Re: [Repeater-Builder] Re: Help IDing a circulator
At 10/7/2009 16:39, you wrote: At 07:36 PM 10/6/2009, n...@no6b.com wrote: Are you sure you didn't miss a 3rd trimmer? Every tunable isolator I have has 3 adjustments per stage, one for each port. If not, it's possible the interstage tuning (1st stage output 2nd stage input) are fixed-tuned, which explains the narrow tunability. --Actually there are 4 trimmers (as my original post eluded to). Being a 2 stage isolator (4 ports total), there are two pass ones and 2 reject ones. There should have been 4 pass trimmers total. As I stated in my previous post, my guess is that the interstage tuning is fixed, which would explain the low bandwidth. Bob NO6B
Re: [Repeater-Builder] Question on portable repeaters
At 10/7/2009 16:15, you wrote: Morning, We are looking at building a portable repeater for special even use. This will be mobile mounted and 2M. My questions is this: If we are using two radios (one for TX one for RX) then what does the antenna separation have to be for all of this to work? Use a wide (2.5 MHz or greater) split a mobile duplexer. Then the antenna separation becomes 0. Bob NO6B
Re: [Repeater-Builder] Decibel VHF BP (only) Duplexer Cable Measurements? [1 Attachment]
Skipp Attached find a .pdf document that came with a DB 4080 duplexer I picked up second hand that was marked up by the DB factory showing the new cables needed and the loop sizes for a 2 meter mod to the standard range VHF duplexer. I have used these measurements for other DB duplexers in this same family that I have moved from the commercial VHF frequency rantes to 2 meters and they seem to work fine after changing to these cable lengths. Paul K0LAV peme...@comcast.net - Original Message - From: skipp025 skipp...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Friday, October 9, 2009 12:37:11 AM GMT -06:00 US/Canada Central Subject: [Repeater-Builder] Decibel VHF BP (only) Duplexer Cable Measurements? re: Decibel VHF Band Pass (only) 4 or 6 Cavity - Duplexer Cable Measurements? Has anyone here in the Group ever really measured the Decibel Products VHF Band-Pass (only) 4 or 6 Cavity Duplexer factory cable lengths at any frequency? I was looking at one in a rack today... the center T to each side looks quarter wave and the loops between bottles look at least half wave. Has anyone actually recorded the original Decibel Products factory constructed lengths for any VHF Frequency pairs? ... and would be willing to share that information? cheers, skipp ps: Even measurements for VHF Frequencies through 160 and 173 MHz would be handy to have.
Re: [Repeater-Builder] Re: Cleaning coax corrosion
Thanks to those that responded. I was able to cut the cable back a little way and use steel wool to clean the braid enough to take solder Thanks, John n3dab wrote: Since you have to diconnect it at the antenna end (the almost unreachable place ) and it is not for a repeater, why not just cut it back to where it is convenient to work on it (preferably indoors and weather protected) and provide a new piece of cable as a jumper to the antenna. If you cut the old cable back far enough from the exposed end you should be able to get to clean braid and center conductor, and insert ing a barrel connector wont degrade your signal enough to worry about. Doug N3DAB
Re: [Repeater-Builder] Question on portable repeaters
I applaud the desire to build a special event 2-meter portable repeater. I honestly think that most well-intentioned groups don't understand the technical difficulty to accomplish this task without spending a lot of money. However, it begs the question -- isn't there an existing, nearby 2-meter repeater that could be used? Chuck WB2EDV - Original Message - From: n...@no6b.com To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 8:48 AM Subject: Re: [Repeater-Builder] Question on portable repeaters At 10/7/2009 16:15, you wrote: Morning, We are looking at building a portable repeater for special even use. This will be mobile mounted and 2M. My questions is this: If we are using two radios (one for TX one for RX) then what does the antenna separation have to be for all of this to work? Use a wide (2.5 MHz or greater) split a mobile duplexer. Then the antenna separation becomes 0. Bob NO6B
