[Repeater-Builder] Re: stitching schematics together
I've done this by a very tedious method. Scan the 8-1/2X11 sections to BMP files, then in MS PAint create a new image the correct size and paste each section in, using mouse control to line up edges of adjacent bmp's, then print to a pdf. Its important to get the initial image size correct in Paint. Add up all the widths from the bmp's and take the largest height as the initial size. You can always crop down later. Eric's idea is best. Not very costly. And I have a couple of manuals Eric copied this way, and the output runs rings around the stitching method. GeorgeC W2DB --- In Repeater-Builder@yahoogroups.com, R.K. Brumback brumb...@... wrote: Thanks Eric! I will probably do that with my very large pages as you say. In another group someone mentioned that Adobe Photoshop will stitch together pdfs so I may try that with some of the 11 x 17s. I wasn't aware Photoshop would do graphics like that. Thanks again for your reply. Randy B. From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Eric Lemmon Sent: Tuesday, September 01, 2009 8:38 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Randy, Rather than scan large schematics piecemeal, simply take the sheets to a commercial graphics shop (some Kinko's may have the 11 by 17 equipment) and have them scan the document in one piece. My local graphics shop can handle huge schematics, so I take all Motorola and GE fold-out sheets (which are up to 34 inches wide) and have them scanned directly to PDF and put on a CD or thumb drive. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ] On Behalf Of R.K. Brumback Sent: Tuesday, September 01, 2009 3:24 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com ; manual_excha...@yahoogroups.com mailto:Manual_Exchange%40yahoogroups.com Subject: [Repeater-Builder] Does anyone know or use a program where I can scan large schematics a little at a time and then connect them back in a file like a pdf file? I can't afford a large bed scanner but I have several 11x17s I would like to scan on my 8 ½ x 11 scanner. Randy
Re: [Repeater-Builder] Narrow Banding and VHF Low Band
Does anyone know if a MSF5000 converted to narrowband operation would be legal under Part 90 after 2013? Tony Gary wrote: Don't know where you got the below 512Mhz comment from (except perhaps a sloppy comment in a recent article printed in Urgent Communications) but here's what the R O really says; Earlier in this proceeding, the Commission took the following actions in order to bring about a timely transition to narrowband technology: (1) set January 1, 2013, as the deadline for Industrial/Business and Public Safety Radio Pool licensees in the 150-174 MHz and 421-512 MHz bands to either migrate to 12.5 kHz technology, or utilize a technology that achieves equivalent efficiency; (2) prohibited any applications for new systems using 25 kHz channels, or modification applications that expand the authorized contour of an existing 25 kHz station, effective January 1, 2011; (3) prohibited the manufacture and importation of any 150-174 MHz or 421-512 MHz band equipment capable of operating with only one voice path per 25 kHz of spectrum, i.e., equipment that includes a 25 kHz mode, beginning January 1, 2011; and (4) prohibited the certification of any equipment that includes a 25 kHz mode beginning January 1, 2011.2 Keep in mind this applies to Part 90 services and not Part 95 or 97 radio services. Gary -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com] On Behalf Of wmhpowell Sent: Monday, August 31, 2009 9:49 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Narrow Banding and VHF Low Band Help! The FCC rules on narrow-banding seem to be contradictory when it comes to determining if VHF low band must be converted to narrow band. On one hand, the FCC states that All below 512 MHz which implies VHF low but on the other they specifically mention VHF high and UHF, specifically NOT mentioning VHF low band. I need to come up with a specific reference from FCC docs either requiring or exempting VHF low from narrow banding requirements. Urban legend and I heard won't get the funding if VHF low must be narrow-banded - only something form the FCC can make the $$ flow. And, yes, I looked but found nothing definitive. Thanks, Bill - WB1GOT Yahoo! Groups Links
Re: [Repeater-Builder] Antenna SWR = Desense?
One of the local repeater operators used an antenna at the top of a 100 ft tower that got bent over during last winter storms. He put up a temporary antenna at the tower base and is experiencing some really bad desense with the low antenna. He is using a GE Mastr II base station repeater and had reasonable operation with little desense on the antenna 100 ft above the equipment. The antenna only 15 ft or so above the equipment now and has the bad desense problem. It would appear that the antenna is flooding the equipment with more RF than the shielding can handle. BTW, take a look at some of the previous posts on modifying a DB-224 by adding a 2 inch extension to each end of each dipole to bring it down into the ham band. The SWR does not go completely to 1:1, but does hit a minimum in the middle of the 2 meter ham band. No change to the harness was required to move the antenna frequency. 73 - Jim W5ZIT --- On Tue, 9/1/09, tahrens301 tahr...@swtexas.net wrote: From: tahrens301 tahr...@swtexas.net Subject: [Repeater-Builder] Antenna SWR = Desense? To: Repeater-Builder@yahoogroups.com Date: Tuesday, September 1, 2009, 2:03 PM Hi folks, Just a bit of an update... got the 6 cavity Telewave duplexer tweaked up - looks like it pretty much hit the specs in the data sheet. With a dummy load at the 'antenna' port, I used an iso-tee to inject a signal at both the receiver input, and between the antenna port the dummy load. With a weak signal, both places showed me that there was no desense. Very weak signal would hold in the repeater. However, putting the system on the antenna (a 150-160 mhz DB-224 100' horizontally 10' vertically separated) through a metal building fed with 7/8 heliax, there seems to be no end to the desense! The wattmeter shows 30 watts forward 3 watts reflected at the antenna port, if my math serves, it's less than 2:1. Can the less than 1:1 match be the culprit? Thanks, Tim W5FN __
[Repeater-Builder] Re: Antenna SWR = Desense?
