With that being said, how popular is the rest of the microwave band? Is it one of the more dangerous bands if used improperly? John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl. com/2dtngmn - Original Message - From: DCFluX To: Repeater-Builder@ yahoogroups. com Sent: Wednesday, May 12, 2010 9:27 AM Subject: Re: [Repeater-Builder] Just curious... Microwave frequencies No 800 band for hams, closest is 902-928 which is the 33cm ham band, it is also used by ISM type devices such as cordless phones, baby monitors, 802.11 internet and wireless video senders. 10 S. Aurora Street Stockton, CA 95202 http://tinyurl. com/2dtngmn
Re: [Repeater-Builder] How About This One?
It's an attenuator. They were used in control stations to keep their power in compliance with the 6dB rule. From: La Rue Communications laruec...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Tue, May 11, 2010 12:31:51 PM Subject: [Repeater-Builder] How About This One? Not sure what this is either. The part numbers turn up nothing in google. Not sure if its even a Motorola product. Has no Moto stamping. Might be something else that someone may be familiar with. The number on the side thats etched in reads 15B84073D01. Thanks for your help! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn
Re: [Repeater-Builder] fcc violation notice???
Recon Scout is one that just received FCC approval for video in the 439 MHz area. From: Kris Kirby k...@catonic.us To: Repeater-Builder@yahoogroups.com Sent: Fri, April 30, 2010 12:33:24 AM Subject: Re: [Repeater-Builder] fcc violation notice??? On Thu, 29 Apr 2010, Kirk Just Kirk wrote: For some odd reason POLICE DEPTS. think they are exempt from any frequency co-ordination!! There is one Law Enforcement agency here in Las Vegas that has a Robot device that receives it's commands on 154.570Mhz !!! WHAT THE HELL WERE THEY THINKING This freq is MURS-4, it's unlicensed, but it IS a licensed channel used by damn near every fast food eatery for it's drivethru window!! Can you possibly think of a poorer choice of RF freq to control a Robot on Dont get me started on the fact they use 439.250Mhz for the Video feeds!!! besides it being used for HAM ATV it's a very common cable TV channel!! What manufacturer makes this robotic device? -- Kris Kirby, KE4AHR Disinformation Analyst Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Strange Signal on 158.275(ish)
Sounds like some SCADA stuff I've heard in the past. From: Mike Besemer (WM4B) mwbese...@cox.net To: Repeater-Builder@yahoogroups.com Sent: Wed, April 28, 2010 5:19:59 PM Subject: [Repeater-Builder] Strange Signal on 158.275(ish) Can anybody identify the signal in the attached file? It appears on 158.275 +/- 5 KHz or so. I set my receiver to AM mode for this recording. It does appear in FM and NFM, but not as clearly. Note that the PRF is not fixed... it does vary over time. It is audible over a fairly large (10 - 12 miles that I've checked so far) area. I doubt that is has anything to do with the pager interference I've been having, but it does happen to be just about half of our suspected mix frequency of around 316.6 MHz. Thanks, Mike WM4B Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: how far
Depending on the frequency of the site, they might only be putting out 5 watts of transmit power. Rural sites run more power, and taller antennas to get better range. In a City, they just don't need or want huge amounts of power because it will prevent reuse of the frquencies or cause what's called pilot pollution. From: George gueorg...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Sun, April 25, 2010 2:13:22 PM Subject: [Repeater-Builder] Re: how far what do you mean...a cell site in the city radiates much more times than my antenna, its on the same level and shoots directly in peoples houses... --- In Repeater-Builder@yahoogroups.com, Al Wolfe k...@... wrote: Sounds like George might be living in a microwave oven. Maybe time to do an RF exposure test? Al, K9SI Re: how far Posted by: George gueorg...@... gueorgui2 Date: Sat Apr 24, 2010 5:45 pm ((PDT)) ok the antenna is from cell site 14dbm 4-element in a plastic housing, the amplifier is 600 watts capable linear mosfet 8element hybrid splitters and combiners... but the power supply is up to 65 ampers at 24 volts, driven by a C class 130 watt amplifier. the antenna is not on a commercial tower (no luck here). 20 feet above the house. the line is heliax andrew semi-rigid. the repeater is in the attic and the line is 30feet. the duplexer is celwave doesn't like more than 450 watts in. Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Frequency Listing Sites
www.radioreference.com is about the best out there. From: La Rue Communications laruec...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Fri, April 23, 2010 11:09:11 AM Subject: [Repeater-Builder] Frequency Listing Sites Hi Folks - Are there any reliable and up to date frequency listings for County Agencies (i.e. Sheriff / Fire / EMS)? I am planning a trip down to Los Angeles from Stockton (San Joaquin) for the weekend with my family and I would like to build a scanner using a UHF Saber and a VHF Saber. These do not have scan capabilities - So its manual channel switching for me! I would love to include the CHP on there too but I have no portables that are functional that will tune down to the Low Band Range (Much to my heart's dismay). Unless there is a way to tune Sabers to their Receive frequency. Right now I am looking at http://www.freqofnature.com and wanted to pick your brains on that site. Is it good, trustworthy? Reliable? Any HAM repeaters in that range that I can listen in to as well? Since I am hard of hearing, it takes a bit of training my ears to properly identify words without seeing lips. So that helps too! Thanks a Ton! Cheers! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn
Re: [Repeater-Builder] OT: Motorola Spectra Astro VHF or UHF?
www.batlabs.com is your friend. All the info you require. From: La Rue Communications laruec...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Thu, April 22, 2010 7:28:08 PM Subject: [Repeater-Builder] OT: Motorola Spectra Astro VHF or UHF? Hi Gang - I have an Spectra Astro beleived to be a UHF. As you can see from the picture, this is a two peice unit. Radio pack and control head. I looked through the RB Archives, extensively but only found Astros that are one peice. (Control head built in) This is a former Police radio that I am trying to locate the band split. A Google search turned up something on RadioReference.com specifying it was a VHF 146-178, but that was a bit sketchy. I want to be absolutely certain what split that this radio covers. We thought it was a UHF 450-470 split, but now moreso Im stumped. Model number is: T04KLF9PW5AN FCC ID: AZ492FT3773 Thanks for your input, no matter how small! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 http://tinyurl.com/2dtngmn
Re: [Repeater-Builder] Motorola R100 lowband on 6?