Re: [Repeater-Builder] Re: Cleaning coax corrosion
John - I'll add to my previous response. The fact that the braid had discolored and tarnished is an indication that the integrity of the coax has been compromised. Water has migrated into it along with other contaminants. The result is that the coax is likely to exhibit reduced performance due to changes in it's electrical characteristics. While you may still get by, I'd suggest that you start planning on replacing the entire run at some point. I have no idea how critical the installation is, so that will dictate the urgency of your ultimate resolution. Maybe it's not that important and you can sustain a total failure at any given time. But if it does deteriorate further and become unusable, it will likely happen at the worst possible moment. At least that's my opinion. Chuck WB2EDV - Original Message - From: John johnk.mch...@att.net To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 9:08 AM Subject: Re: [Repeater-Builder] Re: Cleaning coax corrosion Thanks to those that responded. I was able to cut the cable back a little way and use steel wool to clean the braid enough to take solder Thanks, John n3dab wrote:
RE: [Repeater-Builder] Re: Cleaning coax corrosion
I expect shortly the inner will become softer and tacky white , the impedance will lump and the cable becomes an attenuator . cut it back and add a bit if you must but if the braid is tarnished you will have a continence of problems and quickly until you replace it with new or nearly so . Once replaced wrap the joint with a suitable sealing material / tape which can be found anywhere a cabler or telecomms persons buys stock ( and has been discussed at length) t do otherwise wll be frought with eventual failure , good luck with making a good repair . To: Repeater-Builder@yahoogroups.com From: wb2...@roadrunner.com Date: Fri, 9 Oct 2009 09:24:26 -0400 Subject: Re: [Repeater-Builder] Re: Cleaning coax corrosion John - I'll add to my previous response. The fact that the braid had discolored and tarnished is an indication that the integrity of the coax has been compromised. Water has migrated into it along with other contaminants. The result is that the coax is likely to exhibit reduced performance due to changes in it's electrical characteristics. While you may still get by, I'd suggest that you start planning on replacing the entire run at some point. I have no idea how critical the installation is, so that will dictate the urgency of your ultimate resolution. Maybe it's not that important and you can sustain a total failure at any given time. But if it does deteriorate further and become unusable, it will likely happen at the worst possible moment. At least that's my opinion. Chuck WB2EDV - Original Message - From: John johnk.mch...@att.net To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 9:08 AM Subject: Re: [Repeater-Builder] Re: Cleaning coax corrosion Thanks to those that responded. I was able to cut the cable back a little way and use steel wool to clean the braid enough to take solder Thanks, John n3dab wrote: _ Need a place to rent, buy or share? Let us find your next place for you! http://clk.atdmt.com/NMN/go/157631292/direct/01/
[Repeater-Builder] feeding two 120 degree sector antennas
I am experimenting with some 3 Ghz antennas. I have a 2 way power divider feeding two 120 degree sector antennas rated at 15 dBi each. I have a 11 dBi omni that I am comparing it too. It seems the omni is getting better performance then the array is. I am seeing more than a 4 dB difference, loss. My goal is to get more down tilt in my antenna pattern, as the sectors offer a mechanical down tilt. Am I doing something wrong? I am feeding the antennas with LMR400 and feed is short as possible. Each feed from the divider is 15 inches long to the antenna. The insertion loss in the divider is 0.4 dBi according to the spec sheet. Thanks in advance, Matthew
