[Repeater-Builder] Re: Stop the Madness
Guys, thanks for the interesting discussion. --- In Repeater-Builder@yahoogroups.com, MCH [EMAIL PROTECTED] wrote: The FCC has imposed exactly the same thing on two repeaters that tried to share a frequency but where there was mutual interference. It's never lasted. One of the repeaters has always got fed up and gone off the air. Joe, I think imposed vs voluntary makes this very different. The voluntary method should have a much better shot at success. Seems like something a reasonable coordination body might accept with a clause signed by both parties that if the relationship falls apart and interference between the machines starts happening, BOTH machines become uncoordinated and the pair heads back to the pool. And, if there's no waiting list, all you're out is getting crystals and a duplexer retune. Not a bad risk for getting your repeater on the air years earlier. You're putting the coordinator in the position of being the court. Maybe agreements like this should only be done by clubs, with the club as the entity which holds the coordination, and maybe even legally owns the hardware. That way, the dispute is kept within a body with bylaws and its own internal dispute mechanisms. If SNP pairs work, why not SVP? (Shared with Voluntary Protection) Same thing as SNP. No need to debate what the meaning of is is. SNP and SVP would be different in one important way. SNP means no protection, and lets five more guys pile on your pair with no cooperation with existing repeaters, other than maybe picking a PL tone. SVP would protect against new repeaters on your pair. Could be a big difference. Why should a repeater go off the air simply because it's a PROVEN machine? What next? Oh - you've had your license for 30 years. It's time to make room on the bands for less experienced operators? I'm not sure where you get the bit about forcing repeaters off the air just because they're proven. I'm saying if the coordinated entity ceases operation, (individual dies, club disbands, etc) that pair should go back to the pool, not be sold to the highest bidder while there's a waiting list for coordination. As far as the 30-year comment: You'd need something more than just how long someone's held a pair as justification to ask for it to be taken away. More than that, pulling a pair for arbitrary reasons never works. You need something concrete. Guys, not sure where you're getting this. I may have phrased badly. I'm not suggesting arbitrarily pulling a coordination based on time held. I'm only saying that just holding a coordination for 30 years doesn't mean it belongs to your heirs and assigns. It ought to go back to the pool when you stop using it. When only coordinators can get pairs, or someone puts a beacon ID on a mobile rig in his garage to hold a pair, or two old handhelds and a mobile duplexer get sold for $5K because they're supposedly a coordinated repeater, the system is broken. Gotta find some way to get rid of the waiting list, consistent with the spirit of the amateur service. As for your clueless user and Motorola or GE vs. new-Asian-import- repeater-with-no-heatsink, I hear ya, brother. Anyone who's had to keep a busy system running figures that one out early on. 73, Paul, AE4KR
RE: [Repeater-Builder] Repeater conversion
Randy, There's nothing to convert; the 4EF4A3 Mastr Progress Line power amplifier is already designed to cover the 6m (50-54 MHz) band. My data identifies this unit as a continuous-duty amplifier that is rated at 150-300 watts, using a 4CX250B tube. It's a real workhorse. It will require careful tuning per the instructions found in LBI-4100, of course, but I don't think any modifications are needed. However, that statement applies only to the power amplifier; the other RF components of a 6m repeater, depending upon their model numbers, may require some modification for peak performance in the 6m band. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Randy Sent: Wednesday, December 26, 2007 10:51 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Repeater conversion I have access to a GE Power Amp Model# 4EF4A3 The freq is 42-54 MHz Can this repeater be converted to 6m (easily)? I also have the Duplexer.
RE: [Repeater-Builder] Repeater
What are the model or combination numbers of these Mastr II radios? What kind of help do you need? 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of alton311 Sent: Wednesday, December 26, 2007 2:05 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Repeater I have 2 Uhf GE Master II I need Help?
[Repeater-Builder] Repeater conversion
I have access to a GE Power Amp Model# 4EF4A3 The freq is 42-54mhz Can this repeater be converted to 6m (easily)? I also have the Duplexor.
[Repeater-Builder] Repeater
I have 2 Uhf GE Master II I need Help?
[Repeater-Builder] Astro Repeater using Maxtrac
Hi... I am looking for guidance to construct an Astro Digital repeater using two Motorola Maxtrac radios in the 460Mhz band. From what I understand is that they are also called a transparent repeater. I already have the radios, power supply, programming software and equipment, and duplexer. What are my next steps? Any help will be appreciated, thanks!