I was a Radius dealer for quite a few years and only saw VHF and UHF R100 versions. Bill KB1MGH From: cruizzer77 atlant...@gmx.ch To: Repeater-Builder@yahoogroups.com Sent: Wed, April 21, 2010 5:50:45 PM Subject: [Repeater-Builder] Motorola R100 lowband on 6? Hi Does anyone know of a lowband R100 that has successfully been converted to 6m? 73 Martin Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Zetron Controller Connector-Source
They are made by Phoenix Contacts. you can get them from Mouser. Bill KB1MGH From: tracomm trac...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Mon, April 12, 2010 12:32:48 PM Subject: [Repeater-Builder] Zetron Controller Connector-Source Any one have a source for the Zetron interface connector (orange 15 pin) used on most versions, 38, 38A, 38 Max ?? GMRSINC Yahoo! Groups Links http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Motorola Radius P50
The P50's came in several models. Low power in the short housing, high power in the tall. As was mentioned before, the battery voltage was different for the two models. It was only capable of one or two channels max. Under the battery was an adaptor board with the charging polarity protection diode. Peel it up and that's where the PL/DPL board lived. Same board for all models. EXCEPT... The P50+, a relatively rare P50 variant with a programmable PL/DPL/2-tone board. The program cable for that board was part of the Radius dealer package way back when. In all the years I was a Radius dealer, I never sold a P50+ or used the cable Not a spectacular radio, but I had a few Police departments that insisted on cheap radios and wanted the P50. Surprisingly reliable when new and parts were available. Bill -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wd8chl Sent: Friday, April 09, 2010 9:20 AM To: Repeater-Builder@yahoogroups.com Motorola Radius P50 On 4/8/2010 3:18 PM, La Rue Communications wrote: Two questions on this unit. 1) Does anyone know the nomenclature for this? I have checked out several different versions, including one that was built for assignments dated after 3/10/02. I tried to check it out with it, however, it doesnt match up when it came to the power level code. So I scrapped that one. Google searches turn up a pair of them listed on eBay for 250 bucks. (Who are they kidding?) heh... Model number is H (For Handheld) 44GNU1120BN. I beleive it is a UHF, but I would like to know the rest of the specs, spacing, packages, etc. well, the second '4' means UHF, so yes, unless someone put a VHF radio in a UHF case... 2) One the same units, I have a Tall one and a Short one. Battery sizes are clearly the differing factor. Does that mean Power levels come into play here? scratches head Isn't a P50 the cheapy xtal radio from the early 90's? Maybe 4-channel tops? If so, the 'tall' vs. 'short' was carrier squelch vs. PL/DPL. So yes, that means converting a CSQ radio to PL means changing the case... And no, these are NOT narrowbnad compatible, so they have no value in Part 90. And they were pretty cheap, flimsy radios, hard to work on, easy to break, I wouldn't take one for free... Land fill... Yahoo! Groups Links
Re: [Repeater-Builder] Motorola Radius P50
Pry marks? Pop out the two clips in the battery compartment and pull up on the antenna. No prying needed! :-) From: La Rue Communications laruec...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Fri, April 9, 2010 11:10:10 AM Subject: Re: [Repeater-Builder] Motorola Radius P50 Landfill - For sure! (If they're not working) These have the UHF frequency still adhered to the battery panel, so I have very strong reason to beleive these are UHF and not VHF hiding in a UHF case. Doesnt appear to be tampered with or pry marks indicating it was opened before. (Thank goodness). I really hope I dont have to PAY anyone to take these off my hands in the future! I just noticed I *STILL* have my Tall Radius P50+ with a numeric touchpad still sitting on my shelf I thought I got rid of MONTHS ago. Its come back to haunt me!! (Anyone want it?) :) John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 - Original Message - From: wd8chl To: Repeater-Builder@yahoogroups.com Sent: Friday, April 09, 2010 7:20 AM Subject: Re: [Repeater-Builder] Motorola Radius P50 On 4/8/2010 3:18 PM, La Rue Communications wrote: Two questions on this unit. 1) Does anyone know the nomenclature for this? I have checked out several different versions, including one that was built for assignments dated after 3/10/02. I tried to check it out with it, however, it doesnt match up when it came to the power level code. So I scrapped that one. Google searches turn up a pair of them listed on eBay for 250 bucks. (Who are they kidding?) heh... Model number is H (For Handheld) 44GNU1120BN. I beleive it is a UHF, but I would like to know the rest of the specs, spacing, packages, etc. well, the second '4' means UHF, so yes, unless someone put a VHF radio in a UHF case... 2) One the same units, I have a Tall one and a Short one. Battery sizes are clearly the differing factor. Does that mean Power levels come into play here? scratches head Isn't a P50 the cheapy xtal radio from the early 90's? Maybe 4-channel tops? If so, the 'tall' vs. 'short' was carrier squelch vs. PL/DPL. So yes, that means converting a CSQ radio to PL means changing the case... And no, these are NOT narrowbnad compatible, so they have no value in Part 90. And they were pretty cheap, flimsy radios, hard to work on, easy to break, I wouldn't take one for free... Land fill...
