[Repeater-Builder] New Repater Sytem Help!!!
We installed a small repeater system on our new fire station and are not getting the coverage we expected at all. Our antenna sits about 27m up on top of the building. The repeater is a 50watt VHF w/ duplexer. I believe it's the old coax we are using, which I think is about 15 yrs old and may have been hit by lighting in the past. If anyone can help us out it would be great!! I have many questions but for now,,, what type of coax should we get if this needs to be replaced? What about a lighting arrestor, necessary? Would a rusty, old tripod work fine or will it cause some kind of interference? and with this height, about what kind of range can we except (we use mostly 5watt portables). Thanks for the help!! We are trying to save money in our small dept by troubleshooting it the best we can before calling the pros lol. Please e-mail me w/ your advice, or questions [EMAIL PROTECTED] Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Service Manuals
Check out www.batlabs.com They may have the manual(s). If not, they will have some other good info for your radios. William Vines - Original Message - From: Frederick Wong [EMAIL PROTECTED] Date: Monday, November 21, 2005 7:43 pm Subject: [Repeater-Builder] Service Manuals I would like to know if any of u have or know any ways to get these radios' service manuals: GM300, GM950e/i/plus, GM338. All are Motorola radios. Thank you Fred Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Digest Number 3456
Thanks for the info! This one is in good condition, except that the four programming switches have had the bat handles broken off! Strange. Another project! 73 Tom/W4OKW snip--- As previously mentioned, that is a digital metering panel (DMP) for an MSF5000 station. snip--- Either meter is highly desirable when working on MSF5000s, however the DMP gives you a much better look at the inner workings of the station, and also lets you activate certain conditions such as manual PTT or PL disable, via four data switches under the LEDs. Bob M. == Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Digest Number 3456
Those switches are not available from Motorola - I had one with the same problem. Eventually I bought a junk meter with other parts missing and swapped the switches. They're just SPDT switches that happen to mount vertically with a support bracket that solders into the circuit board. I've seen other switches just like it that might possibly work. I know several companies that can make them; the problem is buying a small quantity. Bob M. == --- Clarke, Tom VX-20 OPS [EMAIL PROTECTED] wrote: Thanks for the info! This one is in good condition, except that the four programming switches have had the bat handles broken off! Strange. Another project! 73 Tom/W4OKW snip--- As previously mentioned, that is a digital metering panel (DMP) for an MSF5000 station. snip--- Either meter is highly desirable when working on MSF5000s, however the DMP gives you a much better look at the inner workings of the station, and also lets you activate certain conditions such as manual PTT or PL disable, via four data switches under the LEDs. Bob M. __ Yahoo! Mail - PC Magazine Editors' Choice 2005 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/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
Bob, just a suggestion, has he taken the repeater away from the site, hooked it to another antenna to see if he might be riding along a frequency there at the tower site. He could be pulling something in from a second harmonic there. The only reason I mention this, is a friend of mine had a 440 repeater at a cell site and had something similiar happen. He took it to another antenna, and the problem was gone. I know he ended up installing a circulator, but I also think the cell site ended up installing a peice of equipment, but not sure what they put in. That was about three years ago, and the whole entire crew is gone, so not sure if I could find out what they installed.Mathew "Bob M." [EMAIL PROTECTED] wrote: Hi. A local UHF repeater is having massive desenseproblems. Everything is clean with a dummy loadattached to the duplexer, so we know it's a problemwith the connectors, coax, antenna, or jumper betweenthe two. This is a two-month-old system at a cellphonesite; nothing else there. The repeater is the onlything on 444.5 MHz.I'd like to try a circulator before buying one, sinceif it doesn't help the situation, it's a waste ofmoney to have it there. I would agree however that itspresence would be mandatory if this was a busy site,but for now it's just his repeater and all thecellphone equipment.He's running 200 watts out of a Henry amp, through aTxRx 4-section duplexer. We see a 20dB rise in thenoise level at the Rx port when the transmitter comeson, with the system connected to the coax/antenna.Absolutely no change with a good dummy load attachedto the duplexer's output. We even have desense withthe 20 watts out of the exciter (power amp bypassed).The antenna is a super stationmaster cut for the440-450 band. The coax is 7/8 and there's about 150 ftof it.So if someone has a circulator and reject load thatwould be rated for 200 watts to pass through it,please contact me. If there's a way we could try it,and buy it if it helps the situation, that would beideal.Thanks.Bob M.__ Yahoo! FareChase: Search multiple travel sites in one click.http://farechase.yahoo.comYahoo! 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/ Yahoo! FareChase - Search multiple travel sites in one click. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Looking for a UHF Circulator and load
On Tue, 22 Nov 2005, Ken Arck wrote: I'd like to try a circulator before buying one, since if it doesn't help the situation, it's a waste of money to have it there. ---Aside from presenting a pretty much constant 50 ohm load to your xmtr, why do you think a circulator will make a difference as far as desense is concerned? Well, for one it will limit any locally generated mixing products resulting from rectification in the PA transistors. -- Kris Kirby [EMAIL PROTECTED] BIG BROTHER IS WATCHING YOU! This message brought to you by the US Department of Homeland Security and the now-permanent PATRIOT Act Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
At 04:27 PM 11/22/2005 +, you wrote: Well, for one it will limit any locally generated mixing products resulting from rectification in the PA transistors. ---Yes it will. But that is not the cause of desense, that is one of the causes of intermodulation products. Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
At 08:15 AM 11/22/2005 -0800, you wrote: I once had an Exec II RFPA that didn't like the duplexer load it was TXing into. Had massive desense unless there was a circulator between the TX duplexer. ---Makes sense. I know all about PA's driving a reactive load :-) Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net 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: what is the Flat audio ? and what is the applicaion for it
