[Repeater-Builder] Re: Ge mastr 2 link question
Mike, Did you just build up these repeaters? If so, you need to remember to install a load on the audio output of the receiver audio amplifier. This can be placed at the speaker connections. If there is not an 8 Ohm load on the audio output, it will produce a low level oscillation in the audio circuits around 500 hz which some people call Hum. I modify my GE Mstr II mobile receivers by adding a switch in series with R616 on the Audio Squelch board which is a 30 ohm resistor feeding regulated 10 volts to the Audio IC U604. Opening this switch turns off the audio amplifier when no speaker audio is desired. This also helps reduce current draw from the receiver. Just a suggestion, John, K7JL Intermountain Intertie 3d. Re: Ge mastr 2 link question Posted by: Mike DeWaele [EMAIL PROTECTED] firechief762 Date: Sun Oct 19, 2008 5:28 pm ((PDT)) Paul, Eric Thanks for the response. I did some more testing with your suggestions. I tried hooking both radios up to a deep cycle battery. The hum is still there so I think that rules out the astrons! The audio from the main repeater to the link isn't as bad as from the link back to the main repeater. Both have a hum to them however the 2 meter to the 440 you can hear the voice. the other way all you get is the hum. For testing I have it on the bench in the basement. the only common connection is only the audio and tx lines between the two radios. I have also tried it with a common ground as suggested by NHRC in the controller directions. Both have the same results. I want to make sure it works here before it goes back to the hill. At the site it's just my radio equipment and Wifi internet which has not given me any problems with both machines working there prior to bringing them to my house to work on this linking project. Maybe tomorrow I will give NHRC a call and see if they have run into this problem before. Thanks, Mike KA2NDW -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Paul Plack Sent: Sunday, October 19, 2008 4:59 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Ge mastr 2 link question
[Repeater-Builder] Motorola R100 repeater
I have acquired a Motorola R100 repeater and I am trying to find out its capabilities. Do anyone know if the Motorola R100 repeater will tune down to the 434 MHz part of the amateur band? Will it program to an offset other than 5 Mhz? Is programming software available for this? Where can it be found? Is the programming software and cables only available from Motorola? I can tune the RF stages of the repeater and I have all the necessary RF test gear to do this. I need to find out how to program the amateur frequencies, get the software or find out where to get this done. Thank You, John Lloyd, K7JL __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
[Repeater-Builder] Coax for cabinet and for feedline - other than hardline
Joe, You will be better off if you stay away from the LMR400 type of coax due to the braid can rub against the shield (dissimilar metals) and create noise in your repeater system. Yes, I would replace your coax run with Heliax cable which is sometimes called hard line. I use Andrew LDF4-50A 1/2 Heliax on VHF runs up to 150 Ft and I use LDF5-50A 7/8 Heliax on UHF runs over 75 Ft. Make sure you install grounding kits on each Heliax cable before entering your home for lightning protection. Connect this to a good copper lightning rod earth ground. I use RG-142B/U for most of my in cabinet connections and more recently have switched to installing Andrew FSJ1-50 1/4 heliax inside in the cabinet on UHF because of its lower loss. I would not use the Diawa wattmeter permanently on the output of the duplexer. Use a Bird 43 with N connectors and the proper slug. When not using the meter, turn the slug 90 degrees so that the meter is grounded and protected from lightning strikes. I use high quality commercial antennas because most of my repeaters are located at high elevation sites that demand the best antennas due to the extremes of weather conditions. I would recommend the DB408 antenna for UHF. I have several of them in Amateur service. I would recommend the Sinclair or DB antennas. The Diamond antenna would be ok for your home location. I have a UHF repeater at my home and I use the Diamond X50 antenna on my tower at 60 Ft and it works well. I feed it with 75 Ft of 1/2 Heliax cable. That is the only place I use a Diamond antenna. For all outside coax connections, make sure you use butyl rubber and good 3M type 88 tape to seal them up to keep moisture out. I also use Micor stations at my repeater sites. I have one on 2Mtrs at an 11,000 Ft site near Salt Lake. It has been in operation there since it was installed back in 1973. Yes, I have had to maintain it over the years and rebuilt the PA a few times but it has provided many years of trouble free operation! I am curious what problems you have had with yours? I also use the Kenwood TKR-750 and TKR-850 repeaters at some sites and they both work fine too. I have had years of trouble free service with them. I mainly use the GE Mastr II stations at all my sites. I have had very good results with these radios. Most of my repeaters are linked together so when you key one up, they all key up together. Thanks, John Lloyd, K7JL Intermountain Intertie http://utahvhfs.org/snowlink.html From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of kc7ght Sent: Friday, March 16, 2007 1:13 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Coax for cabinet and for feedline - other than hardline Gentlemen, Is LMR-400 a good coax to use for my 70cm repeater feedline. My feedline is 130 feet long and located at my house. Should I really go to hardline and replace my LMR-400 feedline? If so what diameter? Will it really be worth the cost and trouble to run it through my attic and into my house? Your article indicates that some LMR-nnn coax are OK for cabinet