Re: [Repeater-Builder] Motorola Radius P50
No offense to anyone here implied. I've been down the road many times over the years trying to open devices without destroying them. Bill From: MCH m...@nb.net To: Repeater-Builder@yahoogroups.com Sent: Fri, April 9, 2010 2:11:12 PM Subject: Re: [Repeater-Builder] Motorola Radius P50 But, how many people know that? I think his point was that it doesn't seem to have been played with by someone who didn't know at least somewhat what they were doing. I've seen some of those come in. Joe M. Bill Smith wrote: Pry marks? Pop out the two clips in the battery compartment and pull up on the antenna. No prying needed! :-) Doesnt appear to be tampered with or pry marks indicating it was opened before. (Thank goodness). Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Motorola Radius P50
It's a 4-watt UHF carrier squelch radio. Uses crystals Short ones are 2-watt units. PL or DPL boards fit under the plate in the battery compartment. From: La Rue Communications laruec...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Thu, April 8, 2010 2:18:10 PM Subject: [Repeater-Builder] Motorola Radius P50 Two questions on this unit. 1) Does anyone know the nomenclature for this? I have checked out several different versions, including one that was built for assignments dated after 3/10/02. I tried to check it out with it, however, it doesnt match up when it came to the power level code. So I scrapped that one. Google searches turn up a pair of them listed on eBay for 250 bucks. (Who are they kidding?) Model number is H (For Handheld) 44GNU1120BN. I beleive it is a UHF, but I would like to know the rest of the specs, spacing, packages, etc. 2) One the same units, I have a Tall one and a Short one. Battery sizes are clearly the differing factor. Does that mean Power levels come into play here? Thanks in advance! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202
Re: [Repeater-Builder] Motorola Radius P50
The dip switches are for programming the PL/DPL board only From: La Rue Communications laruec...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Thu, April 8, 2010 5:10:00 PM Subject: Re: [Repeater-Builder] Motorola Radius P50 Thanks Bill, am I to assume that the dip switches under the plate in the battery compartment are for a whole other function other than programming, or are those a part of the PL / DPL boards that I see? John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202 - Original Message - From: Bill Smith To: Repeater-Builder@yahoogroups.com Sent: Thursday, April 08, 2010 3:02 PM Subject: Re: [Repeater-Builder] Motorola Radius P50 It's a 4-watt UHF carrier squelch radio. Uses crystals Short ones are 2-watt units. PL or DPL boards fit under the plate in the battery compartment. From: La Rue Communications laruec...@gmail. com To: Repeater-Builder@ yahoogroups. com Sent: Thu, April 8, 2010 2:18:10 PM Subject: [Repeater-Builder] Motorola Radius P50 Two questions on this unit. 1) Does anyone know the nomenclature for this? I have checked out several different versions, including one that was built for assignments dated after 3/10/02. I tried to check it out with it, however, it doesnt match up when it came to the power level code. So I scrapped that one. Google searches turn up a pair of them listed on eBay for 250 bucks. (Who are they kidding?) Model number is H (For Handheld) 44GNU1120BN. I beleive it is a UHF, but I would like to know the rest of the specs, spacing, packages, etc. 2) One the same units, I have a Tall one and a Short one. Battery sizes are clearly the differing factor. Does that mean Power levels come into play here? Thanks in advance! John Hymes La Rue Communications 10 S. Aurora Street Stockton, CA 95202
Re: [Repeater-Builder] To Hear Clear,or not to Hear Clear......
You might check out the near-900 group on googlegroups. To hearclear or not has been a running discussion on the New England 900 MHz network with the general consensus that it's not worth using. Bill KB1MGH From: Mark n9...@ameritech.net To: Repeater-Builder@yahoogroups.com Sent: Thu, April 1, 2010 1:38:19 PM Subject: RE: [Repeater-Builder] To Hear Clear,or not to Hear Clear.. Scott, I have HearClear enabled on my machine. I also have users with non-Motorola (i.e., Kenwood and EF Johnson) radios. They sound fine to me, so I believe the HearClear CODEC works to improve radio with the option enabled, but does not adversely affect radios without it. Mark - N9WYS 927.5250 (151.4) - Joliet, IL -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of kq7dx Sent: Thursday, April 01, 2010 2:10 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] To Hear Clear,or not to Hear Clear.. Hello to group, A thanks to the group for all the help to my prior posts. Your time to post and reply was very much appreciated thanks!!. Well my question here was on hear clear... I have noticed some repeaters back east use it. In the menu you can enable it for any channel in your radio, and disable it for other repeaters that dont use it, so channel specific is good. The only negative I saw was that it would probably only work on Motorola radios and the Johnson or Kenwoods would not benefit or maybe sound poor to them. But since most the guys in my city use Motorola [GTX, Spectra,Maxtrac]I didnt see that as a problem. So Is there anyone using it in their repeater that can tell me if it is worth doing. Does it really improve the audio. At 2.5kc Dev we could use a compander for the weak voices. Thanks again and 73s Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.800 / Virus Database: 271.1.1/2783 - Release Date: 04/01/10 01:35:00 Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Helix / Connectors
It's what Andrew calls Heliax 2.0 AVA, Andrew Virtual Air and AVAL Andrew Virtual Air Aluminum. They are using a new lower density foam and thinner copper to get slightly improved attenuation. Stay away from the aluminum stuff, the corrugated shield is too thin and brittle. It's hard to install connectors on and it doesn't bend very well. Been there too many times already, got the hat but not the T-Shirt. ;-) Bill KB1MGH DCFluX wrote: The connectors should be fine, I wouldn't trust the aluminum feedline. You may want to try using an anti-oxidation compound, such as No-Ox or Aluminum Ox-Gard during assembly. Aluminum Heliax? Never heard of it. I didn't get the beginning of this thread...