Could it be opposite of Sharp audio??? Chris n6icw At 08:26 PM 11/21/2005 -0500, you wrote: No, Ken. Flat audio is what you get when your HT is run over by a pavement roller. ---Unless it's a vibrating pager that is run over. Then you have a pancake motor. Ken YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] Looking for a UHF Circulator and load
The resistive load isn't an antenna either. Neil Ken Arck wrote: At 08:15 AM 11/22/2005 -0800, you wrote: I once had an Exec II RFPA that didn't like the duplexer load it was TXing into. Had massive desense unless there was a circulator between the TX duplexer. ---Makes sense. I know all about PA's driving a reactive load :-) Ken -- Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
At 09:09 AM 11/22/2005 -0800, you wrote: The resistive load isn't an antenna either. ---I generally face little resistance when it comes to antennae... Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] CTCSS or DCS
My 2 cents worth... A filter is not going to help if it is on your input. Depending upon how much signal you have from your remote site, I would think increasing the squelch level to the point that the un-wanted signal will not open the squelch, but low enough that your remote site can still get in would be an easy way to deal with it for now. Assuming you have enough signal to quiet the receiver effectively without IX from the TV transmitter causing problems. You mentioned that your remote site covers it effectively? I notice you are a ZL, and I don't know what the rules are there... over here in the US it would be classified as a Part-15 device. In the US a Part-15 device cannot cause IX to a licensed service, and must accept any IX. Best neighborly bet is to hunt down the offending device, and see if it can be set to another frequency. If the party was un-cooperative, you file an official complaint, and then they get an official letter from the FCC instructing them to cease operation of the device. But as I said.. not sure of the rules in ZL-land. I have the exact same issue on 6m in my neighborhood.. on 50.247 there is a rabbit generating a wide-band FM signal... and haven't had oppurtinuty to hunt it down yet. I can clearly hear the audio from someone channel-surfing. I have noticed that if I bring my beams on azimuth (700w in a 2 x 6el phased stack), and run WSJT for a while... it goes away. But it always comes back. good luck, mike -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Kevin Natalia Sent: Tuesday, November 22, 2005 11:12 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] CTCSS or DCS Hi All, We have run into a problem with some local interference getting into one of our link radios. It is believed to be coming from one of the TV home transmitters, that one can buy from the local appliance shops. It is producing a signal right on teh input of our link. I have put an extra filter in line, but this did not fix it. I really do not want to do through the hassel of trying to get another set of freqencies at this stage. Shoudl add that when the RX is receiving a signal from the TX link, it overrides the interference nicely. The interference is just enough to open the squelch. Have thought about putting either CTCSS, or a newer DCS TX/RX boards in the link system. I have read somewhere that DCS is the better way to go. If this is the case, where is the best place to purchase boards to fit inside our radios. We are using Tait T345 and T346 gear. Any information will help point us in the right direction. Regards Kevin, ZL1KFM. Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
If anything is coming back down the antennaand through the duplexer and mixing in the PA, the circulator will prevent or reduce that effect. Bob M. == --- Ken Arck [EMAIL PROTECTED] wrote: At 06:00 AM 11/22/2005 -0800, you wrote: I'd like to try a circulator before buying one, since if it doesn't help the situation, it's a waste of money to have it there. ---Aside from presenting a pretty much constant 50 ohm load to your xmtr, why do you think a circulator will make a difference as far as desense is concerned? Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net __ 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/
Re: [Repeater-Builder] CTCSS or DCS
This repeater is in the middle of nowhere. The nearest house is at least 1/2 mile away. No link radios are involved. The repeater itself, when connected to the antenna, is the only thing putting out energy on 444.5 MHz. We see a rise in noise level on the receiver port of the duplexer when the transmitter is on, and this is not present when the repeater is feeding a dummy load. Thanks for the thought, however. Bob M. == --- Kevin Natalia [EMAIL PROTECTED] wrote: Hi All, We have run into a problem with some local interference getting into one of our link radios. It is believed to be coming from one of the TV home transmitters, that one can buy from the local appliance shops. It is producing a signal right on teh input of our link. I have put an extra filter in line, but this did not fix it. I really do not want to do through the hassel of trying to get another set of freqencies at this stage. Shoudl add that when the RX is receiving a signal from the TX link, it overrides the interference nicely. The interference is just enough to open the squelch. Have thought about putting either CTCSS, or a newer DCS TX/RX boards in the link system. I have read somewhere that DCS is the better way to go. If this is the case, where is the best place to purchase boards to fit inside our radios. We are using Tait T345 and T346 gear. Any information will help point us in the right direction. Regards Kevin, ZL1KFM. __ Yahoo! Mail - PC Magazine Editors' Choice 2005 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/
Re: [Repeater-Builder] Re: Looking for a UHF Circulator and load
At 06:41 PM 11/22/2005 -, you wrote: Because all that unmatched stray rf is very often looking for some place betta' (or worse) to go. though I wouldn't qualify it as a fix for desense. ---That's my point. The symptoms (and causes) of intermod are not the same as the symptoms (and causes) of desense. I can see a circulator being used to present a non-reactive load to a PA (which may settle it down and remove *it* as a cause a desense) but not due to a circulator's moreknown? function Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