Hi Jim All, Thanks for the info responses. I took down the 224 found that the N connector on the end wasn't quite up to snuff. I am going to put a ham antenna on it - think it's a ringo2 or some such thing, just to see how an antenna with good swr will work in the desense arena. Then I'll put up a different 224 see how it goes. I did see the posting about how to lower the frequency of a 224. Not sure I want to go that route, but might in the end! I built a small matching unit that I'll try out... basically a tuner that will go between the duplexer feedline. One of the guys talked about using a smith chart putting some stubs at the feed line which would change the matching. gee, lots of things to experiment with. That's the fun of it no? :-o Thanks again, I'll post my progress. Tim W5FN --- In Repeater-Builder@yahoogroups.com, Jim Brown w5...@... wrote: One of the local repeater operators used an antenna at the top of a 100 ft tower that got bent over during last winter storms. He put up a temporary antenna at the tower base and is experiencing some really bad desense with the low antenna. He is using a GE Mastr II base station repeater and had reasonable operation with little desense on the antenna 100 ft above the equipment. The antenna only 15 ft or so above the equipment now and has the bad desense problem. It would appear that the antenna is flooding the equipment with more RF than the shielding can handle. BTW, take a look at some of the previous posts on modifying a DB-224 by adding a 2 inch extension to each end of each dipole to bring it down into the ham band. The SWR does not go completely to 1:1, but does hit a minimum in the middle of the 2 meter ham band. No change to the harness was required to move the antenna frequency. 73 - Jim W5ZIT --- On Tue, 9/1/09, tahrens301 tahr...@... wrote: From: tahrens301 tahr...@... Subject: [Repeater-Builder] Antenna SWR = Desense? To: Repeater-Builder@yahoogroups.com Date: Tuesday, September 1, 2009, 2:03 PM Hi folks, Just a bit of an update... got the 6 cavity Telewave duplexer tweaked up - looks like it pretty much hit the specs in the data sheet. With a dummy load at the 'antenna' port, I used an iso-tee to inject a signal at both the receiver input, and between the antenna port the dummy load. With a weak signal, both places showed me that there was no desense. Very weak signal would hold in the repeater. However, putting the system on the antenna (a 150-160 mhz DB-224 100' horizontally 10' vertically separated) through a metal building fed with 7/8 heliax, there seems to be no end to the desense! The wattmeter shows 30 watts forward 3 watts reflected at the antenna port, if my math serves, it's less than 2:1. Can the less than 1:1 match be the culprit? Thanks, Tim W5FN __
[Repeater-Builder] FS: Scom 7K, NHRC DADM
For Sale: Scom 7K repeater controller LED front panel Speech Synthesizer Module NO patch module, NO dadm installed. Latest firmware V2.03B Manual on CD. Unit has the normal scratches from being installed in a repeater rack, but not abused. No mods or repairs to the boards, and it works perfectly. Pics available to interested parties. $425 shipped ground NHRC DADM digital audio delay module. $60 shipped usps. Eric KE2D 609-713-3742
[Repeater-Builder] FS: LDG RVS-8 voter
For sale: LDG RVS-8 voter. Unit in working condition. A little dusty from years at a site. The only minor issue is that the top cover is missing. $220 shipped. Eric KE2D 609-713-3742
[Repeater-Builder] Re: Antenna SWR = Desense?
Hi All, And the winner is. Door # 2. Put the 2 meter vertical up on the stick at the end of the hard line, the desense was worse! Perfect match at the feed line end. Took dummy load put on far end of hard line no desense. Guess it is the proximity to the antenna. Although about 100', guess the RF is getting back into the box. Gonna set the antenna party for Friday morning. The stuff is going up on the tower (unless somebody can see some flaw in my logic can suggest another test)! Thanks again to all! Tim W5FN
Re: [Repeater-Builder] Re: Antenna SWR = Desense?