Re: [Repeater-Builder] Amphenol Connex RF connectors
The Connex line is the cheapie line. It's still better than the real cheap imported crap, but as the price indicates, nowhere near the quality of the main mil-spec products. That said, I use quite a bit of the Connex stuff unless it's a critical application. You do get what you pay for. Bill KB1MGH From: James Cicirello ka2...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Tue, March 9, 2010 11:41:55 AM Subject: Re: [Repeater-Builder] Amphenol Connex RF connectors IMHO Amphenol Connectors are hard to beat and I personally do not know of any better. Especially when it comes to adapters they will outlast the cheapies many times over. Even when they discolor because of years of service, they still work good. Having said that I shop economy because of ham use, but it depends on where I put the connectors that makes me choose the quality. If you are going to hire a climber to put up an antenna you want the best connector or adapter in the air and again I believe that would be Amphenol. Good Luck JIM KA2AJH On Mon, Mar 8, 2010 at 1:05 PM, la88y llhorl...@gmail.com wrote: Anyone care to comment on the quality of the Amphenol Connex line of RF connectors? They have a pretty good price point, but only if they aren't junk. lh -- Jim Cicirello 181 Stevens Street Wellsville, N.Y. 14895 (585)593-4655 The Connex line is their cheapy
Re: [Repeater-Builder] Amphenol Connex RF connectors
Somewhat. Pricey but very good quality. From: Larry Horlick llhorl...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Tue, March 9, 2010 7:30:38 PM Subject: Re: [Repeater-Builder] Amphenol Connex RF connectors Bill, Are you familiar with Huber+Suhner? lh On Tue, Mar 9, 2010 at 8:26 PM, Bill Smith brsc...@yahoo.com wrote: The Connex line is the cheapie line. It's still better than the real cheap imported crap, but as the price indicates, nowhere near the quality of the main mil-spec products. That said, I use quite a bit of the Connex stuff unless it's a critical application. You do get what you pay for. Bill KB1MGH From: James Cicirello ka2...@gmail.com To: Repeater-Builder@yahoogroups.com Sent: Tue, March 9, 2010 11:41:55 AM Subject: Re: [Repeater-Builder] Amphenol Connex RF connectors IMHO Amphenol Connectors are hard to beat and I personally do not know of any better. Especially when it comes to adapters they will outlast the cheapies many times over. Even when they discolor because of years of service, they still work good. Having said that I shop economy because of ham use, but it depends on where I put the connectors that makes me choose the quality. If you are going to hire a climber to put up an antenna you want the best connector or adapter in the air and again I believe that would be Amphenol. Good Luck JIM KA2AJH On Mon, Mar 8, 2010 at 1:05 PM, la88y llhorl...@gmail.com wrote: Anyone care to comment on the quality of the Amphenol Connex line of RF connectors? They have a pretty good price point, but only if they aren't junk. lh -- Jim Cicirello 181 Stevens Street Wellsville, N.Y. 14895 (585)593-4655 The Connex line is their cheapy
Re: [Repeater-Builder] Re: LMR Cable
Passive Intermodulation. Things like rusty hardware or disimilar metals can cause it in the presence of RF. From: rffun radio...@her.forthnet.gr To: Repeater-Builder@yahoogroups.com Sent: Sun, March 7, 2010 2:33:33 PM Subject: [Repeater-Builder] Re: LMR Cable LMR and similar cables are not rated for low PIM What exactly do you mean by PIM ? rffun --- In Repeater-Builder@yahoogroups.com, Larry Horlick llhorl...@... wrote: Indeed. I'll read the archives. Thanks. 73 On Sun, Feb 28, 2010 at 8:59 PM, Chuck Kelsey wb2...@... wrote: The subject comes up on this list about every other week. I can only assume you are new. LMR and similar cables are not rated for low PIM, a fact verified by the manufacturer. Chuck WB2EDV - Original Message - *From:* Larry Horlick llhorl...@... *To:* Repeater-Builder@yahoogroups.com *Sent:* Sunday, February 28, 2010 8:49 PM *Subject:* Re: [Repeater-Builder] Micor Stock Power Supplies I've never heard of it. As an installer, I'm always under pressure to use less expensive feedlines than the venerable Heliax, and I had often considered LMR, but never actually succumbed to the temptation. This is interesting information. Is this a well documented phenomenon? Anyone else like to chime in on this... Larry Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Two coax and connector questions
Check www.therfc.com They have reverse polarity and reverse thread connectors From: Glenn Little WB4UIV glennmaill...@bellsouth.net To: Repeater-Builder@yahoogroups.com Sent: Wed, March 3, 2010 8:11:21 PM Subject: Re: [Repeater-Builder] Two coax and connector questions Reverse threaded connectors are used to get a piece of equipment past FCC type acceptance. The type acceptance paper work specifies the antenna that is used for acceptance. Any other antenna voids the type acceptance. Since reverse threaded connectors are not available to the general public, the FCC bought off on this to prevent the antenna from being changed. Another trick that is used is a connector with the wrong sex center conductor pin. 73 Glenn WB4UIV At 06:08 PM 3/3/2010, you wrote: Hey guys, I was wondering if you all would entertain two questions that I have. First, what is the purpose/use of reverse polarity coax connectors such as SMA and TNC? I assume there are others but those are the ones I have seen. Secondly, I ran across something regarding using small diameter heliax in a mobile environment. I had never heard of that before and it seemed like it would be prone to vibration problems. I am probably wrong though. Anyone care to shed some light on that subject? Thanks Albert Yahoo! Groups Links Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Two coax and connector questions