I looked at the duplexer with a spectrum analyzer and a return loss bridge. It's making spec (100dB rejection) on each side. PB loss is 1.1dB. I did notice that the return loss indication on the SA showed a very nice sharp deep null (over 60dB) when looking into one port, while the other port was quite rounded at the bottom and a lot wider, maybe only going down to -45dB. As the duplexer was not mine and is still under warranty and had just come back from being checked out by TxRx, I did not play with any of the tuning. We also tried the repeater running on my spare Celwave 6-cavity pass/reject duplexer which has worked fine before. This didn't help the situation at all. If the PA and duplexer weren't happy together, wouldn't I also get desense when running on the dummy load also? Remember it's perfectly happy on a 500w Bird load. We see no rise in signal level (down at -130dBm) on the receive port of the duplexer. Bob M. === --- [EMAIL PROTECTED] wrote: At 08:09 11/22/2005, you wrote: At 06:00 AM 11/22/2005 -0800, you wrote: I'd like to try a circulator before buying one, since if it doesn't help the situation, it's a waste of money to have it there. ---Aside from presenting a pretty much constant 50 ohm load to your xmtr, why do you think a circulator will make a difference as far as desense is concerned? Ken I once had an Exec II RFPA that didn't like the duplexer load it was TXing into. Had massive desense unless there was a circulator between the TX duplexer. Bob NO6B Yahoo! Groups Links [EMAIL PROTECTED] __ 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/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
At 10:47 AM 11/22/2005 -0800, you wrote: If anything is coming back down the antennaand through the duplexer and mixing in the PA, the circulator will prevent or reduce that effect. ---Absolutely correct. BUT that is not the same thing as desense nor are the symptoms the same. You said the duplexer, taken to a different site, didn't show any desense, I'd suspect VSWR on some port, be it the antenna, rcvr or xmtr one (presenting other than the exact same load on ANY port of a duplexer between its tuning and deployment WILL detune it. That is why it's best to be sure there is a 50 ohm load on each port). Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
At 10:54 AM 11/22/2005 -0800, you wrote: If the PA and duplexer weren't happy together, wouldn't I also get desense when running on the dummy load also? Remember it's perfectly happy on a 500w Bird load. ---You answered your own question. Suspect the antenna, feedline or both. Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
The antenna/coax is showing 0.05w reflected (1/2 of the first minor division) on a 5W element in a Bird 43 with 200 watts feeding the duplexer. From a purely VSWR standpoint, that's acceptable. Whether or not it's 50 ohms is something we did not check yet. Future steps include sweeping the antenna/coax with a site analyzer, then maybe hauling another antenna and a dummy load up to the top of the pole and substituting these for the existing antenna to see which one is giving us problems. I can't speak for the impedances of the PA's output or the receiver's input. I used a known good 50 ohm load when I checked the unit at my house. I didn't check all the ports by feeding power into them and checking for reflected power. Another antenna at the site mounted on the roof does not produce desense. If it weren't so hard to move, we'd take the entire repeater to my site and connect it to my coax and identical antenna. Unfortunately, that still tells us it's a problem with the existing coax/antenna setup. Could be a connector. Could be the short jumper from the coax to the antenna. Bob M. == --- Ken Arck [EMAIL PROTECTED] wrote: At 10:47 AM 11/22/2005 -0800, you wrote: If anything is coming back down the antennaand through the duplexer and mixing in the PA, the circulator will prevent or reduce that effect. ---Absolutely correct. BUT that is not the same thing as desense nor are the symptoms the same. You said the duplexer, taken to a different site, didn't show any desense, I'd suspect VSWR on some port, be it the antenna, rcvr or xmtr one (presenting other than the exact same load on ANY port of a duplexer between its tuning and deployment WILL detune it. That is why it's best to be sure there is a 50 ohm load on each port). Ken -- President and CTO - Arcom Communications Makers of state-of-the-art repeater controllers and accessories. http://www.ah6le.net/arcom/index.html We offer complete Kenwood TKR repeater packages! We are now an authorized Telewave Dealer! AH6LE/R - IRLP Node 3000 http://www.irlp.net Yahoo! Groups Links [EMAIL PROTECTED] __ Yahoo! Mail - PC Magazine Editors' Choice 2005 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/
Re: [Repeater-Builder] Re: Looking for a UHF Circulator and load
At 11/22/2005 10:46 AM, you wrote: [EMAIL PROTECTED] wrote: I once had an Exec II RFPA that didn't like the duplexer load it was TXing into. The duplexer shouldn't be the load... I should have left the word load out. Technically the load was the duplexer followed by a 50 ohm termination. Had massive desense unless there was a circulator between the TX duplexer. Would have been better to provide a proper 50 system through the duplexer to the antenna... but one has to do what one has to do... It was; sorry for the confusion. Bob NO6B 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] fs; UHF CIRCULATOR AND LOAD
M/A 3 PORT CIRCULATOR AND LOAD $165 + SHIPPING MDMSEE AT WWW.MDMRADIO.COMAND YES IT WAS MY INTENTION TO USE UPPER CASE Ted Bleiman K9MDM MDM Radio Ltd - 1629-B N. 31 st Ave Melrose Park, IL 60160 708.681.0300 fax 708.681.9800 web http://www.mdmradio.com - Check it now!! Yahoo! FareChase - Search multiple travel sites in one click. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
RE: [Repeater-Builder] tuning a TFB6024A low-pass filter
nevermind... solved it 0.3dB insertion loss now... mike -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Mike Perryman Sent: Tuesday, November 22, 2005 12:51 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] tuning a TFB6024A low-pass filter A question for the Micor Guru's of the group... I am in process of converting a low-band Micor to 6m and have a quick question.. the only docs I have found for tuning the low-pass filter to 6m meters is to tune for minimum insertion loss... What constitutes an acceptable value for insertion loss? I am not happy with the current -0.68dB to 0.7dB @ 51.9MHz figure I have obtained. And if I scroll the marker over to around 28MHz, I see it drops to around -0.4dB. Is it worth the trouble to optimize this filter? Or will the exciter generally make enough signal that I shouldn't worry about it and move on? It took a little twiddling to get it to this point.. but not opposed to continuing for better numbers.. Any takers on this one? Thanks, mike Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
... only when you hold it out the window ... Neil Ken Arck wrote: At 09:09 AM 11/22/2005 -0800, you wrote: The resistive load isn't an antenna either. ---I generally face little resistance when it comes to antennae... Ken Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