look at all your repeater sheilding and interconnect cables from repeater dto duplexer and those cables. you appear to be getting signal ingress through the recieve side somehow. I have had antenna on top of the repeater using a mag mount and not had problems. Good luck this is a tough problem to resolve. Stan --- On Wed, 9/2/09, tahrens301 tahr...@swtexas.net wrote: From: tahrens301 tahr...@swtexas.net Subject: [Repeater-Builder] Re: Antenna SWR = Desense? To: Repeater-Builder@yahoogroups.com Date: Wednesday, September 2, 2009, 11:56 AM Hi All, And the winner is. Door # 2. Put the 2 meter vertical up on the stick at the end of the hard line, the desense was worse! Perfect match at the feed line end. Took dummy load put on far end of hard line no desense. Guess it is the proximity to the antenna. Although about 100', guess the RF is getting back into the box. Gonna set the antenna party for Friday morning. The stuff is going up on the tower (unless somebody can see some flaw in my logic can suggest another test)! Thanks again to all! Tim W5FN
[Repeater-Builder] Re: Narrow Banding and VHF Low Band
In the real world... it's only the responsibility of the License holder to ensure the transmitter emissions are legal and based on my conversations with a few FCC types means they are within the normal legal parameters/operation/scope of the license They have much bigger fish to fry... cheers, s. Tony KT9AC kt...@... wrote: Does anyone know if a MSF5000 converted to narrowband operation would be legal under Part 90 after 2013? Tony Gary wrote: Don't know where you got the below 512Mhz comment from (except perhaps a sloppy comment in a recent article printed in Urgent Communications) but here's what the R O really says; Earlier in this proceeding, the Commission took the following actions in order to bring about a timely transition to narrowband technology: (1) set January 1, 2013, as the deadline for Industrial/Business and Public Safety Radio Pool licensees in the 150-174 MHz and 421-512 MHz bands to either migrate to 12.5 kHz technology, or utilize a technology that achieves equivalent efficiency; (2) prohibited any applications for new systems using 25 kHz channels, or modification applications that expand the authorized contour of an existing 25 kHz station, effective January 1, 2011; (3) prohibited the manufacture and importation of any 150-174 MHz or 421-512 MHz band equipment capable of operating with only one voice path per 25 kHz of spectrum, i.e., equipment that includes a 25 kHz mode, beginning January 1, 2011; and (4) prohibited the certification of any equipment that includes a 25 kHz mode beginning January 1, 2011.2 Keep in mind this applies to Part 90 services and not Part 95 or 97 radio services. Gary -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com] On Behalf Of wmhpowell Sent: Monday, August 31, 2009 9:49 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: [Repeater-Builder] Narrow Banding and VHF Low Band Help! The FCC rules on narrow-banding seem to be contradictory when it comes to determining if VHF low band must be converted to narrow band. On one hand, the FCC states that All below 512 MHz which implies VHF low but on the other they specifically mention VHF high and UHF, specifically NOT mentioning VHF low band. I need to come up with a specific reference from FCC docs either requiring or exempting VHF low from narrow banding requirements. Urban legend and I heard won't get the funding if VHF low must be narrow-banded - only something form the FCC can make the $$ flow. And, yes, I looked but found nothing definitive. Thanks, Bill - WB1GOT Yahoo! Groups Links
Re: [Repeater-Builder]
Eric Lemmon wrote: Randy, Rather than scan large schematics piecemeal, simply take the sheets to a commercial graphics shop (some Kinko's may have the 11 by 17 equipment) and have them scan the document in one piece. My local graphics shop can handle huge schematics, so I take all Motorola and GE fold-out sheets (which are up to 34 inches wide) and have them scanned directly to PDF and put on a CD or thumb drive. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com] On Behalf Of R.K. Brumback Sent: Tuesday, September 01, 2009 3:24 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com; manual_excha...@yahoogroups.com mailto:Manual_Exchange%40yahoogroups.com Subject: [Repeater-Builder] Does anyone know or use a program where I can scan large schematics a little at a time and then connect them back in a file like a pdf file? I can’t afford a large bed scanner but I have several 11x17s I would like to scan on my 8 ½ x 11 scanner. Randy I find the easiest way to make copies larger than a scanner can handle is to use a camera. Just mount it on the wall with reasonable amount of light and make sure you are square to the wall. Then using a lower ISO like 50 or 100, make several exposures and just pick the best one. If you have the images scanned in you can download a panorama stiching program to put them together. Herm K2AVA Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: mailto:repeater-builder-dig...@yahoogroups.com mailto:repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Repeater trouble
Hi all, We have a puzzling problem with our two 2m repeater networks. They all use Mitrek's on 2m and Maxtrac's on UHF for linking; each network has a handful of satellite repeaters, all on diff. 2m freqs of course. All satellites use one of two UHF freqs for simplex linking to their hub repeaters. All it takes to swing a satellite repeater from one network to another is to change the UHF link freq. With the Maxtrac's, that's easy (or should be!). In one instance, we've struggled greatly to do this successfully. After reprogramming the Maxtrac at the repeater site, the UHF linking signal sounds fine on HT's, dual band transceivers a consumer-grade scanner _at the remote site_. But from the hub repeater, the VHF output signal, coming in from this newly-linked repeater ONLY, sounds garbly, like AC ripple or overdriven PL tone (we don't use PL). At the linked repeater site, we've changed antennas, power supplies link Maxtrac with no improvement. As our repeater sites are rather remote (in the middle of nowhere, hours driving away from one another, and/or up mountain peaks), we've not had a chance to listen to it at the hub site. So we don't know if the UHF signal is arriving there ok or not, or whether the VHF output signal is somehow being corrupted. The puzzling thing is that A) the newly linked repeater worked perfectly with the 2nd network and B) all satellite repeaters use the same UHF link freq they all work FB. I wonder what we're missing (duh!)? Any thoughts? Thanks! --John WB0EQ/VE6