In the early days of 800 MHz land mobile, 1/4 superflex was used in mobiles (trucks) with runs longer than 15 feet. they went to the fin type transit antenna so connectors were used on both ends. From: wb6dgn tallins...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Thu, March 4, 2010 8:25:08 AM Subject: [Repeater-Builder] Re: Two coax and connector questions The only thing I found on the Tessco site was under non Motorola Mounts listed as: 800-1990 MHz 17 feet No connector supplied ProFlex Plus Not familiar with that cable but it doesn't look like a heliax variation. As someone else noted, the smaller heliax sizes probably could be adapted pretty easily but I'm curious why? --- In Repeater-Builder@yahoogroups.com, Chris Curtis demo...@... wrote: Did you see annular heliax or a superflex variant? The superflex varieties give more flex hence the name and should hold up in a semi flex environment of a mobile. Annular corrugation looks like the bellows of a shock absorber boot while the superflex variants look like the threads of a screw. [the shield] 3/8 inch superflex is soldered into a normal pl-259 quite often so I'm sure someone has used it in a mobile at one point or another. 'bout all I can help you with on the heliax in a mobile installation. Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of wb6dgn Sent: Thursday, March 04, 2010 5:37 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Two coax and connector questions So what about the other question?.. using heliax in mobile installation What frequency? What power? What type of antenna mount?, and antenna? --- In Repeater-Builder@yahoogroups.com, hitekgearhead hitekgearhead@ wrote: Really?. is that the real purpose of reverse-polarity connectors? I am quite flabbergasted.. So what about the other question?.. using heliax in mobile installations? Thanks Albert --- In Repeater-Builder@yahoogroups.com, Glenn Little WB4UIV glennmaillist@ wrote: We all know that they are available. But, this is the way out to get the type acceptance. The FCC is all lawyers with no technical people on staff. 73 Glenn WB4UIV At 09:27 PM 3/3/2010, you wrote: Actually, RP-type (RP-SMA, RP-TNC, etc.) connectors are very easily available to the general public. wlan-parts.com oddcables.com etc, etc, etc. -Brian / KF4ZWZ On Wed, Mar 3, 2010 at 6:11 PM, Glenn Little WB4UIV glennmaillist@ wrote: Reverse threaded connectors are used to get a piece of equipment past FCC type acceptance. The type acceptance paper work specifies the antenna that is used for acceptance. Any other antenna voids the type acceptance. Since reverse threaded connectors are not available to the general public, the FCC bought off on this to prevent the antenna from being changed. Another trick that is used is a connector with the wrong sex center conductor pin. 73 Glenn WB4UIV At 06:08 PM 3/3/2010, you wrote: Hey guys, I was wondering if you all would entertain two questions that I have. First, what is the purpose/use of reverse polarity coax connectors such as SMA and TNC? I assume there are others but those are the ones I have seen. Secondly, I ran across something regarding using small diameter heliax in a mobile environment. I had never heard of that before and it seemed like it would be prone to vibration problems. I am probably wrong though. Anyone care to shed some light on that subject? Thanks Albert Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.435 / Virus Database: 271.1.1/2705 - Release Date: 03/03/10 19:34:00 Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
I know it's a quick and dirty way to go about it, but after nearly 20 years of operation, I can't complain. Besides, I had the parts in my junk box. Today, I'd go with an LM317. With age comes wisdom. And the money to do it right LOL! Bill KB1MGH From: n...@no6b.com n...@no6b.com To: Repeater-Builder@yahoogroups.com Sent: Sat, February 27, 2010 6:25:09 PM Subject: Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement? At 2/25/2010 12:36, you wrote: Build it yourself. Use an LM7808 and and series two 1N4001's to lift the ground lead up by 1.4 volts. I know 7809's are around but the 7808 is much more common and cheaper. One thing to watch out for in lifting the ground pin above ground on the 78xx series devices is that a momentary short of the output to ground can destroy the device, IOW the integral short circuit protection is effectively defeated. You'll also need to use insulating hardware if you want to heat sink the regulator by mounting it to the (grounded) chassis. The cleanest, easiest solution may simply be an LM317 set to 9.6 V output. Bob NO6B Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: LOOONG audio runs
Don't forget, CAT cables have different twist rates for each pair to minimize crosstalk between them. If one pair doesn't work, try another. From: larynl2 lar...@hotmail.com To: Repeater-Builder@yahoogroups.com Sent: Sun, February 28, 2010 12:27:53 PM Subject: [Repeater-Builder] Re: LOOONG audio runs A friend of mine full-time broadcast engineering told me he can detect zero crosstalk between pairs within the same CAT 5 cable at line level. As you suspect, balance is very important. Laryn K8TVZ --- In Repeater-Builder@yahoogroups.com, JOHN MACKEY jmac...@... wrote: Using balanced audio in a broadcast environment, I have on rare occasions experienced issues with cross-talk between long runs of un-shielded balanced audio lines. (inductive pickup??) I always wondered if the wires were truly balanced when that happened. I prefer to used shielded balanced wiring for long runs. Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] 900 meg Spectra radio
http://www.gemoto.com/900/coverage_NEAR900.htm This is a map of eastern Mass. 900 is very active especially with the linked repeaters. Bill KB1MGH From: Mark n9...@ameritech.net To: Repeater-Builder@yahoogroups.com Sent: Sun, February 28, 2010 12:47:33 PM Subject: RE: [Repeater-Builder] 900 meg Spectra radio Not necessarily true, John. There are pockets of HIGH activity on 900 MHz - especially on the coasts, where PAVE PAWS has forced the reduction or elimination of 70cm repeaters. Unfortunately, I'm not on either coast (I'm in the Chicago area) so your observation is accurate -- for me anyway. :-( Mark - N9WYS -Original Message- From: repeater-buil...@yahoogroups.com On Behalf Of JOHN MACKEY Because 900 Mhz is only available to amateurs in the US and not in Japan. The 900 Mhz amateur activity in the US is not very strong. -- Original Message -- Received: Sat, 27 Feb 2010 07:02:17 PM PST From: Fuggitaboutit mikewm9v SNIP Why cant someone just come up with a 900 meg fm mobile for amateur use? They would sell a zillion of them. Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement?