Just out of curiosity, where did the hardline come from, also, it is not Radian by any chance? I heard of that happening once to a guy who bought some cheap hardline, so he thought. Just kicking idea's around here. Mathew "Bob M." [EMAIL PROTECTED] wrote: I looked at the duplexer with a spectrum analyzer anda return loss bridge. It's making spec (100dBrejection) on each side. PB loss is 1.1dB. I didnotice that the return loss indication on the SAshowed a very nice sharp deep null (over 60dB) whenlooking into one port, while the other port was quiterounded at the bottom and a lot wider, maybe onlygoing down to -45dB. As the duplexer was not mine andis still under warranty and had just come back frombeing checked out by TxRx, I did not play with any ofthe tuning.We also tried the repeater running on my spare Celwave6-cavity pass/reject duplexer which has worked finebefore. This didn't help the situation at all.If the PA and duplexer weren't happy together,wouldn't I also get desense when running on the dummyload also? Remember it's perfectly happy on a 500wBird load. We see no rise in signal level (down at-130dBm) on the receive port of the duplexer.Bob M.===--- [EMAIL PROTECTED] wrote: At 08:09 11/22/2005, you wrote: At 06:00 AM 11/22/2005 -0800, you wrote: I'd like to try a circulator before buying one, since if it doesn't help the situation, it's a waste of money to have it there. ---Aside from presenting a pretty much constant 50 ohm load to your xmtr, why do you think a circulator will make a difference as far as desense is concerned? Ken I once had an Exec II RFPA that didn't "like" the duplexer load it was TXing into. Had massive desense unless there was a circulator between the TX duplexer. Bob NO6BYahoo! Groups Links [EMAIL PROTECTED] __ Yahoo! FareChase: Search multiple travel sites in one click.http://farechase.yahoo.comYahoo! 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/ Yahoo! FareChase - Search multiple travel sites in one click. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Repeater-Builder] wanted vhf 2m duplexer
Hi name is Carlos i am from Puerto Rico and i am looking for a duplexer for my 2m repeater. Carlos Quinones WP4MXB e-mail: [EMAIL PROTECTED] web: www.wp4mxb.net __ 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] Flat audio -use of compressor
Good Day I would like to have comment on the use of the compressor on the repeater hardware between the rx and tx units , with that repeater run up using the flat audio principle. What will happen to the existing audio's attack/decay stats? The expeimental unit made for this test- specs for 4ms/100ms Attack/Decay repectively . Thanks Brad __ 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/
RE: [Repeater-Builder] Looking for a UHF Circulator and load
(having email issues today, so if this is a dupe, please ignore) RE: cell mixes and 440 repeater I had a 440 repeater at a site with no other UHF transmitters for probably a mile or two. On an adjacent tower was a cell site (this was back in the early 90's AMPS days). When certain cell channels were active I would get a mix product that fell on or near my receive frequency, manifesting as either feedback squealing or sudden increases in noise levels that made it sound like desense. My transmitter was a Micor driving a GE 1/4 kW tube amp, the duplexer was a 4-cavity Antenna Specialists pass/reject, and rx was a Micor with an ARR GaAsFET. I found that putting a harmonic notch filter (one of those little tunable Celwave jobs) on the output of the duplexer, tuned to the center of the cell site B carrier transmit band, got rid of all of the problems. I didn't investigate further to determine if the mix was happening in my Tx, in the preamp, or the Rx. Before spending money an isolator (which will also require a harmonic filter after it), you might try a cheap test using a shorted quarter-wave stub tee'd into the feedline at the output of your duplexer to see if it makes any improvement. I'd suggest using a piece of 1/2 Heliax for the stub. If you have a spare pass cavity (a real pass cavity, not pass/reject), you might experiment with it on the tx leg of your duplexer, and then on the rx leg, to help determine if you're experiencing a mix in your tx, or in your rx, or perhaps neither. Keep in mind that what appears to be an overall increase in the noise floor might actually be a mix involving wideband digital cellular (e.g. CDMA). FWIW, I've had substantial (and that's an understatement) problems with Henry SS amplifiers being unstable on VHF, UHF, and FM. I've also received amplifiers from Henry that had the wrong low-pass filter in them - an FM amp with a LPF cutoff around 210 MHz comes to mind. I also had a UHF 200 watt ham-band amp that was shipped with NO low pass filter in it. When I called the factory to complain, I was told that Part 97 had no spectral purity specifications for anything operating above 225 MHz so they didn't bother with a filter. The second harmonic was only about -30 dBc. Eventually they took the amp back and put in an LPF. Take a real close look at the spectral output of the Henry while it's operating into the antenna system before spending any substantial time or money trying to fix a non-existant problem elsewhere in the system. --- Jeff -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.362 / Virus Database: 267.13.5/177 - Release Date: 11/21/2005 Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Looking for a UHF Circulator and load
I don't think this is a dupe. The amp IS a Henry 20in/200out job, brand new. It has its own switching power supply mounted on the back. I think they're using 24V MOSFETs now. My 10in/100out amp uses ordinary 14VDC and bipolar transistors. I didn't look directly at the PA output. I do remember looking at signals on the duplexer's RX port at 449.5 MHz and had the span set for about 100 kHz and the noise level was around -120dBm, probably limited by my analyzer's settings. Keying the transmitter caused the noise level to increase by 10dB (20dB with the 200w PA in the circuit), so the problem isn't just present with the PA. It may also have filtering problems, but we haven't gone that far yet. I found the transmit signal at 444.5 was down around -60dBm, which makes perfect sense (20w = +43dBm, and the duplexer has 100dB rejection; that gets me down to -60dBm or so). I saw no other discrete signals (down to the noise level) appear when we keyed the transmitter. The problem was not present when the repeater was first put on the air about a month ago. It has gotten progressively worse, to the point that it's nearly 20dB desense now on the tall antenna up near the cell antennas. The 7/8 coax was already at the site when the UHF repeater connected to it. Whether it's bad or not will be determined by someone with a site analyzer and/or a visit to the top with a dummy load attached. While there is a 17dB gain preamp with a bandpass filter, it was NOT in the circuit during our tests Sunday. I think we also looked up near 890 MHz (2nd harmonic) but only saw a rise in the baseline trace; no definite