Re: [Repeater-Builder]
No Picture. Just a bunch of Mumbo Jumble - Original Message - From: Herman Niedzielski k2...@myactv.net To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 2:33 PM Subject: Re: [Repeater-Builder] Eric Lemmon wrote: Randy, Rather than scan large schematics piecemeal, simply take the sheets to a commercial graphics shop (some Kinko's may have the 11 by 17 equipment) and have them scan the document in one piece. My local graphics shop can handle huge schematics, so I take all Motorola and GE fold-out sheets (which are up to 34 inches wide) and have them scanned directly to PDF and put on a CD or thumb drive. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com] On Behalf Of R.K. Brumback Sent: Tuesday, September 01, 2009 3:24 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com; manual_excha...@yahoogroups.com mailto:Manual_Exchange%40yahoogroups.com Subject: [Repeater-Builder] Does anyone know or use a program where I can scan large schematics a little at a time and then connect them back in a file like a pdf file? I can’t afford a large bed scanner but I have several 11x17s I would like to scan on my 8 ½ x 11 scanner. Randy I find the easiest way to make copies larger than a scanner can handle is to use a camera. Just mount it on the wall with reasonable amount of light and make sure you are square to the wall. Then using a lower ISO like 50 or 100, make several exposures and just pick the best one. If you have the images scanned in you can download a panorama stiching program to put them together. Herm K2AVA Yahoo! Groups Links Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: mailto:repeater-builder-dig...@yahoogroups.com mailto:repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder]
Sorry about that Did not mean to send it to you - Original Message - From: Wesley Bazell wesley...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 2:37 PM Subject: Re: [Repeater-Builder] No Picture. Just a bunch of Mumbo Jumble - Original Message - From: Herman Niedzielski k2...@myactv.net To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 2:33 PM Subject: Re: [Repeater-Builder] Eric Lemmon wrote: Randy, Rather than scan large schematics piecemeal, simply take the sheets to a commercial graphics shop (some Kinko's may have the 11 by 17 equipment) and have them scan the document in one piece. My local graphics shop can handle huge schematics, so I take all Motorola and GE fold-out sheets (which are up to 34 inches wide) and have them scanned directly to PDF and put on a CD or thumb drive. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com] On Behalf Of R.K. Brumback Sent: Tuesday, September 01, 2009 3:24 PM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com; manual_excha...@yahoogroups.com mailto:Manual_Exchange%40yahoogroups.com Subject: [Repeater-Builder] Does anyone know or use a program where I can scan large schematics a little at a time and then connect them back in a file like a pdf file? I can’t afford a large bed scanner but I have several 11x17s I would like to scan on my 8 ½ x 11 scanner. Randy I find the easiest way to make copies larger than a scanner can handle is to use a camera. Just mount it on the wall with reasonable amount of light and make sure you are square to the wall. Then using a lower ISO like 50 or 100, make several exposures and just pick the best one. If you have the images scanned in you can download a panorama stiching program to put them together. Herm K2AVA 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/ * Your email settings: Individual Email | Traditional * To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) * To change settings via email: mailto:repeater-builder-dig...@yahoogroups.com mailto:repeater-builder-fullfeatu...@yahoogroups.com * To unsubscribe from this group, send an email to: repeater-builder-unsubscr...@yahoogroups.com * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Text missing
Hi guys .I was wondering in my last posts some of my text was missing when I received the email . Is it a fault this end or is in the settings of the yahoo group Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Repeater trouble
I heard a similar problem with an ARES net in Oregon. One of the county EOC's had installed a high rooftop antenna for the hams, and could be worked on simplex for many miles, but into the main ARES 2m repeater it sounded as you described, to the point it was unintelligible. It was fine into other repeaters, and the same operator could switch to a simple J-pole or ground plane on a balcony railing and be perfect into the ARES repeater. My best guess is the antenna, which was on a rooftop bristling with other antennas, was in some unfortunate spacial relationship to other conductors to produce a really disruptive multipath signal on the specific compass heading of the repeater used for the ARES net. The good news: the fix would be simple. The bad news: it would also be a major PITA. You may have to go to that remote site and move something 4 inches to get it to work. 73, Paul, AE4KR - Original Message - From: John Sehring To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 12:35 PM Subject: [Repeater-Builder] Repeater trouble Hi all, We have a puzzling problem with our two 2m repeater networks. They all use Mitrek's on 2m and Maxtrac's on UHF for linking; each network has a handful of satellite repeaters, all on diff. 2m freqs of course. All satellites use one of two UHF freqs for simplex linking to their hub repeaters. All it takes to swing a satellite repeater from one network to another is to change the UHF link freq. With the Maxtrac's, that's easy (or should be!). In one instance, we've struggled