Build it yourself. Use an LM7808 and and series two 1N4001's to lift the ground lead up by 1.4 volts. I know 7809's are around but the 7808 is much more common and cheaper. Bill From: skipp025 skipp...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Thu, February 25, 2010 9:58:50 AM Subject: [Repeater-Builder] Re: Micor UHF Repeater Base 9.6 vdc current requirement? A'tank u viry much Less than 1 Amp is the good news... Now instead of building a 3 terminal LM-317 regulator circuit do we want to instead buy a pre-made complete regulator board off Ebay for about $7 and shipping? A main switcher power supply or off a site DC source and the electric bill from the Micor Power Supply should drop at least $20 per month. thank you! skipp
Re: [Repeater-Builder] Question for the group
Yes it can be done with the right stuff. We had several DB 4-port combiners feeding into a bandpass duplexer with a receive multicoupler on the other side of the duplexer. In our case, insertion loss was quite high due to close spaced frequencies, 75 KHz. Notch type filters will not do it. Now, if your budget can't afford 8K, Maybe we can make a deal on my Celwave 4-port combiner. Bill KB1MGH From: Maire-Radios maire-rad...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Mon, February 15, 2010 7:02:08 PM Subject: Re: [Repeater-Builder] Question for the group have been using TX RX for years on a number of tower sites. - Original Message - From: Brian Raker To: Repeater-Builder@yahoogroups.com Sent: Monday, February 15, 2010 7:59 PM Subject: Re: [Repeater-Builder] Question for the group Telewave Wireless will set you up with a 4-channel 450MHz 150 watt low-loss combiner for ~8k. http://www.telewave.com/pricelist/106-450combiners.html -Brian / KF4ZWZ On Sun, Feb 14, 2010 at 9:17 PM, k7...@skybeam. com wrote: We use many ham and commercial repeaters using the same antennas, but require the proper filtering. A mobile duplexer is not sutable for what you are trying to do here. You can get a transmit combiner Hybrid or cavity for the transmitters and use a receiver multicoupler that has a dual window one for the ham receive and one for the commercial receive or use a cavity combiner for the receiver. That was is my preferred method, more isolation but costs much more. Mike Mullarkey K7PFJ 6886 Sage Ave Firestone, Co 80504 303-736-9693 From:Repeater-Builder@ yahoogroups. com [mailto:Repeater-Builder@ yahoogroups. com] On Behalf Of Merrill Sent: Sunday, February 14, 2010 6:30 PM To: Repeater-Builder@ yahoogroups. com Subject: [Repeater-Builder] Question for the group I have a very broad band uhf antenna on a tower . I would like to run a 440 MHz machine and a 462 MHz machine off of the same antenna . Can I use a notch type mobile duplexer to combine the 2 machines to 1 ant for both TX and RX to notch the respective TX freqs after the duplexers that are on the 2 machines . Merrill KG4IDD
Re: [Repeater-Builder] Just a Crazy Thought
Yes, they existed. We used split sites with a POTS line between them and VOX operation. RX on 23 and TX on 1 for example. We experimented with CTCSS but it wasn't very reliable with out the FM capture effect. This was in the northeast back in the days of 23 channel CB so the statute of limitations has long since expired. From: i recycle computers kc8...@hotmail.com To: Repeater-Builder@yahoogroups.com Sent: Thu, February 11, 2010 8:29:25 PM Subject: [Repeater-Builder] Just a Crazy Thought I have heard numorous urban legends of 27 MHz CB repeaters being built. has anyone ever come across such a thing. if not does anyone think it is even possible from a technical standpoint? the limitations are AM mode, and using any of the 40 CB channels with 4 watts PEP AM or 12 Watts PEP SSB ie: using completely un modified type certified CB gear. Legally a repeater is illegal on CB, but i just want to do an excersize in thought as to what problems someone may run into with such a project, etc. i have seen this questioned asked numorous times through the years and even heard rumors of it actually being done. no one though has actually went deep into the technical aspects of such a project or could point me out to the people who are operating or operated such a setup. Thanks, Rev. Robert P. Chrysafis I Recycle Computers Saving UnWanted PC's From The Landfill One Computer At A Time :) Listen To My Free Live Police Scanner Feed for Tuscaloosa / Northport http://www.radioreference.com/apps/audio/?feedId=3836 Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] dispatch centers run through the internet
VoIP is used daily and has been for over five years for mission-critical applications such major electric and gas utilities and public safety. VoIP isn't the problem, it's the transport medium. Bill --- On Mon, 1/4/10, Don E. Wisdom d...@engineeringinc.com wrote: From: Don E. Wisdom d...@engineeringinc.com Subject: Re: [Repeater-Builder] dispatch centers run through the internet To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com Date: Monday, January 4, 2010, 6:08 PM try again. I am a network engineer and I can tell you all it takes is one mistake or routing loop extended power failure etc and your down for a while. Anyone who would even think about doing this over the internet needs their head checked. Ask yourself this question... If your power goes out at home you have comcast digital voice (that goes over the cable modem) and someone robs your house.. What does your alarm do? Nothing! it cant call out because the power is out. VoIP is not a technology that anyone should be relying on for LIFE SAFETY things. the standard SLA on a T1 connection is 4 hours. (and it should be since it costs $4-500/month) realistically they aren't going to fix it until they're 4 hours are up. Home/business DSL connections typically have no SLA or it isn't worth the toilet paper it is printed upon. Its been proven multiple times in the last year (san francisco fiber cut, deep sea fiber cuts, turkey stealing youtube's ip space etc) that the internet is not 190% reliable. You have to remember that you may have a competent admin but you are just as vulnerable if someone else does not have one. One other thing.. 99.99% of VoIP applications use UDP which is a connectionless protocol. meaning that the side sending it has no clue if it got there. Simply put it either gets there or doesn't and you have no idea which. This is a bad bad bad bad bad bad bad bad bad idea. No insurance company in their right mind will touch this. I'd heard that the NFPA is also looking at banning VoIP's use for fire alarm systems. --Don On Jan 4, 2010, at 4:47 PM, Jed Barton wrote: exactly what i thought. People can say relyability, but your internet connection is probably a hell of a lot more relyable than a typical verizon phone line. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Barry Sent: Monday, January 04, 2010 6:43 PM To: repeater-builder@yahoogroups.com Subject: RE: [Repeater-Builder] dispatch centers run through the internet It's done very day ,a good vpn and intranet and very difficult to interfere, with short of a direct physical connection there is little better so I don't understand all the fuss . Some one posted a good remote radio controller so the rest is down to the skills of the system admin B ( and yes I have had training in the area) To: Repeater-Builder@yahoogroups.com From: rr...