signal appeared up there when the transmitter was keyed. We don't have any bandpass filters currently available, but might be able to latch on to one if we look hard enough. I think we should go back up to the site and do some more investigating with the spectrum analyzer to answer some of the extremely detailed questions that people are asking. Bob M. == --- 'Jeff DePolo WN3A' [EMAIL PROTECTED] wrote: (having email issues today, so if this is a dupe, please ignore) RE: cell mixes and 440 repeater I had a 440 repeater at a site with no other UHF transmitters for probably a mile or two. On an adjacent tower was a cell site (this was back in the early 90's AMPS days). When certain cell channels were active I would get a mix product that fell on or near my receive frequency, manifesting as either feedback squealing or sudden increases in noise levels that made it sound like desense. My transmitter was a Micor driving a GE 1/4 kW tube amp, the duplexer was a 4-cavity Antenna Specialists pass/reject, and rx was a Micor with an ARR GaAsFET. I found that putting a harmonic notch filter (one of those little tunable Celwave jobs) on the output of the duplexer, tuned to the center of the cell site B carrier transmit band, got rid of all of the problems. I didn't investigate further to determine if the mix was happening in my Tx, in the preamp, or the Rx. Before spending money an isolator (which will also require a harmonic filter after it), you might try a cheap test using a shorted quarter-wave stub tee'd into the feedline at the output of your duplexer to see if it makes any improvement. I'd suggest using a piece of 1/2 Heliax for the stub. If you have a spare pass cavity (a real pass cavity, not pass/reject), you might experiment with it on the tx leg of your duplexer, and then on the rx leg, to help determine if you're experiencing a mix in your tx, or in your rx, or perhaps neither. Keep in mind that what appears to be an overall increase in the noise floor might actually be a mix involving wideband digital cellular (e.g. CDMA). FWIW, I've had substantial (and that's an understatement) problems with Henry SS amplifiers being unstable on VHF, UHF, and FM. I've also received amplifiers from Henry that had the wrong low-pass filter in them - an FM amp with a LPF cutoff around 210 MHz comes to mind. I also had a UHF 200 watt ham-band amp that was shipped with NO low pass filter in it. When I called the factory to complain, I was told that Part 97 had no spectral purity specifications for anything operating above 225 MHz so they didn't bother with a filter. The second harmonic was only about -30 dBc. Eventually they took the amp back and put in an LPF. Take a real close look at the spectral output of the Henry while it's operating into the antenna system before spending any substantial time or money trying to fix a non-existant problem elsewhere in the system. --- Jeff __ Start your day with Yahoo! - Make it your home page! http://www.yahoo.com/r/hs 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:
Re: [Repeater-Builder] New Repater Sytem Help!!!
Just so you don't have to spend more money on a new repeater after a few thunderstorms, a lightning arrestor is a must. A polyphaser is the arrestor of choice on our systems. The old feedline could be the problem as far as your coverage problems go. Some things to help determine what you problem might be are:Is there any desense between your TX and RX? What kind of antenna are you using? Terrain issue maybe?Also I would see about measuring the power out of the coax at the antenna end and do a quick calculation on what your losses are. For a VHF repeater, 1/2" Andrews Heliax is a pretty good choice for VHF for the $$. Andy Yahoo! FareChase - Search multiple travel sites in one click. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] GLB Id'er programming
--- Dan [EMAIL PROTECTED] wrote: Does any one have the proceedure for programming the GLB ID chips.. I believe its just a 2713. I have the programmer but need help with the code. Dave N3CNJ The GLB ID'er used a 2716 eprom. The way it was programmed was to start at address 0 and step up one bit of the ID code at a time. The unit had 8 output lines, but for simplicity it is easier to program all of them the same. A 0 in the programming produced a tone, a 1 produced no tone. The addresses are stepped through at a 10ms-100ms rate, depending on the code speed desired. You need to break the code desired down into dits, dahs, and spaces, then program accordingly, leaving 2 blank bits at the beginning of the programming. For example SOS would be di di di dah dah dah di di di where each di would be one bit programmed to 0, and each dah would be three consecutive bits programmed to 0 (since a dah is three times longer than a di). Spaces are programmed as a 1. Your binary output, starting at memory add and advancing one address each time, would look like: 1101010111000100010001110101011 Once you program your desired ID, the rest of the chip gets filled with 1s. This is the default state when you erase a 2716, its all 1s. Since the chip programs in hex, you will essentially be writing FF or 00 in each address. Again, writing SOS into the chip would look like this: FF FF 00 FF 00 FF 00 FF FF FF 00 00 00 FF 00 00 00 FF 00 00 00 FF FF FF 00 FF 00 FF 00 FF FF FF FF That is all you need to program, the rest of the bits in the chip will stay at FF, which is the erased position. If you want to program different things on the different lines, it becomes more complex, but I think you see the pattern here. Joe __ Start your day with Yahoo! - Make it your home page! http://www.yahoo.com/r/hs Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
Not me, but could have been. I went to buy a piece of 7/8" hardline a few years back, thought the deal was to good to be, then found it was Radian. No the other guy put up 150' of it, only to find it would not work.Mathew Chuck Kelsey [EMAIL PROTECTED] wrote: So how much did you end up with? LOL.ChuckWB2EDVMathew Quaife wrote: Just out of curiosity, where did the hardline come from, also, it is not Radian by any chance? I heard of that happening once to a guy who bought some cheap hardline, so he thought. Just kicking idea's around here. MathewYahoo! 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/ Yahoo! FareChase - Search multiple travel sites in one click. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] CTCSS or DCS