connections. Is LMR-400 Ultraflex a good choice for cabinet connections? I am using RG-142B/U now for my duplexer connections (an Angle Linear custom made duplexer, bandpass cavities, and preamp). Should I use RG-142/B/U for my (30 inch long) Tx to duplexer run also? I would like to keep my new Daiwa CN-801 (UHF connectors) SWR Power meter in the Tx line permanently. Is this a good idea? It is comforting to see the power and SWR at a glance. I am using a Diamond X510MA (17 feet long with a UHF connector) dual band antenna at 65 feet high. Should I be using a different antenna for my repeat operation? If so, what antenna? Is the Kenwood TKR-850 repeater a good unit. I just ordered one to replace my Micors. I have nursed my two Micors for the last year, and just gave up on them. One problem after another on both units. Please let me know your thoughts and suggestions Thank you. Joe KC7GHT The fish are biting. Get more visitors on your site using Yahoo! Search Marketing. http://searchmarketing.yahoo.com/arp/sponsoredsearch_v2.php
[Repeater-Builder] 440-450 Utah Band Plan
Here in Utah, our amateur repeaters share sites with commercial and the broadcasters repeaters. We chose the Low in/Hi out plan on UHF so that our amateur repeaters could co-exist with them at our mountain top sites and not get de-sensed with the numerous 450.xxx broadcasters and 451.xxx commercial repeaters. We could not see having our amateur repeater receivers at 449.xxx being so close to the 100 watt 450.xxx and 451.xxx repeater transmitters. To avoid intermod that can be generated at the site, we install dual isolators to get around 70 db of isolation on our transmitters and we use band pass type cavities and or BpBr duplexers on every repeater. Some locations have transmitter combiners that use dual isolators on each port. Everyone cooperates and keeps their sites clean and removes unused antennas and hardware from their towers. This has proven to be sound engineering practice for our repeaters. These repeaters are located at Farnsworth Peak which is 18 miles west of Salt Lake City where it is classified as the 3rd most RF populated site in the USA! All of the local NTSC, DTV, FM Broadcast and most all Two Way repeater systems are located here. I also own and operate several VHF and UHF repeaters. John Lloyd, K7JL Utah VHF Society Frequency Coordinator Posted by: k7pfj [EMAIL PROTECTED] k7pfj Date: Sun Feb 25, 2007 7:52 am ((PST)) Being the chairman on a repeater cordination councel and having many operational UHF repeaters. One could only wish that the band plans were the same as in the country but everyone has to be a little bit differant. We the hams dictate what we want to do and if we all in the country could decide on a band plan that is standard it would make cordination a little more pleasant to deal with. Cal guys on the middle sound like they are getting screwed. Here in Oregon we are Low out and high in. Well thats nice but when you are offered to combine into a site combining system things have to be done to accomidate the low freqs. It we were all low in and high out it would, one help all of us in the since you would get your recievers away from the 450 stuff and keep the trasmitters all together. You would most likley notice that your repeaters would recieve better. More than half of my repeaters run through combining and when were building the combining we make provisions for hams to have some slots so we can have everthing on the site run through the site antennas. How about a 5 channel ham VHF combiner with all repeaters operational and work great. 73 K7PFJ Want to start your own business? Learn how on Yahoo! Small Business. http://smallbusiness.yahoo.com/r-index
[Repeater-Builder] Service speaker not workinng
Daniel, You need to start way before the speaker to make sure that the receiver and the audio amplifiers are working at all. I always look at the volume squelch HI pin coming from the receiver. This is audio from the discriminator that is amplified. This is found on the systems board P104 on pin 11. It is marked volume squelch hi. It is very near the audio output transformer. I use a scope at this point and if your receiver is working then you will see random noise like what you would hear with an open squelch. If you have an audio amplifier then you could hook up the input to this point and you would hear an open squelch. The audio level is about 1 volt at this point. Try this and see if your receiver is working. If you have audio at this point the you need to check to see if it is getting to Pin 13 which is the audio input to the amplifier. It comes from the wiper of pot R3 on the systems board. This pot sets the audio level into the audio amplifier. This pot is near the large 400 uf filter capacitor and near the metering socket. You also want to make sure that power is getting to the audio output transistors. Pin 20 is A- or ground in a base station and pin 15 is A+ or 13.8 volts. Let me know what you found out. John Lloyd, K7JL Intermountain Intertie http://utahvhfs.org/snowlink.html 3. Service speaker not workinng Posted by: Daniel M LePage [EMAIL PROTECTED] dmlgnnv Date: Sun Dec 10, 2006 2:12 pm ((PST)) When I changed the shelf this reciever did have service speaker operated. The number stamped on the drawer is PL 19D4172G2G1 REV Blank. I have been trying to find the right print on the web site but I can not find it. I have tested the speaker with an audio tone and it does work from pins 11 12 of J932 but I get no audio there. The audio from the system board on pins 952 16 and 17 look like large orange and red wires going to J 931. If any one can guide me to get this to work please do so. I am still trying to get the receiver sens problem resolved but need to be able to hear the repeater locally when I am working on the receiver. 73's Dan WA1OOH Any questions? Get answers on any topic at www.Answers.yahoo.com. Try it now.