@librtynet.com Date: Mon, 4 Jan 2010 16:24:08 -0700 Subject: RE: [Repeater-Builder] dispatch centers run through the internet Given the inherit instability of the internet (it was NEVER designed to do what we are doing with it), I would consider any communications system which is reliant upon the internet to be flawed by design and completely untrustworthy. My two cents worth. From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of WA3GIN Sent: Monday, January 04, 2010 6:23 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] dispatch centers run through the internet Yes, and they are called Intranets. - Original Message - From: Kevin Custer mailto:kug...@kuggie.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Monday, January 04, 2010 5:55 PM Subject: Re: [Repeater-Builder] dispatch centers run through the internet The Internet is a shared medium. A private WAN/LAN commonly utilizes fiber optic cable or licensed wireless networking to accomplish connectivity. While private systems can deliver Internet, it is not (necessarily) THE Internet. Privately owned facilities like what many CATV, Phone, Internet, and combinations of them can have dark fiber or reserved virtual space that cannot get clogged with Internet overhead. The bottlenecking you might experience with facilities you cannot (do not) control can (will) be the downfall of such a system - unless a SLA can be gotten. A SLA is a service level agreement in which a company guarantees connectivity - to some degree. The more reliability the agreement extends - the higher the cost. Kevin Custer Jed Barton wrote: tell me about this system a little bit. You'll note
Re: [Repeater-Builder] Re: 6 Meter RF Amplifier (PA)
How about this PA on ebay? Item # 330387252314 Larcan solid state PA does 600 watts FM and about 1KW on SSB Bill --- On Mon, 12/28/09, skipp025 skipp...@yahoo.com wrote: From: skipp025 skipp...@yahoo.com Subject: [Repeater-Builder] Re: 6 Meter RF Amplifier (PA) To: Repeater-Builder@yahoogroups.com Date: Monday, December 28, 2009, 1:41 PM Hi Paul, We're talking a repeater site type of amplifier... why would I/someone want to heat a Repeater Site? Even with someone working in the building? Those technical guys don't deserve any creature comforts... :-) Besides, the normal building heat is propane. s. Paul Plack pl...@... wrote: Oh, I dunno...if you're also paying the heat bill, running that 4-400 could be a wash! 73, Paul, AE4KR Re: 6 Meter RF Amplifier (PA) I'd love to have this PA just to tinker with... but I'd hate to be the one paying the site power bill. 6 Meter Quintron Transmitter, PA Deck Ebay Item Number: 160389525215 ... and hopefully one would not have to pay for the extra real estate (cabinet space) this baby would fill. cheers, s. Yahoo! Groups Links
Re: [Repeater-Builder] Getting mice out of a repeater sight
Use a bleach/water solution. wear Tyvek coveralls, respirator,face shield and rubber gloves. Look up Hanta virus. Mice carry it and it is bad news. Bring lots of disposable rags or paper towels and double plastic bag the waste. Bleach is far better at killing viruses than alcohol. Bill KB1MGH --- On Tue, 7/28/09, Jed Barton j...@jedbarton.com wrote: From: Jed Barton j...@jedbarton.com Subject: [Repeater-Builder] Getting mice out of a repeater sight To: repeater-builder@yahoogroups.com Date: Tuesday, July 28, 2009, 3:19 PM Hey guys, I am sure many of you have been through this before. The evil mice decided to waunder in to my repeater sight. Up until now they avoided my repeater, but when I went up there, I was less than pleased. They didn't chew any wires thank god, but they walked across the top of the icom rp4020, and left some presents if you know what I mean. I need some input, what's the best way to clean it up, anything in particular? All the covers were on, so I don't think they got inside, but haven't pulled the cover off yet. Any ideas? Thanks, Jed Yahoo! Groups Links
RE: [Repeater-Builder] Notch on duplexers... How low should they go???
The factory preamp was never meant to be used in the repeater configuration. It was primarily for mobiles. I was checking the tuning on my duplexers for the 147.225 repeater after noticing some desense on with the service monitor. I had something like 99 watts going into the duplexers (sinclair Q-202g) and about 85 coming out. I thought, WOW! This cannot be right. Sure enough they were aparently mis-tuned. I switched the service monitor into the tracking gen mode and began. The rx side was pretty close and when I got done I had a -85db or so notch at 147.225mhz. All I had to do was move the ol' notches with the little caps next to the connector. The pass at 147.825 looked good, about -1.5db or so. Moved over to the TX side (low pass) and the notches were off. A good bit off in fact. So I startes tuning them to where they needed to be and all I could get was about -65db or so. What gives?!? Oh no, I thought. I am gonna have to spin the loops! EGAD!!! I hate doing that. Oh well, here goes nothing. I isolated the first jug and began spinning. I ended up getting it (one jug) down to about -31db. The other side were in the -35db or more area. Try as I may the -31db per can was about as good as I could get. Whith both cans together I get a -79db notch on the 147.825 rx frequency with about -1.4 db on the pass. Is this adequate for a MASTR II with the factory preamp? The desense is pretty much gone now. I think if I spent a little more time I could probably get the notch a little closer to the -85db that I got on the other pair on the high pass rx side, but I am not sure it is worth the effort. What do you thing guys??? 73 de N5NPO
RE: [Repeater-Builder] Computer noise in 2M Repeater
If they were only providing the head shield, lots of RF could still have been leaking down the strobe cable. _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of William Becks Sent: Friday, May 01, 2009 3:48 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Computer noise in 2M Repeater Bill, Thanks for responding with the information about the shield kits being supplied by the manufacturer. With this info I will be able to contact them for a price and availability check for our site. I first encountered RFI caused by the early Flashguard units back in the mid 90's. My company had a site with a UHF TDMA rural radio (BETRS) system that suffered high BERT at night. At the time, Flashguard offered a suppression kit to retrofit the strobe housing, but that proved to be virtually ineffective. As a temporary fix, we had gave up channel capacity switching from 16-PSK to 4-PSK modulation. Eventually, we just got rid of the strobe and went with an incandescent beacon lamp system on the tower. Bill - Original Message - From: Bill Smith mailto:brsc...