greatly to do this successfully. After reprogramming the Maxtrac at the repeater site, the UHF linking signal sounds fine on HT's, dual band transceivers a consumer-grade scanner _at the remote site_. But from the hub repeater, the VHF output signal, coming in from this newly-linked repeater ONLY, sounds garbly, like AC ripple or overdriven PL tone (we don't use PL). At the linked repeater site, we've changed antennas, power supplies link Maxtrac with no improvement. As our repeater sites are rather remote (in the middle of nowhere, hours driving away from one another, and/or up mountain peaks), we've not had a chance to listen to it at the hub site. So we don't know if the UHF signal is arriving there ok or not, or whether the VHF output signal is somehow being corrupted. The puzzling thing is that A) the newly linked repeater worked perfectly with the 2nd network and B) all satellite repeaters use the same UHF link freq they all work FB. I wonder what we're missing (duh!)? Any thoughts? Thanks! --John WB0EQ/VE6
[Repeater-Builder] Wacom WP-652/WP-653: different year, different specs
I dug up an old spec. sheet for the above 220 MHz duplexer in the shack today. Wondering if this sheet was available on the web somewhere (so I could throw it away - cleaning up), I did find it on Repeater-Builder at http://www.repeater-builder.com/wacom/wp652.pdf However, there are some distinct differences between the two data sheets, the PDF sheet having a date of 3/97 my old sheet of 9/85: old sheet: 220-300 MHz, 1.0 MHz min. spacing, 350 watts max. new sheet: 210-260 MHz, 1.0 MHz min. spacing, 200 watts max. The frequency response charts look identical, as do the loss isolation specs. The old sheet lists the finish as gray enamel, while the new ones are black enamel. Guess they really don't make them like they used to. Bob NO6B P.S.: I'm hanging on to the old sheet; when I get some time I'll scan it send it in to Mike for posting to the R.B. page.
Re: [Repeater-Builder] Re: Antenna SWR = Desense?
Tim Been there and done that! My guess is that you have corrosion in the antenna on top. The corrosion makes a good wide band rectifier of your transmit power and produces sufficient noise at your receive frequency to get back through your duplexer and into your receiver as desense. Actually, come to think about it, the end result of the situation is simular to bad LMR-400. Scott, N6NXI - Original Message - From: tahrens301 To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 9:56 AM Subject: [Repeater-Builder] Re: Antenna SWR = Desense? Hi All, And the winner is. Door # 2. Put the 2 meter vertical up on the stick at the end of the hard line, the desense was worse! Perfect match at the feed line end. Took dummy load put on far end of hard line no desense. Guess it is the proximity to the antenna. Although about 100', guess the RF is getting back into the box. Gonna set the antenna party for Friday morning. The stuff is going up on the tower (unless somebody can see some flaw in my logic can suggest another test)! Thanks again to all! Tim W5FN -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.75/2340 - Release Date: 09/01/09 20:03:00
[Repeater-Builder] Re: Antenna SWR = Desense?
You mentioned 100 ft hoz separation, I don't think that is enough, but don't have a chart handy where I am now. Sid. --- In Repeater-Builder@yahoogroups.com, tahrens301 tahr...@... wrote: Hi Jim All, Thanks for the info responses. I took down the 224 found that the N connector on the end wasn't quite up to snuff. I am going to put a ham antenna on it - think it's a ringo2 or some such thing, just to see how an antenna with good swr will work in the desense arena. Then I'll put up a different 224 see how it goes. I did see the posting about how to lower the frequency of a 224. Not sure I want to go that route, but might in the end! I built a small matching unit that I'll try out... basically a tuner that will go between the duplexer feedline. One of the guys talked about using a smith chart putting some stubs at the feed line which would change the matching. gee, lots of things to experiment with. That's the fun of it no? :-o Thanks again, I'll post my progress. Tim W5FN --- In Repeater-Builder@yahoogroups.com, Jim Brown w5zit@ wrote: One of the local repeater operators used an antenna at the top of a 100 ft tower that got bent over during last winter storms. He put up a temporary antenna at the tower base and is experiencing some really bad desense with the low antenna. He is using a GE Mastr II base station repeater and had reasonable operation with little desense on the antenna 100 ft above the equipment. The antenna only 15 ft or so above the equipment now and has the bad desense problem. It would appear that the antenna is flooding the equipment with more RF than the shielding can handle. BTW, take a look at some of the previous posts on modifying a DB-224 by adding a 2 inch extension to each end of each dipole to bring it down into the ham band. The SWR does not go completely to 1:1, but does hit a minimum in the middle of the 2 meter ham band. No change to the harness was required to move the antenna frequency. 73 - Jim W5ZIT --- On Tue, 9/1/09, tahrens301 tahrens@ wrote: From: tahrens301 tahrens@ Subject: [Repeater-Builder] Antenna SWR = Desense? To: Repeater-Builder@yahoogroups.com Date: Tuesday, September 1, 2009, 2:03 PM Hi folks, Just a bit of an update... got the 6 cavity Telewave duplexer tweaked up - looks like it pretty much hit the specs in the data sheet. With a dummy load at the 'antenna' port, I used an iso-tee to inject a signal at both the receiver input, and between the antenna port the dummy load. With a weak signal, both places showed me that there was no desense. Very weak signal would hold in the repeater. However, putting the system on the antenna (a 150-160 mhz DB-224 100' horizontally 10' vertically separated) through a metal building fed with 7/8 heliax, there seems to be no end to the desense! The wattmeter shows 30 watts forward 3 watts reflected at the antenna port, if my math serves, it's less than 2:1. Can the less than 1:1 match be the culprit? Thanks, Tim W5FN __
[Repeater-Builder] Re: Antenna SWR = Desense?