[Repeater-Builder] 6M duplexer wanted in UK
Dave, You can build your own 6 Mtr duplexer. Find some 1-5/8 heliax and put one together. Look at http://www.wa7x.com/ki7dx_rpt.html Thanks, John, K7JL Utah VHF Society http://utahvhfs.org/snowlink.html 1a. 6M duplexer wanted in UK Posted by: dave_g7uzn [EMAIL PROTECTED] dave_g7uzn Date: Tue Dec 5, 2006 3:20 am ((PST)) Hi All, Is anyone with a set of cavity filters suitable for 50/51MHz brave enough to sell them to me and get them shipped to the UK for a 6M repeater project? ALL expences will of course be covered. If you can help please email me direct at [EMAIL PROTECTED] Need a quick answer? Get one in minutes from people who know. Ask your question on www.Answers.yahoo.com
[Repeater-Builder] Mastr II question
Kevin, This sounds like a classic intermod problem. Does your repeater and the new one each have a dual isolator on its transmitter? Yes, you will need a dual isolator on your repeater transmitter as well as the new one 30 khz away. John Lloyd, K7JL Intermountain Intertie http://www.ussc.com/%7Euvhfs/snowlink.html Message: 17 Date: Mon, 14 Nov 2005 18:54:42 -0500 From: Kevin Berlen, K9HX [EMAIL PROTECTED] Subject: Mastr II question One of the systems I take care of uses a Mastr II in station configruation as it's transmitter. Recently, a repeater went on the air that is 30 KHz above our operating frequency. If you are within about five miles of our site and are monitoring on the new machines frequency, you can hear our repeater. It is not distorted, and it does not have any other modulation on it. I have heard this signal on a number of differnet rigs, and so have several other users, so I don't think it is a problem with overload of my receiver or other problems in my equipment. I am not using the station receiver in the repeater, but have an ICOM in it, as the only TX ICOM I had was an EC version. I am using the RX ICOM just to provide the conpensation signal to the TX element. I had a similar problem about a year ago with a spur 60 KHz above our carrier, but it cleared up after I swapped the exciter and PA boards out. I have not yet been to the site to check out anything yet, but just wondered if this is a problem anyone else has seen. Thanks, and 73, Kevin, K9HX __ Yahoo! FareChase: Search multiple travel sites in one click. http://farechase.yahoo.com 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] Fwd: Where can I find cables
Note: forwarded message attached. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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/ ---BeginMessage--- Ed, Have you tried Pasternack? 949-261-1920 Every cable that I have ordered from them they had in stock and they delivered them fast. John, K7JL Date: Fri, 29 Apr 2005 21:49:51 -0500 From: Ed Folta [EMAIL PROTECTED] Subject: Re: Where can I find cables Hello Group Anyone have a good source for fast delivery and good prices on fabricated coaxial cable jumpers I need about 100, 2 foot long RG214 or equiv cables with male N on each end. Need new merchandise, or at least very clean, Price and delivery time Ed Com/Rad Inc __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ---End Message---
[Repeater-Builder] LBI30200 UHF Exciter manual wanted
I am looking for a GE manual for the UHF exciter 19D423865G4. It is GE manual LBI30200. I searched for it on the GE manual listings at Repeater Builders but it is not there. Does someone have a .pdf copy of this manual that they send to me via email? Thank You, John Lloyd K7JL 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] Antenna mounting brackets
Have you tried Tessco? www.tessco.com John, K7JL From: Al Wolfe To: Repeater-Builder@yahoogroups.com Sent: Wednesday, March 09, 2005 8:12 PM Subject: [Repeater-Builder] Antenna mounting brackets Anyone got any ideas on where to find standoff mounting brackets for a DB224? Also interested in where to find stiff-arm hardware, etc. I have just welded up something in the past but this will be at 400 feet, side mounted. Needs to be commercial quality. 73, Al, K9SI __ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/ 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] Colocating second UHF rptr
John, The 10 Feet between antennas will work fine but you WILL NEED to install Dual Isolators, that have 70 db of isolation, on each transmitter before going to the cavity or duplexer. If you don't you will be generating Intermod from your transmitters that will be heard for several miles. The use of an Isolator will reduce the amount of Intermod or IM that will be generated by your repeater transmitters because of close proximity of your antennas. The output of 442.150 will be radiated by its antenna and picked up in the nearby antenna and sent down the coax into the PA of the 442.175 transmitter and mixed. This generates a new frequency of 442.125 which then can go out the coax and into the antenna to be radiated out to be heard. You will also generate 442.200 going the other direction. This is the 2A-B or 2B-A intermod mix. It gets more complex with each new transmitter. Telewave had a good article about the use of Isolators at multiple transmitter locations on their web page at one time but it is not there now. Here is where you can find spec sheets on the Telewave brand of Isolators: http://www.telewave.com/pricelist/isolatordat.html There are a number of Isolators manufactures on the market. Thanks, John Lloyd, K7JL Intermountain Intertie www.ussc.com/~uvhfs/snowlink.html *** Message: 3 Date: Mon, 28 Feb 2005 14:22:15 - From: johnmichaelwelton [EMAIL PROTECTED] Subject: Colocating second UHF rptr I have a site on top of the local hospital with 3 2in galvanized mounts attached to the roof separated by ~5ft each. On the first two I have a DB404 on 442.150/R [abt 50 watts out of the duplexer] and the middle mount is a DB224 on 147.390/R [also abt 50 watts out of the duplexer]. I'd like to put a second UHF rptr at the site on the open third mount and dedicate to VOIP application [I have a dedicated LAN on emergency power and T3 lines to campus]. I'm considering putting up a DB411 and using either 442.125 or 442.175 as potential freqs (both are available here) thinking that the respective duplexers will help notch out the adjacent tx signal some and will still have ~5Mhz split between TX and RX. The only other options I have is a roof vent that could support maybe an X50 or something equivalent that is very small and this is on the main roof one floor below and abt 100 ft away from the main 442.150 antenna (I have 1/2 in LDF4 to run there). Any comments if the 10ft or so between the two UHF antennas will work? John/N4SJW Charleston, SC __ Do you Yahoo!? Yahoo! Mail - 250MB free storage. Do more. Manage less. http://info.mail.yahoo.com/mail_250 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] Technical article about Isolators by EMR Corp.
The Care and feeding of RF Isolators by EMR corp is found by going to: http://www.emrcorp.com/technical_cover.htm and then clicking on The Care and feeding of RF Isolators John Lloyd, K7JL __ Do you Yahoo!? Yahoo! Sports - Sign up for Fantasy Baseball. http://baseball.fantasysports.yahoo.com/ 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] Sinclair SRL229 Antenna recommended for Repeaters
Kevin, I also recommend the Sinclair SRL229 having used them at my 147.180 repeater site at 11,000 Ft for over 30 years now! I have had one apart and the radiating elements are made of solid brass rod with phasing coils between elements. The ends of the rods are drilled out for the phasing coils to be soldered in place. There is a combination of shorted stubs in the mounting base with one made out of RG142 coax and tucked up inside. The top element is attached to the lightning spike that is pushed through the top of the Radome and tightened with a nut and lockwasher. Three screws are removed at the bottom mounting pipe to remove the inside antenna elements. John Lloyd, K7JL Intermountain Intertie http://www.ussc.com/~uvhfs/snowpix1.shtml Date: Sun, 09 Jan 2005 10:49:09 -0500 From: Kevin Custer [EMAIL PROTECTED] Subject: Re: Re: Decibel Products DB-224 Antenna Noise Doug Zastrow wrote: Russ brought up the point that some techs really shy away from the DB-224 because of the potential noise problem. I've been scared of the fiberglass collinears because of the element solder joint crack issue and it's resultant noise problems. What's the commercial 'antenna of choice' for two-meter repeater operation here at Repeater-Builder? I have had excellent long-term luck with the Sinclair SRL-229. It's a large aperture (23+ foot) fiberglass radomed stick, but is not built like the stationmaster with opposing sections of large (copper water pipe) coax. I have had experience with several that have been up for 20+ years without failure in the duplex mode. I don't know how they are made internally because I have never had to take one apart. A Sinclair Engineer told me they were not made like their competition, and might possibly be solid rod with phasing coils between them. Any fiberglass radomed antenna will suffer greatly from Corona and Precipitation Static, especially when top mounted. This was a big deal until the Static Buster was developed, tested, and proven to nearly eliminate the problem. http://www.repeater-builder.com/antenna/static.html Kevin Custer __ Do you Yahoo!? Yahoo! Mail - Find what you need with new enhanced search. http://info.mail.yahoo.com/mail_250 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] Re: question on repeater set up...