Say Kevin; If the interference is coming form a Part 15 device and IF on a licensed ham freq. it is called a incidental radiator, the FCC does send NAL's. research the ARRl web page for history of incidential radiators good info when you ask the owner to change channels or bands the FCC mails NALs on that as well also monetary forfeitures can be assessed for failure to comply. mark h. Kevin Natalia wrote: Hi All, We have run into a problem with some local interference getting into one of our link radios. It is believed to be coming from one of the TV home transmitters, that one can buy from the local appliance shops. It is producing a signal right on teh input of our link. I have put an extra filter in line, but this did not fix it. I really do not want to do through the hassel of trying to get another set of freqencies at this stage. Shoudl add that when the RX is receiving a signal from the TX link, it overrides the interference nicely. The interference is just enough to open the squelch. Have thought about putting either CTCSS, or a newer DCS TX/RX boards in the link system. I have read somewhere that DCS is the better way to go. If this is the case, where is the best place to purchase boards to fit inside our radios. We are using Tait T345 and T346 gear. Any information will help point us in the right direction. Regards Kevin, ZL1KFM. Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/ begin:vcard fn:Mark A. Holman n:Holman;Mark A. org:Harvest Assembly of God email;internet:[EMAIL PROTECTED] title:Webmaster, IT Student x-mozilla-html:TRUE url:http://www.ab8ru.org version:2.1 end:vcard
Re: [Repeater-Builder] fs; UHF CIRCULATOR AND LOAD
yeah i got your message but i replied in lower case btw happy turkey day . m Ted Bleiman K9MDM - MDM Radio wrote: M/A 3 PORT CIRCULATOR AND LOAD $165 + SHIPPING MDM SEE AT WWW.MDMRADIO.COM AND YES IT WAS MY INTENTION TO USE UPPER CASE Ted Bleiman K9MDM MDM Radio Ltd - 1629-B N. 31 st Ave Melrose Park, IL 60160 708.681.0300 fax 708.681.9800 web http://www.mdmradio.com - Check it now!! Yahoo! FareChase - Search multiple travel sites in one click. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. begin:vcard fn:Mark A. Holman n:Holman;Mark A. org:Harvest Assembly of God email;internet:[EMAIL PROTECTED] title:Webmaster, IT Student x-mozilla-html:TRUE url:http://www.ab8ru.org version:2.1 end:vcard
[Repeater-Builder] Wanted - Parts for RCA 500
Looking a few things for a RCA 500 Repeater; pl reeds - 77hz Mic Please contact me direct. Thanks! Robert KD4YDC Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Flat audio -use of compressor
[EMAIL PROTECTED] wrote: See a blurb I wrote a few years ago on repeater-builder.com regarding audio processing in narrowband FM. That would be here: http://www.repeater-builder.com/tech-info/audioprocessing.html Kevin Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Wanted - Parts for RCA 500
Robert, I think those are the same reeds that are in a Motorola radio, at least in the Vibrasponder style (I think). Man, I did not think anyone else had or knew anything about those old radios! I have four of them here in storage and have been wondering what I am going to do with them. They are really pretty good radios. Paul WB5IDM -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of georgiaskywarn Sent: Tuesday, November 22, 2005 8:45 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Wanted - Parts for RCA 500 Looking a few things for a RCA 500 Repeater; pl reeds - 77hz Mic Please contact me direct. Thanks! Robert KD4YDC Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Wanted - Parts for RCA 500
No they are not - although they look the same same as the Motrac, Mocom-30 70, and Micor encoder reeds ... they are not interchangeable. The internal coupling is the difference. The Motorola K-1000A series reeds seem to work ok though. Neil - WA6KLA Paul Finch wrote: Robert, I think those are the same reeds that are in a Motorola radio, at least in the Vibrasponder style (I think). Man, I did not think anyone else had or knew anything about those old radios! I have four of them here in storage and have been wondering what I am going to do with them. They are really pretty good radios. Paul WB5IDM -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of georgiaskywarn Sent: Tuesday, November 22, 2005 8:45 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Wanted - Parts for RCA 500 Looking a few things for a RCA 500 Repeater; pl reeds - 77hz Mic Please contact me direct. Thanks! Robert KD4YDC Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Wanted - Parts for RCA 500
Paul, I have three RCA Series 700 base stations and some CC20 remotes to add to your 'collection.' Please let me know when you'll be here to get them, Neil Paul Finch wrote: Robert, I think those are the same reeds that are in a Motorola radio, at least in the Vibrasponder style (I think). Man, I did not think anyone else had or knew anything about those old radios! I have four of them here in storage and have been wondering what I am going to do with them. They are really pretty good radios. Paul WB5IDM Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Wanted - Parts for RCA 500
Neil, That's a dirty word right now, I am doing some serious house/garage/shop cleaning. I have thrown out such things as KAAR DT-83's, Sat controllers and BBL System III paging terminals! Paul -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Neil McKie Sent: Tuesday, November 22, 2005 9:26 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Wanted - Parts for RCA 500 Paul, I have three RCA Series 700 base stations and some CC20 remotes to add to your 'collection.' Please let me know when you'll be here to get them, Neil Paul Finch wrote: Robert, I think those are the same reeds that are in a Motorola radio, at least in the Vibrasponder style (I think). Man, I did not think anyone else had or knew anything about those old radios! I have four of them here in storage and have been wondering what I am going to do with them. They are really pretty good radios. Paul WB5IDM Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Wanted - Parts for RCA 500
Neil, I remember that now, it was the 1000 series of reeds that would interchange. Been way to long. Paul -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of Neil McKie Sent: Tuesday, November 22, 2005 9:23 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Wanted - Parts for RCA 500 No they are not - although they look the same same as the Motrac, Mocom-30 70, and Micor encoder reeds ... they are not interchangeable. The internal coupling is the difference. The Motorola K-1000A series reeds seem to work ok though. Neil - WA6KLA Paul Finch wrote: Robert, I think those are the same reeds that are in a Motorola radio, at least in the Vibrasponder style (I think). Man, I did not think anyone else had or knew anything about those old radios! I have four of them here in storage and have been wondering what I am going to do with them. They are really pretty good radios. Paul WB5IDM -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] Behalf Of georgiaskywarn Sent: Tuesday, November 22, 2005 8:45 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Wanted - Parts for RCA 500 Looking a few things for a RCA 500 Repeater; pl reeds - 77hz Mic Please contact me direct. Thanks! Robert KD4YDC Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] CTCSS or DCS