Thanks to all... I guess it could be corrosion at the antenna, but the one that is on it now is pretty simple, not much opportunity for corrosion. I am going to put up the 2nd DB-224 tomorrow see what difference it makes... I don't really think it'll change much, but it will let me play with the matching unit I built see if it works! Don - I can put the iso-tee in line, feed the atten port into the spectrum analyzer. It should show me if the xmtr is having problems. However, the current antenna is a perfect match - no reflected power at all, so I think the xmtr 'should' be happy. The 100' may be the real problem, although everything has very well made cables, quality RG-214, N connectors, etc. Thanks, Tim W5FN --- In Repeater-Builder@yahoogroups.com, purvissid purvis...@... wrote: You mentioned 100 ft hoz separation, I don't think that is enough, but don't have a chart handy where I am now. Sid. --- In Repeater-Builder@yahoogroups.com, tahrens301 tahrens@ wrote: Hi Jim All, Thanks for the info responses. I took down the 224 found that the N connector on the end wasn't quite up to snuff. I am going to put a ham antenna on it - think it's a ringo2 or some such thing, just to see how an antenna with good swr will work in the desense arena. Then I'll put up a different 224 see how it goes. I did see the posting about how to lower the frequency of a 224. Not sure I want to go that route, but might in the end! I built a small matching unit that I'll try out... basically a tuner that will go between the duplexer feedline. One of the guys talked about using a smith chart putting some stubs at the feed line which would change the matching. gee, lots of things to experiment with. That's the fun of it no? :-o Thanks again, I'll post my progress. Tim W5FN --- In Repeater-Builder@yahoogroups.com, Jim Brown w5zit@ wrote: One of the local repeater operators used an antenna at the top of a 100 ft tower that got bent over during last winter storms. He put up a temporary antenna at the tower base and is experiencing some really bad desense with the low antenna. He is using a GE Mastr II base station repeater and had reasonable operation with little desense on the antenna 100 ft above the equipment. The antenna only 15 ft or so above the equipment now and has the bad desense problem. It would appear that the antenna is flooding the equipment with more RF than the shielding can handle. BTW, take a look at some of the previous posts on modifying a DB-224 by adding a 2 inch extension to each end of each dipole to bring it down into the ham band. The SWR does not go completely to 1:1, but does hit a minimum in the middle of the 2 meter ham band. No change to the harness was required to move the antenna frequency. 73 - Jim W5ZIT --- On Tue, 9/1/09, tahrens301 tahrens@ wrote: From: tahrens301 tahrens@ Subject: [Repeater-Builder] Antenna SWR = Desense? To: Repeater-Builder@yahoogroups.com Date: Tuesday, September 1, 2009, 2:03 PM Hi folks, Just a bit of an update... got the 6 cavity Telewave duplexer tweaked up - looks like it pretty much hit the specs in the data sheet. With a dummy load at the 'antenna' port, I used an iso-tee to inject a signal at both the receiver input, and between the antenna port the dummy load. With a weak signal, both places showed me that there was no desense. Very weak signal would hold in the repeater. However, putting the system on the antenna (a 150-160 mhz DB-224 100' horizontally 10' vertically separated) through a metal building fed with 7/8 heliax, there seems to be no end to the desense! The wattmeter shows 30 watts forward 3 watts reflected at the antenna port, if my math serves, it's less than 2:1. Can the less than 1:1 match be the culprit? Thanks, Tim W5FN __
Re: [Repeater-Builder] Re: Antenna SWR = Desense?