Message: 12 Ed, You need to contact APCO to get the coordinator for Fire Frequencies. http://www.apcointl.org/frequency/ Thanks, John Lloyd, K7JL Utah VHF Society Frequency Coordinator Date: Thu, 6 Jan 2005 04:15:40 -0800 (PST) From: Ed Lemley [EMAIL PROTECTED] Subject: Re: question on repeater set up... Thanks for the responses. I am a ham, but this repeater will be for the fire dept. We are needing a repeater because a simlex channel just doesn't work that well anymore. And I don't know who the local coordinator is, how could I find out who it is? And I have looked for possible frequencies, but the FCC site has been down for the last few days now. Thanks Ed __ Do you Yahoo!? Yahoo! Mail - Find what you need with new enhanced search. http://info.mail.yahoo.com/mail_250 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] LBI30002 for GE Voting Selector
I am looking for the service manual for the older Grey Voting Selector. It is LBI 30002. I am looking for the schematic for the voter module, 19D413994G1, that uses discreet components. Does someone have this in a PDF format that they could emain to me? Thank You, John Lloyd, K7JL 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] intermittent 'noise' problems
Rick, Make sure you check other nearby towers for loose or rusty hardware. I had a similiar problem with a nearby tower, 100 Ft away from our 146.940 repeater antenna and the owner used a non galvanized anchor plate for his guy wires. Well it rusted over time and became the intermod generator for the site. I installed copper wire jumpers from each guy wire to the guy rod to bypass the IM generator guy anchor plate. This solved the problem and the noise is gone. John, K7JL --- Rick Stoneking [EMAIL PROTECTED] wrote: All, I am trying to resolve a problem on a local repeater where they are having intermittent 'noise' problems. Background: This a commercial GE repeater that has been modified for 2m use. When the noise is not present the repeater performance is outstanding with a wide coverage area. The following have been replaced with new and had no effect: - tranmitter/receiver - antenna (super station master) - hardline from duplexer to antenna - repeater controller The noise may be related to weather (wet or cold causing an increase in the problem) though it is not a everytime event. It was originaly believed that it was a grounding problem but grounding improvements have had no lasting effect. At one point it was said that the guy wires were causing the problem so the club recently put insulators in all 9 guy wires about 6 to 8 feet from the anchor point - no help. The problem, which sounds like static or popping, occurs only during transmitting incoming audio. In other words, all controller generated audio is fine, no noise what so ever. Go to the repeater site and use a signal generator or some other means to creat a weak signal and key the transmitter. Then start shaking everything on the tower. Something ls loose and rubbing on something else.. I ahd a guy wire problem when the wind would blow. The repeater was in a 6x6 foot building at the bottom of a 100 foot tower. The antenna was a station master at the top. The guy wires at the ground had about 2 or 3 feet extra that were hanging loose after the clamps. Some of them were rubbing the guy wires going to the tower. Clamped them down and that solved the problem. __ Do you Yahoo!? Yahoo! Mail - Helps protect you from nasty viruses. http://promotions.yahoo.com/new_mail 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] Intermod problem?