[Repeater-Builder] New file uploaded to Repeater-Builder
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the Repeater-Builder group. File: /Simple P25 Repeater /ASTROCapableRepeaterUtilizing2UHFMotorolaMaxtracRadios.pdf Uploaded by : efj44 [EMAIL PROTECTED] Description : Simple P25 Repeater using 2 Motorola Maxtrac Mobiles . You can access this file at the URL: http://groups.yahoo.com/group/Repeater-Builder/files/Simple%20P25%20Repeater%20/ASTROCapableRepeaterUtilizing2UHFMotorolaMaxtracRadios.pdf To learn more about file sharing for your group, please visit: http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.htmlfiles Regards, efj44 [EMAIL PROTECTED]
[Repeater-Builder] Re: Astro Repeater using Maxtrac
--- In Repeater-Builder@yahoogroups.com, ntoda96818 [EMAIL PROTECTED] wrote: Hi... I am looking for guidance to construct an Astro Digital repeater using two Motorola Maxtrac radios in the 460Mhz band. From what I understand is that they are also called a transparent repeater. I already have the radios, power supply, programming software and equipment, and duplexer. What are my next steps? Any help will be appreciated, thanks! I just Put a PDF File on this group for Using 2 Motorola Maxtrac Mobiles for a Simple P25 Repeater . Steve efj44 .
RE: [Repeater-Builder] Re: Astro Repeater using Maxtrac
Have fun with the fcc enforcement people because that has no place in the biz uhf band let alone is it what its designed to be used for. -Original Message- From: Steve [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Repeater-Builder@yahoogroups.com Sent: 12/27/2007 11:47 AM Subject: [Repeater-Builder] Re: Astro Repeater using Maxtrac --- In Repeater-Builder@yahoogroups.com, ntoda96818 [EMAIL PROTECTED] wrote: Hi... I am looking for guidance to construct an Astro Digital repeater using two Motorola Maxtrac radios in the 460Mhz band. From what I understand is that they are also called a transparent repeater. I already have the radios, power supply, programming software and equipment, and duplexer. What are my next steps? Any help will be appreciated, thanks! I just Put a PDF File on this group for Using 2 Motorola Maxtrac Mobiles for a Simple P25 Repeater . Steve efj44 . Yahoo! Groups Links
[Repeater-Builder] Re: UHF duplexers and preamps
My turn... Hi Paul, We are currently applying for a 7.6Mhz split UHF repeater here which means we will be able to do away with the old and lossy large cavity filters for our old 1.6Mhz split repeater and use a commercial unit. Wow, kind of hard for some of us to imagine anything but the standard 5MHz UHF Repeater Offsets found used in the US 440 to 470 MHz range. No big deal really but I/we often wonder if the Amateur Radios you folks purchase easily program these splits as standard or if you have to program them in as what we call an odd split? We've already tried a loaned Procom duplexer and the results are most promising with no TX desense or noise noted on the RX and minimal loss of TX power. ... which is what a duplexer is hopefully supposed to do for you. As we now need to purchase a filter for ourselves I've come across these on Ebay, has anyone any experience of them? http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItemitem=160192454185 What I'm seeing is a picture of a common vhf flat-pack duplexer (also known as a mobile duplexer by many) set up as an auction to offer you to be able to select a UHF or VHF duplexer selection once you make high bidder at the auction close. In other words it's a rather generic auction listing. Looking through the archives I can see some groups use pre amps on 70cm repeaters, this isn't something we've considered before but presuming they fit between the RX and the duplexer how effective are they? A preamplifier can make a night and day difference in repeater coverage only if it's properly engineered (and installed) into a repeater system. The issue with adding an external preamplifier is properly protecting it from unwanted energy, which includes the transmitter, external (outside) signals and lightning. Yes, on a repeater the preamplifier normally installs in front of the receiver and the filter network in front of it, which may be a duplexer or pre-selector assembly. If they are worth considering what make and model is favourite? The question that always makes the repeater preamplifier people offer an answer regarding their one favorite manufacture. A number of people make pre-amplifiers and pre-amplifiers with built in/on integrated filters of various sizes. Brand names include Angle Linear, ARR, SSB Electronics, Hamtronics, Spectrum, Ramsey... yadda, yadda. The most popular repeater pre-amplifiers are probably sold by ARR and Angle Linear. I use many of both brands in various commercial and Amateur Radio systems around my end of California. http://www.advancedreceiver.com/page5.html or http://www.anglelinear.com/ Like everything else the addition of a pre-amplifier should be well thought out else or you'll cause yourself more grief than you thought possible... hence the reason asking for opinions here on the group is a good thing. Under the pre-amp description there are at least four major types available... so again more questions to the group will help you sort out a viable option for your system. Making a full circle we arrive back at the flat pack duplexer you see in that Ebay auction. Normally that type of duplexer is not used stand-alone with an additional receiver pre-amplifier. There is simply not enough protection provided by that type duplexer operation. You would need to obtain a more conventional band-pass, band-reject type duplexer or include some type of quality band-pass filter in front of any added external pre-amplifier when using a flat-pack unit. OK, my fingers hurt... chow skipp
[Repeater-Builder] National Radio Quiet Zone
Well if You like Radio and Listening to Things , You should really enjoy this Video I would Love to Have this Guys job and actually see what kind of Equipment He has in that Van http://tinyurl.com/2uvz93 PS I wonder how the ham radio operators deal with this if any live around this area Don KA9QJG