Tim--- I forgot that you spoke of 100' antenna separation. This suggests no duplexer and two feedlines. The meat of my story is still good---a corroded transmit antenna is capable of making and radiating allot of receive frequency noise ---even with between antenna pattern attenuation, there might well be enough to desense your receiver. Scott - Original Message - From: Scott Overstreet To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 1:24 PM Subject: Re: [Repeater-Builder] Re: Antenna SWR = Desense? Tim Been there and done that! My guess is that you have corrosion in the antenna on top. The corrosion makes a good wide band rectifier of your transmit power and produces sufficient noise at your receive frequency to get back through your duplexer and into your receiver as desense. Actually, come to think about it, the end result of the situation is simular to bad LMR-400. Scott, N6NXI - Original Message - From: tahrens301 To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 9:56 AM Subject: [Repeater-Builder] Re: Antenna SWR = Desense? Hi All, And the winner is. Door # 2. Put the 2 meter vertical up on the stick at the end of the hard line, the desense was worse! Perfect match at the feed line end. Took dummy load put on far end of hard line no desense. Guess it is the proximity to the antenna. Although about 100', guess the RF is getting back into the box. Gonna set the antenna party for Friday morning. The stuff is going up on the tower (unless somebody can see some flaw in my logic can suggest another test)! Thanks again to all! Tim W5FN No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.75/2340 - Release Date: 09/01/09 20:03:00 -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.76/2342 - Release Date: 09/02/09 18:03:00
[Repeater-Builder] Re: Antenna SWR = Desense?
Hi Scott, The 100' of separation is from the repeater to where the antenna is located. I have a Telewave 6 cavity BpBr duplexer on the system. Single feed to one antenna. Thanks, Tim W5FN --- In Repeater-Builder@yahoogroups.com, Scott Overstreet sc...@... wrote: Tim--- I forgot that you spoke of 100' antenna separation. This suggests no duplexer and two feedlines. The meat of my story is still good---a corroded transmit antenna is capable of making and radiating allot of receive frequency noise ---even with between antenna pattern attenuation, there might well be enough to desense your receiver. Scott - Original Message - From: Scott Overstreet To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 1:24 PM Subject: Re: [Repeater-Builder] Re: Antenna SWR = Desense? Tim Been there and done that! My guess is that you have corrosion in the antenna on top. The corrosion makes a good wide band rectifier of your transmit power and produces sufficient noise at your receive frequency to get back through your duplexer and into your receiver as desense. Actually, come to think about it, the end result of the situation is simular to bad LMR-400. Scott, N6NXI - Original Message - From: tahrens301 To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 9:56 AM Subject: [Repeater-Builder] Re: Antenna SWR = Desense? Hi All, And the winner is. Door # 2. Put the 2 meter vertical up on the stick at the end of the hard line, the desense was worse! Perfect match at the feed line end. Took dummy load put on far end of hard line no desense. Guess it is the proximity to the antenna. Although about 100', guess the RF is getting back into the box. Gonna set the antenna party for Friday morning. The stuff is going up on the tower (unless somebody can see some flaw in my logic can suggest another test)! Thanks again to all! Tim W5FN No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.75/2340 - Release Date: 09/01/09 20:03:00 -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.76/2342 - Release Date: 09/02/09 18:03:00
[Repeater-Builder] Re: Antenna SWR = Desense?
I've been following this thread on and off. I was wondering if you tried replacing the 100' plus run of RG-214 with another cable. Or if you have pulled the connectors on each end to see if they are properly installed. (I have had connectors installed by the cable supplier that were bad. in one case a direct short between the shield and center conductor because the cable wasn't properly trimmed, and in another case the shield was deformed during the installation and the distance between it and the center conductor was close enought to short when RF was applied but still not show a short when check with a VOM for continuity.) All it takes is for a couple of strands of the shield braid to be in the wrong place when you key up. to cause all your greif. Also, you might want to do the same with all the other cables (inspect and/or substitute 1 at a time). Barring that I would suggest you change out every adapter/fitting and right angle connector you have in the system, from rptr. to antenna, one at a time to see if the problem lies there as well. The 100' horizotal distance and 10' vertical distance are not where the problem is. You have got a faulty component os sheilding problem. My 2 cents worth. Doug N3DAB --- In Repeater-Builder@yahoogroups.com, tahrens301 tahr...