Re: [Repeater-Builder] feeding two 120 degree sector antennas
Are the two antennas pointed the same direction? If they are back to back, I'd guess that your results are what I'd expect. Chuck WB2EDV - Original Message - From: Matt kc7...@hotmail.com To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 2:29 PM Subject: [Repeater-Builder] feeding two 120 degree sector antennas I am experimenting with some 3 Ghz antennas. I have a 2 way power divider feeding two 120 degree sector antennas rated at 15 dBi each. I have a 11 dBi omni that I am comparing it too. It seems the omni is getting better performance then the array is. I am seeing more than a 4 dB difference, loss. My goal is to get more down tilt in my antenna pattern, as the sectors offer a mechanical down tilt. Am I doing something wrong? I am feeding the antennas with LMR400 and feed is short as possible. Each feed from the divider is 15 inches long to the antenna. The insertion loss in the divider is 0.4 dBi according to the spec sheet. Thanks in advance, Matthew Yahoo! Groups Links
[Repeater-Builder] Re: feeding two 120 degree sector antennas
Thanks for replying Chuck. The antennas are not perfectly back to back. More like 60 degrees from each other. I would have thought I'd have a null in one direction. Is there a better way to do this? I want close to the 11 dB gain my omni has, but with more down tilt. Thanks, 73 Matthew KC7EQO --- In Repeater-Builder@yahoogroups.com, Chuck Kelsey wb2...@... wrote: Are the two antennas pointed the same direction? If they are back to back, I'd guess that your results are what I'd expect. Chuck WB2EDV - Original Message - From: Matt kc7...@... To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 2:29 PM Subject: [Repeater-Builder] feeding two 120 degree sector antennas I am experimenting with some 3 Ghz antennas. I have a 2 way power divider feeding two 120 degree sector antennas rated at 15 dBi each. I have a 11 dBi omni that I am comparing it too. It seems the omni is getting better performance then the array is. I am seeing more than a 4 dB difference, loss. My goal is to get more down tilt in my antenna pattern, as the sectors offer a mechanical down tilt. Am I doing something wrong? I am feeding the antennas with LMR400 and feed is short as possible. Each feed from the divider is 15 inches long to the antenna. The insertion loss in the divider is 0.4 dBi according to the spec sheet. Thanks in advance, Matthew Yahoo! Groups Links
Re: [Repeater-Builder] FS (2) Micro Concepts RC 100 repeater controllers
I'll keep you in mind should I run across another tone panel. KC5DBH Matt From: Robert Boles bobe...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Tue, October 6, 2009 5:04:26 PM Subject: RE: [Repeater-Builder] FS (2) Micro Concepts RC 100 repeater controllers I will take the selectone Bob ki6rkq --- On Tue, 10/6/09, Chris Curtis demo...@rollanet.org wrote: From: Chris Curtis demo...@rollanet.org Subject: RE: [Repeater-Builder] FS (2) Micro Concepts RC 100 repeater controllers To: Repeater-Builder@yahoogroups.com Date: Tuesday, October 6, 2009, 2:47 PM I’d like the panel! Chris Kb0wlf From:Repeater-Builder@ yahoogroups. com [mailto:Repeater- buil...@yahoogro ups.com] On Behalf Of Matt Harker Sent: Tuesday, October 06, 2009 3:54 PM To: Repeater-Builder@ yahoogroups. com Subject: [Repeater-Builder] FS (2) Micro Concepts RC 100 repeater controllers I have 2 of the Micro Concepts RC 100 repeater controllers for sale if anyone is interested. Both work and I have all the documentation for them. $100 each + shipping. Also FS is a Selectone ST 180 shared repeater panel with 2 tones installed (CTCSS only); available for the cost of shipping to you. KC5DBH Matt No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.420 / Virus Database: 270.14.1/2407 - Release Date: 10/06/09 06:50:00 __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: [Repeater-Builder] Re: feeding two 120 degree sector antennas