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Friday, May 01, 2009 1:37 PM Subject: RE: [Repeater-Builder] Computer noise in 2M Repeater We contacted Honeywell/Flashguard and they sold us the kits. In our situation, we changed to our backup antenna which is 20 feet below the main which is less than 2 feet from the strobe head until the shield kit was installed. The shield housing mounts to the top plate of the tower with the strobe head placed inside. It's hinged to allow service access. The cable shield is a plastic covered metal liquid tight conduit with a fitting that connects to the shield housing to ground it. Sorry I don't have any cost info. Bill _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of William Becks Sent: Tuesday, April 28, 2009 7:34 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Computer noise in 2M Repeater Bill, Can you please elaborate on the shield housing used? I have similar noise on my VHF ham repeater caused by the same Flashguard 3000 system. I was able to reduce the noise during night operation by reorientation of the antenna at the expense of a less than optimum radiation pattern. The cellular company that owns the tower doesn't seem to have any problems with the RFI from the strobe lamps, but then they are using panel antennas directed away from the tower and strobe lamps. Thank you, Bill, WA8WG - Original Message - From: Bill Smith mailto:brsc...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Tuesday, April 28, 2009 4:33 PM Subject: RE: [Repeater-Builder] Computer noise in 2M Repeater I have experience with several 451 MHz systems getting hammered by noise from the strobe. These were Flashguard 3000 units. During the day when the strobe tubes triggered once it wasn't noticeable. At night when the tubes were retriggered multiple times to lengthen the on time of the flash, it dropped our RX sensitivity by over 30 dB. A spectrum analysis showed noticeable RF from below 50 MHz, peaking around UHF and dropping off around 900 MHz. In this unit, the tubes are about 6 inches long. We installed a shield housing over the entire head and 20 feet down the power cable along with installing toroids on the power feed inside the head. Bill KB1MGH _ Now. the strobe problem you're describing sounds like a potential horrible electrical problem at the site. In my experience an FM rig shouldn't be greatly affected by a strobe. It also shouldn't be causing a problem/reaction with the WISP gear (it may be causing damage to it!) so I'd definitely find out what is going is going on with the strobe. Good luck! Jacob Suter
RE: [Repeater-Builder] Computer noise in 2M Repeater
We contacted Honeywell/Flashguard and they sold us the kits. In our situation, we changed to our backup antenna which is 20 feet below the main which is less than 2 feet from the strobe head until the shield kit was installed. The shield housing mounts to the top plate of the tower with the strobe head placed inside. It's hinged to allow service access. The cable shield is a plastic covered metal liquid tight conduit with a fitting that connects to the shield housing to ground it. Sorry I don't have any cost info. Bill _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of William Becks Sent: Tuesday, April 28, 2009 7:34 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Computer noise in 2M Repeater Bill, Can you please elaborate on the shield housing used? I have similar noise on my VHF ham repeater caused by the same Flashguard 3000 system. I was able to reduce the noise during night operation by reorientation of the antenna at the expense of a less than optimum radiation pattern. The cellular company that owns the tower doesn't seem to have any problems with the RFI from the strobe lamps, but then they are using panel antennas directed away from the tower and strobe lamps. Thank you, Bill, WA8WG - Original Message - From: Bill Smith mailto:brsc...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Tuesday, April 28, 2009 4:33 PM Subject: RE: [Repeater-Builder] Computer noise in 2M Repeater I have experience with several 451 MHz systems getting hammered by noise from the strobe. These were Flashguard 3000 units. During the day when the strobe tubes triggered once it wasn't noticeable. At night when the tubes were retriggered multiple times to lengthen the on time of the flash, it dropped our RX sensitivity by over 30 dB. A spectrum analysis showed noticeable RF from below 50 MHz, peaking around UHF and dropping off around 900 MHz. In this unit, the tubes are about 6 inches long. We installed a shield housing over the entire head and 20 feet down the power cable along with installing toroids on the power feed inside the head. Bill KB1MGH _ Now. the strobe problem you're describing sounds like a potential horrible electrical problem at the site. In my experience an FM rig shouldn't be greatly affected by a strobe. It also shouldn't be causing a problem/reaction with the WISP gear (it may be causing damage to it!) so I'd definitely find out what is going is going on with the strobe. Good luck! Jacob Suter
RE: [Repeater-Builder] Computer noise in 2M Repeater
I have experience with several 451 MHz systems getting hammered by noise from the strobe. These were Flashguard 3000 units. During the day when the strobe tubes triggered once it wasn't noticeable. At night when the tubes were retriggered multiple times to lengthen the on time of the flash, it dropped our RX sensitivity by over 30 dB. A spectrum analysis showed noticeable RF from below 50 MHz, peaking around UHF and dropping off around 900 MHz. In this unit, the tubes are about 6 inches long. We installed a shield housing over the entire head and 20 feet down the power cable along with installing toroids on the power feed inside the head. Bill KB1MGH _ Now. the strobe problem you're describing sounds like a potential horrible electrical problem at the site. In my experience an FM rig shouldn't be greatly affected by a strobe. It also shouldn't be causing a problem/reaction with the WISP gear (it may be causing damage to it!) so I'd definitely find out what is going is going on with the strobe. Good luck! Jacob Suter
Re: [Repeater-Builder] MSR2000
The MSR2000 PA is all UHF. Multiplication is done on the exciter board. RF output of the exciter is around 1/2 watt. Bill KB1MGH --- On Sun, 3/8/09, mike m...@verizon.net wrote: From: mike m...@verizon.net Subject: [Repeater-Builder] MSR2000 To: Repeater-Builder@yahoogroups.com Date: Sunday, March 8, 2009, 6:34 AM I need some info on the UHF MSR2000 PA. Is the tripler section of the UHF MSR2000 located in the PA it self? I have a UHF MSR2000 and was thinking of using it for a link transmitter. I looked on the MSR section here but didn't see anything about the tripler. Thanks for any help in adavance Mike Yahoo! Groups Links
RE: [Repeater-Builder] Iso-coupler
1,000 foot AM tower? --- On Wed, 1/28/09, Jeff DePolo j...@broadsci.com wrote: From: Jeff DePolo j...@broadsci.com Subject: RE: [Repeater-Builder] Iso-coupler To: Repeater-Builder@yahoogroups.com Date: Wednesday, January 28, 2009, 6:11 PM Got and opportunity to locate a repeater on a nice tall 1000 watt broadcast tower.I need an iso-coupler. Where is the best place to order one? Who has the best pricesthese things are not cheap.It will need to be cut to freq of course ron Call Sinan at Armstrong Transmitter (www.armstrongtx.com). His are decent, and affordable, for the low-power version. Kintronic Labs (www.kintronic.com) and Audiolab (www.audiolabelectronics.com) are two others. I've used the former but not the latter - they're nice but expensive. I won't get into it, but I guess you know there are FCC regs (and some new rulemaking propsed) that deal with installing antennas (as well as erecting towers) on and near AM broadcast stations. Just want to make sure you don't get yourself into something you weren't expecting... --- Jeff WN3A Yahoo! Groups Links