Hi Guys, Thanks for the advise so far. I have just been up to the repeater site today, and have tightened up the squelch some so it does not open so easy. The offending signal is still there, and I can hear it on the input of my mobile radio. For information, here in New Zealand we have a Gov. Radio Frequency dept, however with the recent changes in how they now work, we (Hams) have to do 99% of the work, to track down the offender. Once we have the information, we can forward it to them to process. It can be easier to try and clean it up with CTCSS, change frequency, or remove completely(not an option). With the lack of equipment to track this down, will just have to see what happens, and just try and stop it from getting into our RX. The signal from the link TX, is strong enough to over-ride the interference, and give as a clean link. Good old FM capture effect. Regards Kevin, ZL1KFM. - Original Message - From: Mark A. Holman [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Wednesday, November 23, 2005 3:40 PM Subject: Re: [Repeater-Builder] CTCSS or DCS Say Kevin; If the interference is coming form a Part 15 device and IF on a licensed ham freq. it is called a incidental radiator, the FCC does send NAL's. research the ARRl web page for history of incidential radiators good info when you ask the owner to change channels or bands the FCC mails NALs on that as well also monetary forfeitures can be assessed for failure to comply. mark h. Kevin Natalia wrote: Hi All, We have run into a problem with some local interference getting into one of our link radios. It is believed to be coming from one of the TV home transmitters, that one can buy from the local appliance shops. It is producing a signal right on teh input of our link. I have put an extra filter in line, but this did not fix it. I really do not want to do through the hassel of trying to get another set of freqencies at this stage. Shoudl add that when the RX is receiving a signal from the TX link, it overrides the interference nicely. The interference is just enough to open the squelch. Have thought about putting either CTCSS, or a newer DCS TX/RX boards in the link system. I have read somewhere that DCS is the better way to go. If this is the case, where is the best place to purchase boards to fit inside our radios. We are using Tait T345 and T346 gear. Any information will help point us in the right direction. Regards Kevin, ZL1KFM. Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] CTCSS or DCS
In Queensland we have to also track down the offending signal .All we use is a radio ,a beam ,and aunit that reduces the signal when you get closer and we have no problem finding signals and where they come from. Thank You, Ian Wells, Kerinvale Comaudio, www.kerinvalecomaudio.com.au ---Original Message--- From: Kevin Natalia Date: 11/23/05 14:44:32 To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] CTCSS or DCS Hi Guys, Thanks for the advise so far. I have just been up to the repeater site today, and have tightened up the squelch some so it does not open so easy. The offending signal is still there, and I can hear it on the input of my mobile radio. For information, here in New Zealand we have a Gov. Radio Frequency dept, however with the recent changes in how they now work, we (Hams) have to do 99% of the work, to track down the offender. Once we have the information, we can forward it to them to process. It can be easier to try and clean it up with CTCSS, change frequency, or remove completely(not an option). With the lack of equipment to track this down, will just have to see what happens, and just try and stop it from getting into our RX. The signal from the link TX, is strong enough to over-ride the interference, and give as a clean link. Good old FM capture effect. Regards Kevin, ZL1KFM. - Original Message - From: "Mark A. Holman" [EMAIL PROTECTED] To: Repeater-Builder@yahoogroups.com Sent: Wednesday, November 23, 2005 3:40 PM Subject: Re: [Repeater-Builder] CTCSS or DCS Say Kevin; If the interference is coming form a Part 15 device and IFon a licensed ham freq. it is called a incidental radiator, the FCC does send NAL's. research the ARRl web page for history of incidential radiators good info when you ask the owner to change channels or bands the FCC mails NALs on that as well also monetary forfeitures can be assessed for failure to comply. mark h. Kevin Natalia wrote: Hi All, We have run into a problem with some local interference getting into one of our link radios. It is believed to be coming from one of the TV home transmitters, that one can buy from the local appliance shops. It is producing a signal right on teh input of our link. I have put an extra filter in line, but this did not fix it. I really do not want to do through the hassel of trying to get another set of freqencies at this stage. Shoudl add that when the RX is receiving a signal from the TX link, it overrides the interference nicely. The interference is just enough to open the squelch. Have thought about putting either CTCSS, or a newer DCS TX/RX boards in the link system. I have read somewhere that DCS is the better way to go. If this is the case, where is the best place to purchase boards to fit inside our radios. We are using Tait T345 and T346 gear. Any information will help point us in the right direction. Regards Kevin, ZL1KFM. Yahoo! Groups Links Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/ YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] CTCSS or DCS
Kevin, I strongly recommend CTCSS over DCS. It's hard enough to tweak commercial-grade radios to have exactly the right digital waveform to reliably encode and decode DCS, but Amateur-grade transceivers are not nearly as reliable. Also, the DCS turn-off code is always a 134 Hz tone, regardless of what code you have selected, so any other stations on your frequency will mute your station at the same time, if they are also using digital coded squelch. This can be quite annoying! 73, Eric Lemmon WB6FLY Kevin Natalia wrote: Hi All, We have run into a problem with some local interference getting into one of our link radios. It is believed to be coming from one of the TV home transmitters, that one can buy from the local appliance shops. It is producing a signal right on the input of our link. I have put an extra filter in line, but this did not fix it. I really do not want to do through the hassle of trying to get another set of freqencies at this stage. I should add that, when the RX is receiving a signal from the TX link, it overrides the interference nicely. The interference is just enough to open the squelch. Have thought about putting either CTCSS, or a newer DCS TX/RX boards in the link system. I have read somewhere that DCS is the better way to go. If this is the case, where is the best place to purchase boards to fit inside our radios. We are using Tait T345 and T346 gear. Any information will help point us in the right direction. Regards Kevin, ZL1KFM. 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] Maxar 80