Actually Jeff Depolo is much better versed to explain this than I am. Hopefully he can enter into this thread. I don't have an engineering background, and don't play an engineer on TV. I haven't even stayed at a Holiday Inn Express :-) Chuck WB2EDV - Original Message - From: Matt kc7...@hotmail.com To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 6:55 PM Subject: [Repeater-Builder] Re: feeding two 120 degree sector antennas Thanks for replying Chuck. The antennas are not perfectly back to back. More like 60 degrees from each other. I would have thought I'd have a null in one direction. Is there a better way to do this? I want close to the 11 dB gain my omni has, but with more down tilt. Thanks, 73 Matthew KC7EQO --- In Repeater-Builder@yahoogroups.com, Chuck Kelsey wb2...@... wrote: Are the two antennas pointed the same direction? If they are back to back, I'd guess that your results are what I'd expect. Chuck WB2EDV - Original Message - From: Matt kc7...@... To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 2:29 PM Subject: [Repeater-Builder] feeding two 120 degree sector antennas I am experimenting with some 3 Ghz antennas. I have a 2 way power divider feeding two 120 degree sector antennas rated at 15 dBi each. I have a 11 dBi omni that I am comparing it too. It seems the omni is getting better performance then the array is. I am seeing more than a 4 dB difference, loss. My goal is to get more down tilt in my antenna pattern, as the sectors offer a mechanical down tilt. Am I doing something wrong? I am feeding the antennas with LMR400 and feed is short as possible. Each feed from the divider is 15 inches long to the antenna. The insertion loss in the divider is 0.4 dBi according to the spec sheet. Thanks in advance, Matthew Yahoo! Groups Links Yahoo! Groups Links
[Repeater-Builder] FS Micro-Concepts RC100 repeater controller
I still have the two micro-concepts RC100 repeater controllers if anyone is interested. $100 each. The selectone device has sold. TNX de KC5DBH Matt
[Repeater-Builder] Re: feeding two 120 degree sector antennas
LOL thanks for your honesty. I am sure someone here can help with my questions. Oh BTW I have have not slept at a Holiday Inn Express either :) those are funny and creative commercials too. 73 Matthew KC7EQO --- In Repeater-Builder@yahoogroups.com, Chuck Kelsey wb2...@... wrote: Actually Jeff Depolo is much better versed to explain this than I am. Hopefully he can enter into this thread. I don't have an engineering background, and don't play an engineer on TV. I haven't even stayed at a Holiday Inn Express :-) Chuck WB2EDV - Original Message - From: Matt kc7...@... To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 6:55 PM Subject: [Repeater-Builder] Re: feeding two 120 degree sector antennas Thanks for replying Chuck. The antennas are not perfectly back to back. More like 60 degrees from each other. I would have thought I'd have a null in one direction. Is there a better way to do this? I want close to the 11 dB gain my omni has, but with more down tilt. Thanks, 73 Matthew KC7EQO --- In Repeater-Builder@yahoogroups.com, Chuck Kelsey wb2edv@ wrote: Are the two antennas pointed the same direction? If they are back to back, I'd guess that your results are what I'd expect. Chuck WB2EDV - Original Message - From: Matt kc7eqo@ To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 2:29 PM Subject: [Repeater-Builder] feeding two 120 degree sector antennas I am experimenting with some 3 Ghz antennas. I have a 2 way power divider feeding two 120 degree sector antennas rated at 15 dBi each. I have a 11 dBi omni that I am comparing it too. It seems the omni is getting better performance then the array is. I am seeing more than a 4 dB difference, loss. My goal is to get more down tilt in my antenna pattern, as the sectors offer a mechanical down tilt. Am I doing something wrong? I am feeding the antennas with LMR400 and feed is short as possible. Each feed from the divider is 15 inches long to the antenna. The insertion loss in the divider is 0.4 dBi according to the spec sheet. Thanks in advance, Matthew Yahoo! Groups Links Yahoo! Groups Links
RE: [Repeater-Builder] Re: feeding two 120 degree sector antennas