Q, I had a IM problem several years ago with our 146.940 repeater. The repeater was a GE MastrII station with a dual isolator on the transmitter and a bandpass bandreject duplexer. The antenna was a Sinclair SRL229 mounted to a 40 Ft wood pole. The other transmitters found in the IM mix were AM broadcast transmitters nearby. One was on 910 khz and the other on 1510 khz. Thats right, they were 600 khz apart. When the 146.94 transmitter came on the mix was present and heard in the 146.34 receiver until the repeater timed out. One clue was that the IM would go away at sundown and return at sunrise. We found that the station on 1510 went to very low power at night. Both AM transmitters were within 5 miles of this repeater and were very strong. It turned out that the mix was coming from a nearby tower that had 3 rusty guy anchors. This was a 120 Ft tower that was 200 Ft away. I solved the problem by putting in jumper wires attached with cable clamps from each of the guy wire to ground which bypassed the rusty guy wire combing plate. Look for any rusty guy wires, rusty joints between guy wires, rusty tower joints, loose metal rubbing up against a tower leg or section, loose hardware on a tower,antenna elements that have come loose from their mount. This should get you started. The site that has the strongest interferrence is most likely to have the problem nearby. This sounds like the 146.70 location from your description. I would make sure that both repeaters have dual isolators on their transmitters. A dual isolator keeps the transmitter PA from creating the 2A-B and 2B-A mix from happening and being radiated back out through your antenna. I recently found and purchased a tuneable Sinclair Dual Isolator and I tuned it down to 145.270 just fine. Insertion loss was under 1 db and the isolation was 75 DB on frequency. I got mine from Bill Hance, KD7CWA. Bill knows his stuff and is good to work with. John Lloyd, K7JL Date: Sun, 3 Oct 2004 01:18:22 -0400 From: Q [EMAIL PROTECTED] Subject: Intermod problem? Trying to troubleshoot an intermod??? problem between two repeaters. The 146.10/.70 repeater's receiver gets blasted by the 147.90/.30 transmitter but only when they are both transmitting. Yes,the transit freqs are 600khz apart and they are only 5 miles apart. Would a circulator help this problem? Also have similar problem between the 146.07/.67 and the 147.87/.27 repeaters when they are both keyed up. Ideas? ___ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com 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] Highest repeater
I have had my 2 mtr, 147.180 repeater at the same site location here in Utah at 11,000 Ft since 1974. Does this longitivity and elevation qualify? John, K7JL Is there a repeater on the space station? That's gotta about as high as you can get I would think.. I wonder if it is a Mastr-Pro ___ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com 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] New Sinclair 2M Antenna Question
It sounds like you have a SRL229 antenna. That extra cable in the mounting tube is part of the matching network. Just push it back up inside the mounting tube. Only the VHF model uses this RG142 matching cable. I have used these antennas for over 20 years now and have had excellent results. You can see some pictures of them on our web page. John Lloyd, K7JL http://www.ussc.com/~uvhfs/snowlink.html Date: Mon, 20 Sep 2004 12:27:13 -0400 From: [EMAIL PROTECTED] [EMAIL PROTECTED] Subject: New Sinclair 2M Antenna Question We just purchased a new Sinclair 2-Meter Collinear antenna for our 2-Meter Repeater to replace a similar Celwave Stationmaster antenna that was about 14 years old (turns out we probably really didn't need to, it still looks almost brand new). The new Sinclair 2-Meter antenna arrived (ordered for our 2-Meter channel) and we found a second cable going into the base of the antenna. There's the main antenna connector, and there's also a short length of what appears to be RG-142 cable, hanging out and going nowhere. We've worked with many of these Stationmaster type collinear antennas for many years, but have never seen anything like this. The instruction sheet and frequency sweep don't mention anything about this loose cable going into the antenna. Has anyone else seen this and know what it's for? Our dealer that we ordered it through hasn't seen anything like this, either, and was at a loss to explain what it might be. We also ordered a brand new 10dB Sinclair collinear for 440 MHz, and it doesn't have this extra cable. LJ ___ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com 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] low band Amateur repeater
Our group here in Utah has a low band 6 Mtr Amateur repeater on top of a 9,000 Ft mountain. It uses a 1 Mhz split on 53.15 output and 52.15 input. The Radio is a GE MastrII and we built a band pass band reject Duplexer out of 4 DB products cavities. The antenna is a modified Celwave omni. You can see it on our web page by going to: http://www.wa7x.com/ki7dx_rpt.html Thanks, John, K7JL Message: 7 Date: Sat, 18 Sep 2004 17:16:59 -0400 From: Maire Company [EMAIL PROTECTED] Subject: low band repeater does any one know of any low band repeaters on the air? (30 to 40 mhz) if so how good do they work? any ham repeaters? if so how far does the tx and rx freg need to be? looking to built one and any help would help thanks John __ Do you Yahoo!? Y! Messenger - Communicate in real time. Download now. http://messenger.yahoo.com 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] Recording repeater audio computer program
Some time ago I remember seeing a discussion about a recording program that runs on a personal computer to record the audio from a repeater. Can some one direct me to where I can find this information? I have searched the messages and have not found it. Thanks, John, K7JL __ Do you Yahoo!? Yahoo! Mail - 50x more storage than other providers! http://promotions.yahoo.com/new_mail 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] KENWOOD TKR-850 UHF REPEATER YES, it can be tuned in the Ham Band