Hi all, Not repeater related directly, but have run across a few Maxar 80's in storage and wondering what they are. Know zilch about Moto model numbers, and figured this group would have someone that knows. Model: D04TSA3300BK The box has a label that they're UHF 4W. Also if anyone remembers (yeah, I know they're THAT old)... how to get the darn cover off them, any hints there would be appreciated also. Nate WY0X Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Looking for a UHF Circulator and load
Bob, Depending upon the frequency band and the modulation being used, it's possible that the cellular transmitter is radiating a low-level spurious signal. All cellular telephone sites transmit one or more control channels continuously, and the associated mobile units home on this channel to receive calls and adjust their power levels. You didn't state whether this cellular site was 800 MHz, 1800 MHz, or 1900 MHz, so let's assume that it is an 800 MHz cell site. Note that an 800 MHz cellular base station actually transmits in the 869-899 MHz band. Some brands of 800 MHz cellular base stations use a doubler just before the PA, which means that a low level signal in the 434-449 MHz range might be leaking out of the site, and could be continuously desensing your receiver even if it is not exactly on your input frequency. Even if the cell site is in a different band, it still uses doublers and triplers in various configurations to reach the channel frequencies. To determine if this scenario is valid, shut off your repeater and hook a spectrum analyzer to your antenna lead. Look for any more or less continuous carriers on or close to your repeater input frequency or to its image frequency. It's also possible that a technician left off some shields or didn't tighten all the screws on a cover plate during routine maintenance. 73, Eric Lemmon WB6FLY Bob M. wrote: Hi. A local UHF repeater is having massive desense problems. Everything is clean with a dummy load attached to the duplexer, so we know it's a problem with the connectors, coax, antenna, or jumper between the two. This is a two-month-old system at a cellphone site; nothing else there. The repeater is the only thing on 444.5 MHz. I'd like to try a circulator before buying one, since if it doesn't help the situation, it's a waste of money to have it there. I would agree however that its presence would be mandatory if this was a busy site, but for now it's just his repeater and all the cellphone equipment. He's running 200 watts out of a Henry amp, through a TxRx 4-section duplexer. We see a 20dB rise in the noise level at the Rx port when the transmitter comes on, with the system connected to the coax/antenna. Absolutely no change with a good dummy load attached to the duplexer's output. We even have desense with the 20 watts out of the exciter (power amp bypassed). The antenna is a super stationmaster cut for the 440-450 band. The coax is 7/8 and there's about 150 ft of it. So if someone has a circulator and reject load that would be rated for 200 watts to pass through it, please contact me. If there's a way we could try it, and buy it if it helps the situation, that would be ideal. Thanks. Bob M. __ Yahoo! FareChase: Search multiple travel sites in one click. http://farechase.yahoo.com Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Maxar 80
Hi Nate, You have what was called the 2 Watt LPI (low power-industrial) version of the UHF Maxar 80. The model number would indicate that it is a 2- freq radio with tone PL. The cover can be removed by disconnecting the mic connector on the side of the radio and removing the knobs (they pull off). Then you will need to pull down slightly on the bottom of the plastic case at the rear of the radio to disengage the two retainer tabs, and slide the chassis out of the case. These would probably make decent link TX radios. I don't like the Maxar series squelch circuit, so I would not use them as a repeater receiver. Good luck and 73, Kevin, K9HX At 12:21 AM 11/23/2005, you wrote: Hi all, Not repeater related directly, but have run across a few Maxar 80's in storage and wondering what they are. Know zilch about Moto model numbers, and figured this group would have someone that knows. Model: D04TSA3300BK The box has a label that they're UHF 4W. Also if anyone remembers (yeah, I know they're THAT old)... how to get the darn cover off them, any hints there would be appreciated also. Nate WY0X Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Maxar 80
At 09:21 PM 11/22/05, Nate Duehr [EMAIL PROTECTED] wrote: Hi all, Not repeater related directly, but have run across a few Maxar 80's in storage and wondering what they are. Know zilch about Moto model numbers, and figured this group would have someone that knows. Model: D04TSA3300BK The box has a label that they're UHF 4W. This web page may help: http://www.repeater-builder.com/motorola/motorola-suffixes.html You have the low power industrial series radio. It might do 8 or even 10w wide open but it was designed for 2-4w. Many LPI mobile radios will do continuous duty. Also if anyone remembers (yeah, I know they're THAT old)... how to get the darn cover off them, any hints there would be appreciated also. Dunnno on that series. Mike WA6ILQ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] New Repater Sytem Help!!!
I second this suggestion. I use Polyphaser arresters, and have been quite happy with them. Youll know when they take a hit. wink I also have some questions for the original poster, though. You mentioned that the antenna is about 27m up on top of the building. Did you mean 27 FEET? Afterward you asked about a rusty tripod I dont think they make them 27 METERS tall. grin Did you replace an older repeater? What brand did you settle on? Finally, why didnt the department budget to replace the infrastructure along with the repeater? Just curious. Mark N9WYS From: Repeater-Builder@yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com] On Behalf Of Andrew G. Sent: Tuesday, November 22, 2005 5:51 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] New Repater Sytem Help!!! Just so you don't have to spend more money on a new repeater after a few thunderstorms, a lightning arrestor is a must. A polyphaser is the arrestor of choice on our systems. The old feedline could be the problem as far as your coverage problems go. Some things to help determine what you problem might be are: Is there any desense between your TX and RX? What kind of antenna are you using? Terrain issue maybe? Also I would see about measuring the power out of the coax at the antenna end and do a quick calculation on what your losses are. For a VHF repeater, 1/2 Andrews Heliax is a pretty good choice for VHF for the $$. Andy Yahoo! FareChase - Search multiple travel sites in one click. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