Have you considered a passive reflector ? it might offer the direction and tilt your looking for ( plus a couple of db) To: Repeater-Builder@yahoogroups.com From: kc7...@hotmail.com Date: Fri, 9 Oct 2009 22:55:18 + Subject: [Repeater-Builder] Re: feeding two 120 degree sector antennas Thanks for replying Chuck. The antennas are not perfectly back to back. More like 60 degrees from each other. I would have thought I'd have a null in one direction. Is there a better way to do this? I want close to the 11 dB gain my omni has, but with more down tilt. Thanks, 73 Matthew KC7EQO --- In Repeater-Builder@yahoogroups.com, Chuck Kelsey wb2...@... wrote: Are the two antennas pointed the same direction? If they are back to back, I'd guess that your results are what I'd expect. Chuck WB2EDV - Original Message - From: Matt kc7...@... To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 2:29 PM Subject: [Repeater-Builder] feeding two 120 degree sector antennas I am experimenting with some 3 Ghz antennas. I have a 2 way power divider feeding two 120 degree sector antennas rated at 15 dBi each. I have a 11 dBi omni that I am comparing it too. It seems the omni is getting better performance then the array is. I am seeing more than a 4 dB difference, loss. My goal is to get more down tilt in my antenna pattern, as the sectors offer a mechanical down tilt. Am I doing something wrong? I am feeding the antennas with LMR400 and feed is short as possible. Each feed from the divider is 15 inches long to the antenna. The insertion loss in the divider is 0.4 dBi according to the spec sheet. Thanks in advance, Matthew Yahoo! Groups Links _ Take a peek at other people's pay and perks Check out The Great Australian Pay Check http://clk.atdmt.com/NMN/go/157639755/direct/01/
[Repeater-Builder] Re: ARRL Approves Study Committee to Research Develop Plan for Narrowband Channel Spacing
--- In Repeater-Builder@yahoogroups.com, nj902 wb0...@... wrote: If you are referring to the 2.5 KHz steps - that's necessary so the radio can be programmed on whatever frequency is necessary due to the variety of band plans and channel spacings. That doesn't mean that in any one geography there is any intent to have adjacent channel operations 2.5KHz apart. - --- In Repeater-Builder@yahoogroups.com, afa5tp w7trh@ wrote: Hello Group, I may be confusedso please set me straight. I thought that the new Narrow Band was the narrowing the channel spacing from 25kHz. to 12.5kHz, and of course, knocking down the deviation from 5 kHz. to 2.5 kHz. On the subject of affordable Narrow Band gearI highly recommend the Icom F-121 (VHF), or F-221 (UHF). These radios feature PC programming, and are wide/narrow band selectable per channel. Price is about $275.00 for the eight channel version. There is a 128 ch. version available for more ! I guess I am Waiting in the Wings, like everyone else.! TIM W7TRH/AFA0TP Wa. --- In Repeater-Builder@yahoogroups.com, wd8chl wd8chl@ wrote: James Delancy wrote: Glad to see my posts are making it. In the commercial and public safety world (Motorola style primarily as I am not entirely up on all the others except to find that the Kenwood, Icoms and Vertex stuff was slow to adopt 2.5 KHz steps), if it accepts 2.5 Khz steps, then you can select narrowband and it will narrow up its IF's for receive, boost the audio on RX and narrow down the transmit accordingly. All of the ham stuff that I have now will do narrowband, but most will NOT do a 2.5 KHz step. Does that help clarify it ;) James WJ1D Again, as of about 13 years ago or so, the FCC mandated that narrowband modes be included in radios for Part 90. The 2.5 KHz steps issue is not related at all. Hi everybody... Don't check it now, but we already are at plus and minus 2.5 kc deviation!!! IF they do that to channel frequncy spsacing, AS LONG AS EVERYBODY IS THE SAME it will work.. When the Feds created National Telecommunications Industry Administration to be another FCC to govern other people, it created 2,500 KC Deviation in place of 3,500 to keep everything within limits, with a pl