[Repeater-Builder] R1225 repeater
A while back I posted an inquiry regarding an R1225 repeater I was looking at for another. it was deaf as a fence post. Well, today I had a chance to finally open this thing up and get a look-see. (This took so long because I've been ridding myself of a number of kidney stones.) Anyway, the front end of the receiver is burnt to a crisp - my best guess is that it got hit with strong incoming RF that was not blocked by a mis-tuned duplexer. or the owner hooked the duplexer up backward. (I think this was discussed previously.) Anyway, in order to get this thing going, I am in need of the receive board layout diagram and a parts list. With the radio oriented so the RX antenna connection is at the lower left, the components that are toasted are just above the antenna connection. (They all look like SMC capacitors, but without the board layout and parts list, I can't be certain - nor can I determine proper replacement values.) If anyone can help, I'd be much obliged! Thanks in advance! Mark - N9WYS n9wys (at) ameritech (dot) net
RE: [Repeater-Builder] R1225 repeater
Mark, You should order a copy of the R1225 service manual 6880905Z53 from Motorola Parts while it is still in print. It costs about $13, less than 1/3 the cost to make a color copy of it. The receiver front end has back-to-back diodes to provide some protection against high voltages, but a lightning strike or a misconnection to a transmitter can certainly fry them. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of n9wys Sent: Thursday, December 27, 2007 2:12 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] R1225 repeater A while back I posted an inquiry regarding an R1225 repeater I was looking at for another. it was deaf as a fence post. Well, today I had a chance to finally open this thing up and get a look-see. (This took so long because I've been ridding myself of a number of kidney stones.) Anyway, the front end of the receiver is burnt to a crisp - my best guess is that it got hit with strong incoming RF that was not blocked by a mis-tuned duplexer. or the owner hooked the duplexer up backward. (I think this was discussed previously.) Anyway, in order to get this thing going, I am in need of the receive board layout diagram and a parts list. With the radio oriented so the RX antenna connection is at the lower left, the components that are toasted are just above the antenna connection. (They all look like SMC capacitors, but without the board layout and parts list, I can't be certain - nor can I determine proper replacement values.) If anyone can help, I'd be much obliged! Thanks in advance! Mark - N9WYS
RE: [Repeater-Builder] R1225 repeater
Thanks Eric. I was kinda hoping that someone had the manual and I could get just the RX board layout and parts list pages... Even at $13, I'd rather not spend the money for a one-time use - but it looks as if that's the way I'm going to have to go. Thanks and Happy New Year, Mark - N9WYS -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of Eric Lemmon Mark, You should order a copy of the R1225 service manual 6880905Z53 from Motorola Parts while it is still in print. It costs about $13, less than 1/3 the cost to make a color copy of it. The receiver front end has back-to-back diodes to provide some protection against high voltages, but a lightning strike or a misconnection to a transmitter can certainly fry them. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com On Behalf Of n9wys A while back I posted an inquiry regarding an R1225 repeater I was looking at for another. it was deaf as a fence post. Well, today I had a chance to finally open this thing up and get a look-see. (This took so long because I've been ridding myself of a number of kidney stones.) Anyway, the front end of the receiver is burnt to a crisp - my best guess is that it got hit with strong incoming RF that was not blocked by a mis-tuned duplexer. or the owner hooked the duplexer up backward. (I think this was discussed previously.) Anyway, in order to get this thing going, I am in need of the receive board layout diagram and a parts list. With the radio oriented so the RX antenna connection is at the lower left, the components that are toasted are just above the antenna connection. (They all look like SMC capacitors, but without the board layout and parts list, I can't be certain - nor can I determine proper replacement values.) If anyone can help, I'd be much obliged! Thanks in advance! Mark - N9WYS Yahoo! Groups Links
Re: [Repeater-Builder] Repeater
At 02:05 PM 12/26/07, you wrote: I have 2 Uhf GE Master II I need Help? Saying that is like telling an auto mechanic I have two cars, I need help. Telling us the model number, the combination number, and what the problem is will give us a much better chance of helping you. Mike
Re: [Repeater-Builder] National Radio Quiet Zone
It seems the try to make it peaceful arrangements. I would like to have some of their tools as well. I wonder what a EMI/RFI finder gets paid? It's too bad that the FCC doesn't listen to those who have the EMITT like trucks when interference is found! HDTV air broadcast, BPL, and the lists goes on! Perhaps that would be a neat project to build the ultrasound receiver. Lord knows noise sources the power companies have radiating! ~Benjamin, KB9LFZ Don [EMAIL PROTECTED] wrote: Well if You like Radio and Listening to Things , You should really enjoy this Video I would Love to Have this Guys job and actually see what kind of Equipment He has in that Van http://tinyurl.com/2uvz93 PS I wonder how the ham radio operators deal with this if any live around this area Don KA9QJG
RE: [Repeater-Builder] National Radio Quiet Zone
__I did a little Research and Found Some Info on the Quite Zone At http://www.gb. http://www.gb.nrao.edu/nrqz/ nrao.edu/nrqz/ Also did a Search at QRZ with the Zip Code 24944 List a few Hams , I did not find one with the Name Wesley Sizemore with The Great Job of tracking down Signals I would still like His Job But I bet He has Few friends in that area other then the ones He works for . 73 De Don KA9QJG _