To answer your question and speculation about whether or not the Kenwood TKR-850 will tune and operate in the amateur band, well the answer is YES. I have just finished tuning and installing my Kenwood TKR850 repeater two weeks ago at one of our repeater sites in south eastern Idaho. My frequencies were on 441 Mhz Receive and 446 Mhz Transmit. I had to tune the Receiver Helical front end and set the VCO's. It made factory spec's after tuning. Mine was a 450-470 mhz version. The programming and tuning took less than one hour. I know of another local ham who tuned his TKR-850 in the Amateur bands. His receives at 443 and transmits at 448 Mhz. That's two TKR-850 repeaters that I know of that have been tuned successfully to the 440-450 band from the 450-470 band. I received my manuals in PDF format. I will check to see if I can send you a copy. Thanks, John Lloyd, K7JL Intermountain Intertie http://www.ussc.com/~uvhfs/snowlink.html Date: Sat, 04 Sep 2004 09:45:34 -0700 From: Eric Lemmon [EMAIL PROTECTED] Subject: Re: KENWOOD TKR-850 UHF REPEATER Can it be tuned and Programed in the Ham Band The answer is probably. The fact that others have tuned a TKR-850 to the 70cm band is not an absolute guarantee that your unit will do the same. It may work fine, or it may barely make it. The TKR-750 and -850 repeaters have manually-tuned bandpass filters in the front end that must be optimized for the Ham bands. As delivered, the filters in the TKR-850 are optimized for 450-470 MHz, but still need to be tweaked for maximum receive sensitivity. Also, the RX and TX VCOs need to be adjusted slightly to ensure that they operate over the optimum locking range. Like most RF equipment, operating a TKR repeater outside of its specified band carries some risk; it's best to minimize the risk with careful tuning. Before you attempt to tune this repeater, get a Service Manual from Pacific Coast Parts, about $23. Leave the repeater power on while you're waiting for the manual, so that the reference crystal oscillator can settle in to a stable frequency. Every TKR repeater I have set up needed to have the reference oscillator tweaked slightly to bring it exactly on frequency. 73, Eric Lemmon WB6FLY aj4ef wrote: KENWOOD TKR-850 UHF REPEATER Can it be tuned and Programed in the Ham Band? The 450-470 Mhz Model. I need it to TX 442.100 RX 447.100 Thanks for the help. ___ Do you Yahoo!? Win 1 of 4,000 free domain names from Yahoo! Enter now. http://promotions.yahoo.com/goldrush 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] Fwd: Re: Motorola Nucleus II 900 mhz
Note: forwarded message attached. __ Do you Yahoo!? New and Improved Yahoo! Mail - Send 10MB messages! http://promotions.yahoo.com/new_mail 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/ ---BeginMessage--- Coy, I have 2 each 929 and 940 Mhz paging transmitters at my site. The 940 mhz transmitter is the Motorola. The 929 mhz transmitter is a Quintron. My co-located 145.410, 2 mtr repeater works fine. I use a TXRX duplexer. I use 40 ft of vertical separation between the 900 mhz transmitter antennas and the 2 mtr antenna. I understand what you are talking about. My repeater was there before the 900 mhz transmitters. Yes, the noise floor came up when the 900 mhz transmitters were added. You state in your reply that you have a Wacom WP641 BpBr duplexer with an Additional Band Pass cavity tuned to your receive frequency, a Notch filter, a 5 pole Helical front end feeding a MASTRII receiver with additional 5 poles Helical filtration. Can you tell us what frequency the notch filter is tuned to? Tell us about your band pass cavity. Is it a large type like the DB4002 or is it a much smaller type. Did you put the 5 pole helical front end filter in front of your receiver to try to eliminate the 900 mhz transmitter interferrence? If you do have on frequency interferrence on 144.510, then this will not help. If I read your response correctly, your antenna coax connects to your Wacom WP641 Duplexer, then through a band pass cavity, then you have a notch cavity in line, then the signal goes through a 5 pole helical filter, and then possibly through another 5 pole helical filter and then to your receiver. You say that you are feeding a MastrII receiver with additional 5 poles Helical filtration. Are you just commenting on the Mastr II front end casting filter or do you actually have another 5 poles of Helical filtering before the receiver? Were all these filters installed to try to reduce the interferrence from the 900 mhz transmitter? Can you tell us your thought process why they were installed? You also say that It's difficult to get 40 feet vertical seperation on top of a building. I do not know your situation, but over the years, I have installed numerous 40 and 50 Ft Rohn 25G and Rohn 45G type towers on the top of buildings. I agree it can be difficult but it can also be possible. Have you asked if you can put up a few tower sections on the roof of this building? You may first want to try a push up mast with you antenna on it to see if the interferrence goes away with some vertical separation. These masts can be found at any Radio Shack or TV stores. Also, Spectrum Analyzers can be overloaded very easily from nearby transmitters. You will need to use a bandpass cavity in front of the Spectrum Analyzer tuned to your receiver frequency to verify on frequency interferrence. John Lloyd, K7JL Intermountain Intertie http://www.ussc.com/~uvhfs/snowlink.html Message: 10 Date: Tue, 10 Aug 2004 23:51:05 - From: Coy Hilton [EMAIL PROTECTED] Subject: Re: Motorola Nucleus II 900 mhz AS stated in one of my posts, it's 144.510 MHZ. the remainder of the equipment used to assist with eliminating this problem is as follows. a Wacom WP641 duplexer, BpBr With an Additional BAnd Pass cavity tuned to my receive frequency, also a Notch filter, a 5 pole Helical front end feeding a MASTRII receiver with additional 5 poles Helical filtration. Please read the following carefully and slowly. THE INTERFERANCE IS ON THE RECEIVER FREQUENCY...I CAN SEE IT ON THE SPECTRUM ANALYZER and AT LEAST ONE OTHER PLACE ON THE BAND AT 154.490, BROAD BAND, AND 20 KHZ WIDE. This problem has to be solved at the source not band aided by me trying to put every kind of filter known to man on my receiver. The only way that I can solve it, is to move to another site or turn my receiver off. What I need to know is has anyone had this problem with this Transmitter and a little about the transmitter like normal configuration. Oh, Motorola told me that They didn't build this model transmitter. It was built by Nucleus Inc a third party company in Texas It's difficult to get 40 feet vertical seperation on top of a building. 73 AC0Y --- In Repeater-Builder@yahoogroups.com, Mr John Lloyd [EMAIL PROTECTED] wrote: Coy, You did not say anything about what receiver frequency you are using that is getting hit by the 900 mhz transmitter. Do you have a bandpass cavity on your receiver? If you are using a BpBr type of duplexer, then it has almost no rejection to the 900 Mhz signal. You will need a bandpass cavity on your receiver. Most 900 Mhz paging transmitters have an output power of 300-500 watts. You will need
[Repeater-Builder] Motorola Nucleus II 900 mhz