deviation of 250 cps in place of 300 cps! My wife bought a 2 meter radio in about 2001 and I checked it with my Service Monitor, after some discusssuion and it tested out at 250 deviation PL and 2,500 voice!! All the radios are that way now, and nobody has noticed it!!! The ham manufactures did that to keep the compatableity with NTIA specs and nobody has noticed!! As to 2,500 Khz channel seperation of operating frequencies, it has worked well as it did at 25 kc deviation frequencies, and still works at AS LONG AS EVERYBODY IS THE SAME!!! Some radios may haver to change I.F. filters, but that is in manufacturing... IF we were all Digital, I'm retired Western Union Tech that went to work in Mobile Rsadio Communications when W.U. went out of busibess. Frequeny shift multiplxed audio data could run well at 70 cps frequency shift, and at a negatinve 40 db, but voice is NOT that compatable, and voice had to run at 300 - 3500 cps, and for voice reconigation, higher levels as it was just noise at the same minus 40 db!!! The two are NOT compatable!!! Dick, W7TIO, CET
[Repeater-Builder] help icom f121s
need help i have icom f121s for repeater use i have every thing setup use cat controller but i turn on the rx exo to on and turn off the delay timer off but when i check the horn cable i does not do nothing stays to ground no changes of voltage as cor or cos can any one help me please.
RE: [Repeater-Builder] Re: feeding two 120 degree sector antennas
How about some indication of what you hope to achieve I use a skelol slot I made on .70cm with great success and have used a refletor with good gain on a vertical in the past for a null B fyi http://www.patentstorm.us/patents/5477224/claims.html To: Repeater-Builder@yahoogroups.com From: kc7...@hotmail.com Date: Fri, 9 Oct 2009 23:25:31 + Subject: [Repeater-Builder] Re: feeding two 120 degree sector antennas LOL thanks for your honesty. I am sure someone here can help with my questions. Oh BTW I have have not slept at a Holiday Inn Express either :) those are funny and creative commercials too. 73 Matthew KC7EQO --- In Repeater-Builder@yahoogroups.com, Chuck Kelsey wb2...@... wrote: Actually Jeff Depolo is much better versed to explain this than I am. Hopefully he can enter into this thread. I don't have an engineering background, and don't play an engineer on TV. I haven't even stayed at a Holiday Inn Express :-) Chuck WB2EDV - Original Message - From: Matt kc7...@... To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 6:55 PM Subject: [Repeater-Builder] Re: feeding two 120 degree sector antennas Thanks for replying Chuck. The antennas are not perfectly back to back. More like 60 degrees from each other. I would have thought I'd have a null in one direction. Is there a better way to do this? I want close to the 11 dB gain my omni has, but with more down tilt. Thanks, 73 Matthew KC7EQO --- In Repeater-Builder@yahoogroups.com, Chuck Kelsey wb2edv@ wrote: Are the two antennas pointed the same direction? If they are back to back, I'd guess that your results are what I'd expect. Chuck WB2EDV - Original Message - From: Matt kc7eqo@ To: Repeater-Builder@yahoogroups.com Sent: Friday, October 09, 2009 2:29 PM Subject: [Repeater-Builder] feeding two 120 degree sector antennas I am experimenting with some 3 Ghz antennas. I have a 2 way power divider feeding two 120 degree sector antennas rated at 15 dBi each. I have a 11 dBi omni that I am comparing it too. It seems the omni is getting better performance then the array is. I am seeing more than a 4 dB difference, loss. My goal is to get more down tilt in my antenna pattern, as the sectors offer a mechanical down tilt. Am I doing something wrong? I am feeding the antennas with LMR400 and feed is short as possible. Each feed from the divider is 15 inches long to the antenna. The insertion loss in the divider is 0.4 dBi according to the spec sheet. Thanks in advance, Matthew Yahoo! Groups Links Yahoo! Groups Links _ Take a peek at other people's pay and perks Check out The Great Australian Pay Check http://clk.atdmt.com/NMN/go/157639755/direct/01/