Coy, You did not say anything about what receiver frequency you are using that is getting hit by the 900 mhz transmitter. Do you have a bandpass cavity on your receiver? If you are using a BpBr type of duplexer, then it has almost no rejection to the 900 Mhz signal. You will need a bandpass cavity on your receiver. Most 900 Mhz paging transmitters have an output power of 300-500 watts. You will need vertical separation between your antennas and bandpass cavities to solve this. The 25 Ft separation is next to nothing if it is horizontal. You will need at least 40 Ft of vertical separation between your antennas. John, K7JL Message: 9 Date: Mon, 09 Aug 2004 22:15:52 - From: Coy Hilton [EMAIL PROTECTED] Subject: Motorola Nucleus II 900 mhz Does any one have any info on the possible problems with noisy Motorola Nucleus II 900 mhz transmitters? A paging company coo- locatde at the site with my repeater has one that's driving me up the wall. I have been working with them for 3 months now, to get it fixed. They recently changed antennas to one located about 25 feet away but there are spurs on my input frequency but, that did a lot of good. NOT. I'm about ready to fax Riley H. at the FCC. I'm trying to be a good neighbor but I've about had it 73 AC0Y __ Do you Yahoo!? Yahoo! Mail Address AutoComplete - You start. We finish. http://promotions.yahoo.com/new_mail 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] 2m repeater IMD issue
Several years ago, I had a similar problem with AM stations 1510 and 910 that were 600 khz apart. They were both about 5 miles away from our repeater. Our 146.94 repeater when it keyed up was hearing the audio combination of both AM transmitters that were on during the day. The problem went away at sundown when the one AM station went off the air and returned the next morning at sunrise when it came back on. We traced the IMD mix point to a guy wire anchor plate on a nearby 120 ft tower that was rusty and it wasn't even galvanized! We solved the problem by adding wire jumpers with cable clamps from each guy wire to the anchor rod which shorted out the diode action of the rusty anchor plate. John, K7JL * Message: 21 Date: Thu, 06 May 2004 04:52:01 - From: Laryn Lohman [EMAIL PROTECTED] Subject: Re: 2m repeater IMD issue This is something fairly easy to check, and is my experience with structure generated IMD. Two FM broadcast stations, one is 1 mile away from our repeater, the other is much higher power and about 8 miles away. Their frequencies are 89.3 and 89.9---600kc apart. The intermod generated was very broadband because of the FM station deviation at 75kc. It caused no problems until BOTH stations were transmitting little or no audio, then it would show up. Anyway, the intermod was generated at the guy anchor points. Tower riggers often lace a piece of cable through the turnbuckle centers to keep them from rotating. Where this cable touches/barely touches the turnbuckle is where the problem was. Simply isolating these elements from each other with pieces of cable insulation cured the problem. Ya never know. All the best finding your problem. Laryn K8TVZ 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] 2m repeater IMD issue
Richard, Have you tried installing a low pass filter between your 2 Mtr duplexer and the antenna feed line? I am talking about the large low pass filters that were found in the old VHF Motorola base stations that were about 1 inch in diameter and about 14 inches long. I have a similar situation where my 2 mtr antenna is also at the same elevation as numerous other 800 Mhz repeater antennas and the addition of a low pass filter in my 2 mtr repeater feed line cured the problem like you describe. The low pass filter reduces the 800 mhz energy an additional 60 db or so to help isolate your 2 mtr repeater from the 800 mhz repeaters. I also have a dual isolator on the output of my transmitter before it goes into my 6 cavity celwave BpBr 2 mtr duplexer. You will probably need both the low pass filter in your feed line and dual isolator on your transmitter to solve this kind of problem. Your other solution will be to move your antenna out of the other antennas main RF field. John, K7JL Message: 17 Date: Tue, 4 May 2004 20:03:48 -0400 From: Richard Sharp, KQ4KX [EMAIL PROTECTED] Subject: 2m repeater IMD issue Hi gang, Our club was allowed space (no cost) on top of a 400' tower using an existing 7/8 line. The existing UHF antenna was replaced (by the club) with a PD220-2 (142~150 range) antenna. The coverage is very good. However, on occasion when users with HTs or during a squelch tail the IMD is audible. I have added cavity filters to both the rx tx and the IMD is still there. I've looked at it with a spectrum analyzer (connected to the rx port of the duplexer) and I do see IMD when the 2m repeater's tx is on. Although, since I have the cavity filters inline the IMD is only noticeable within the passband of the rx cavity. The IMD levels are around -90dBm give or take a couple. Ok, here's the source of the IMD. At the top of this tower is also six other transmit antennas that are for 800MHz trunk systems. A total of 30 channels. The top platform is rather large but the closest 800 antenna to the 2m antenna is about 5 feet. The farthest is about 12 feet. Of course, these antennas are in the same horizontal plane with the 2m antenna. Signal levels in the 800 tx band that I see at the TX or RX port of the 2m duplexer without the bandpass cavity is about -40dBm. With the cavity about -75dBm. I'm thinking of just moving the antenna about 50' down the tower (where there's no other antennas mounted) to eliminate the problem. My thinking is that with the extreme RF levels present on the top platform that I'd have to spend a fortune in filters on the 2m equipment perhaps the 800 stuff that it'd just be cheaper to move the antenna from the top. Any thoughts? I was looking into a solution using an isolator but after further research I discovered that a VHF isolator will ALLOW RF into the 2m transmitter that is in the 800MHz range. With the bandpass cavity inline there's no VHF (150~160) or UHF (450~470) signals that show up on the spectrum analyzer. Only the co-site 800MHz stuff is getting through the cavity. Richard 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] audio problems
Robert, Have you looked at the audio level coming out of the repeater receiver? I sometimes find the Mastr II and Exec II receiver audio output level pot intermittent or dirty which results in what you are experiencing. This Pot is located in the shielded compartment by the detector. This sets the audio output level going to the Volume Unsquelched High output. John, K7JL Message: 11 Date: Thu, 25 Mar 2004 07:41:29 -0500 From: Robert W Burton [EMAIL PROTECTED] Subject: audio problems We have a hub repeater within our system that is having a problem. (http://www.georgiaskywarn.com ) Every so often the audio level just drops. No distortion, no intermod mixing that we can hear...the level of the audio just gets softer. No loss of signal either. The repeater is located on a tower that has 2 fm radio stations running lots of power on it. One of the radio stations has caused some problems with the local school and neighboors who are just underneath it's footprint. Problems with them getting into t.v. , intercoms, etc. This problem will just happen then fix itself. There are several pagers, cell phone and one digital t.v. (I think there still in businessif your in the Atlanta area it's Bellsouth's thing with the dishes in the tops of treesit's really too funny to see these things ;-) on this same tower. The repeater is a MCC converted GE Master Exec II with a SCom7 controller. Thanks, Robert 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] 440 - 450 Low in High Out Repeaters
Skipp and group, Yearsago back in the 60's when we planned our Amateur 420-450 band we probably were considered a "rural" area. Now we haveevery commercial two way frequency,FM and TV Broadcast and even the 2 Mtr and 440 Amateur bands are full with transmitters and they are at multiple repeater sites. Even today, my 449.500- repeater is currently co-located with a broadcasters 450.5125+ repeater at an 8800 Ft site andthey both work fine.They are on separate DB408 antennas. This is at a site that uses every frequency known to the broadcast, 2 way and paging world. Several other Ham repeaters are located on this mountain. By the way, all of the broadcasters that I know of have repeaters that transmit in the low end of450 Mhz. I thought that this was the same all over the country. Maybe this is different in your area. All I am trying to say is that with the Broadcasters repeaters transmitting near the low end of450 Mhz, it seems prudent that the amateur repeaters would want some frequency isolation from them especially at a co-located site and would want to use a low input frequency for their repeaters. It just make sense! I guess your local bandplan will take precident in how you operate with either a low input or high input. Our Ham repeaters use top quality Cavities, Duplexers, Combiners where needed, Heliax cables and rugged antennas to exist in the high RF environment. Over the years, Ihave built and managedCommercial Repeater sites that have hadhundreds of repeaters which included 138-174,450-470, 806-866, 900 mhz repeaters and oh yeah that 940.225 Mhz Skytel pager running 500 watts output. We even had a full power CH 14 TV transmitter on site! Life gets real interesting in this environment.Combiners and antenna management are a must in high RF environments! By the way, all we had back many years agowereGEmobiles and repeaters so we just bought the crystals for the Ham frequencies we wanted to operate on. Thanks and 73's John, K7JL http://www.ussc.com/~uvhfs/snowlink.html Message: 5 Date: Thu, 11 Mar 2004 21:32:40 - From: "skipp025" [EMAIL PROTECTED]Subject: Re: 440 - 450 Low in High Out RepeatersHello Sailors, As I replied direct to John, the "trend setters" statement was made tongue in cheek. His reasons for their bandplan make sense in rural areas. When you get into large metro areas, all the rules go out the window at busy mountain tops and repeater sites. You just can't hide from that nearby 1/4kw paging transmitter...Receiver distribution and transmit combiner systems becomea lot of science, experience, budget management and magic with mirrors. Cheers Skipp Yahoo! Groups Links To visit your group on the web, go to:http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Repeater-Builder] 440 - 450 Low in High Out Repeaters
Skipp, You made a comment about your local 440 Amateur repeaters using the High in and Low out plan and by doing this you suggest that your area in California is a trend setter. I thought that I would share some information about the logic that went into our band planning and actions here in Utah. In Utah and neighboring States, our 440-450 repeaters use low in and high out. Most of our long standing repeaters chose this plan because they were co-located on mountain top radio sites with commercial equipment. The commercial repeaters transmitted in the 450-455 Mhz band. As an example, we did not want to have our amateur 449.500 Mhz receiver next to a 450.250 Mhz transmitter that was used by the local TV stations remote pickup broadcast repeater. Our our antennas were restricted to have only 40 ft or less horizontal separation from each other. The desense would have been difficult and expensive to cure with only 750 khz of frequency separation between the transmitter and receiver at 450 Mhz. We chose to put our receiver inputs low in and by using the 444.500 Mhz frequency to receive, we gained 5 more megahertz of frequency isolation from the commercial transmitters. We still have to use bandpass type duplexers with band reject on our repeater to co-exist with the commercial transmitters. Yes, we do have a dual isolator in our transmitter output to the duplexer to keep the IM products down to acceptable levels.. This is only one of several examples I could show you as to why Utah chose the Low in and Hi Out Plan for our 440 Repeaters. Maybe you do not have this kind of problem in your local area. I'm sure that's one of the reasons why the band plan is different in other parts of the country. On our 420-435 Mhz band, we have links that use a 10 Mhz or wider split. Some links use the 5 Mhz split. We chose this because this lowers the cost of Duplexers and Cavity filters. We planned our 420-450 amateur band frequencies to work the best in our local RF environment without having costly solutions. John, K7JL Utah VHF Society http://www.ussc.com/~uvhfs/ http://www.ussc.com/~uvhfs/frqcoord.html Message: 6 Date: Wed, 10 Mar 2004 22:09:11 - From: skipp025 [EMAIL PROTECTED] Most 440 to 450MHz Amateur Repeaters in my area use 5MHz offsets, with the transmitter on the lower frequency. I believe much of the country uses the reverse. But we here in Northern California are always the trend setters. :-) Linking 420-425MHz range amateur duplex links in Northern California use a 3MHz offset, as does the 480-490 range T Band repeaters. cheers skipp www.radiowrench.com 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] GE Multi-Receiver Power Supply
Kevin, I have that manual in a .pdf file that I will send to you directly. It is GE LBI-30731. Let me know when you get it. Enjoy, John Lloyd, K7JL [EMAIL PROTECTED] Message: 12 Date: Tue, 03 Feb 2004 13:55:04 - From: w5kgt [EMAIL PROTECTED] Subject: Multi-Receiver Power Supply I'm in need of a LBI manual for a GE rack mount multi-receiver power supply. Part # PL19E50707G4 Rev A. Will pay for new or good copy. Thanks, W5KGT Kevin Thomas www.w5kgt.com 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] MSR2000 Power Supply Schematic Wanted TPN1191A
Is there some one on this list that has a schematic of the MSR2000 Power Supply in either a .PDF format or in a scanned image that you could email to me? The Power supply is a part number TPN-1191A and it is from a UHF Repeater. I need to know the output voltages and the pin out that it should be sending to the radio. I am guessing that it outputs 9.6 and 12 volts from working on Micor base stations. There is a small low current 6 pin Molex plug on the power supply that goes to the radio. The High Current voltage for the PA is connected to the output filter Cap. It has a shorted filter cap that I need to replace. It is Motorola part number 25D82253N01C and its value is 64,000 uf at 20 WVDC. It is 2-1/2 inches round and 4-1/4 tall. Any help will be appreciated. Thank You, John Lloyd, K7JL Intermountain Intertie http://www.ussc.com/~uvhfs/snowlink.html Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