@... wrote: Thanks to all... I guess it could be corrosion at the antenna, but the one that is on it now is pretty simple, not much opportunity for corrosion. I am going to put up the 2nd DB-224 tomorrow see what difference it makes... I don't really think it'll change much, but it will let me play with the matching unit I built see if it works! Don - I can put the iso-tee in line, feed the atten port into the spectrum analyzer. It should show me if the xmtr is having problems. However, the current antenna is a perfect match - no reflected power at all, so I think the xmtr 'should' be happy. The 100' may be the real problem, although everything has very well made cables, quality RG-214, N connectors, etc. Thanks, Tim W5FN --- In Repeater-Builder@yahoogroups.com, purvissid purvissid@ wrote: You mentioned 100 ft hoz separation, I don't think that is enough, but don't have a chart handy where I am now. Sid. --- In Repeater-Builder@yahoogroups.com, tahrens301 tahrens@ wrote: Hi Jim All, Thanks for the info responses. I took down the 224 found that the N connector on the end wasn't quite up to snuff. I am going to put a ham antenna on it - think it's a ringo2 or some such thing, just to see how an antenna with good swr will work in the desense arena. Then I'll put up a different 224 see how it goes. I did see the posting about how to lower the frequency of a 224. Not sure I want to go that route, but might in the end! I built a small matching unit that I'll try out... basically a tuner that will go between the duplexer feedline. One of the guys talked about using a smith chart putting some stubs at the feed line which would change the matching. gee, lots of things to experiment with. That's the fun of it no? :-o Thanks again, I'll post my progress. Tim W5FN --- In Repeater-Builder@yahoogroups.com, Jim Brown w5zit@ wrote: One of the local repeater operators used an antenna at the top of a 100 ft tower that got bent over during last winter storms. He put up a temporary antenna at the tower base and is experiencing some really bad desense with the low antenna. He is using a GE Mastr II base station repeater and had reasonable operation with little desense on the antenna 100 ft above the equipment. The antenna only 15 ft or so above the equipment now and has the bad desense problem. It would appear that the antenna is flooding the equipment with more RF than the shielding can handle. BTW, take a look at some of the previous posts on modifying a DB-224 by adding a 2 inch extension to each end of each dipole to bring it down into the ham band. The SWR does not go completely to 1:1, but does hit a minimum in the middle of the 2 meter ham band. No change to the harness was required to move the antenna frequency. 73 - Jim W5ZIT --- On Tue, 9/1/09, tahrens301 tahrens@ wrote: From: tahrens301 tahrens@ Subject: [Repeater-Builder] Antenna SWR = Desense? To: Repeater-Builder@yahoogroups.com Date: Tuesday, September 1, 2009, 2:03 PM Hi folks, Just a bit of an update... got the 6 cavity Telewave duplexer tweaked up - looks like it pretty much hit the specs in the data sheet. With a dummy load at the 'antenna' port, I used an iso-tee to inject a signal at both the
[Repeater-Builder] Re: Antenna SWR = Desense?
Hi Daniel, I wanted to check things out on the ground before heading up to the tower. So far it's been a trainwreck! Maybe the distance is an issue. Thanks, Tim --- In Repeater-Builder@yahoogroups.com, daniel haines ridet...@... wrote: Why don't you raise the antenna, and get the repeater out of the RF field? To: Repeater-Builder@yahoogroups.com From: tahr...@... Date: Wed, 2 Sep 2009 21:32:35 + Subject: [Repeater-Builder] Re: Antenna SWR = Desense? Hi Scott, The 100' of separation is from the repeater to where the antenna is located. I have a Telewave 6 cavity BpBr duplexer on the system. Single feed to one antenna. Thanks, Tim W5FN --- In Repeater-Builder@yahoogroups.com, Scott Overstreet scott@ wrote: Tim--- I forgot that you spoke of 100' antenna separation. This suggests no duplexer and two feedlines. The meat of my story is still good---a corroded transmit antenna is capable of making and radiating allot of receive frequency noise ---even with between antenna pattern attenuation, there might well be enough to desense your receiver. Scott - Original Message - From: Scott Overstreet To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 1:24 PM Subject: Re: [Repeater-Builder] Re: Antenna SWR = Desense? Tim Been there and done that! My guess is that you have corrosion in the antenna on top. The corrosion makes a good wide band rectifier of your transmit power and produces sufficient noise at your receive frequency to get back through your duplexer and into your receiver as desense. Actually, come to think about it, the end result of the situation is simular to bad LMR-400. Scott, N6NXI - Original Message - From: tahrens301 To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 9:56 AM Subject: [Repeater-Builder] Re: Antenna SWR = Desense? Hi All, And the winner is. Door # 2. Put the 2 meter vertical up on the stick at the end of the hard line, the desense was worse! Perfect match at the feed line end. Took dummy load put on far end of hard line no desense. Guess it is the proximity to the antenna. Although about 100', guess the RF is getting back into the box. Gonna set the antenna party for Friday morning. The stuff is going up on the tower (unless somebody can see some flaw in my logic can suggest another test)! Thanks again to all! Tim W5FN -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.75/2340 - Release Date: 09/01/09 20:03:00 -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.76/2342 - Release Date: 09/02/09 18:03:00
RE: [Repeater-Builder] Re: Antenna SWR = Desense?
Why don't you raise the antenna, and get the repeater out of the RF field? To: Repeater-Builder@yahoogroups.com From: tahr...@swtexas.net Date: Wed, 2 Sep 2009 21:32:35 + Subject: [Repeater-Builder] Re: Antenna SWR = Desense? Hi Scott, The 100' of separation is from the repeater to where the antenna is located. I have a Telewave 6 cavity BpBr duplexer on the system. Single feed to one antenna. Thanks, Tim W5FN --- In Repeater-Builder@yahoogroups.com, Scott Overstreet sc...@... wrote: Tim--- I forgot that you spoke of 100' antenna separation. This suggests no duplexer and two feedlines. The meat of my story is still good---a corroded transmit antenna is capable of making and radiating allot of receive frequency noise ---even with between antenna pattern attenuation, there might well be enough to desense your receiver. Scott - Original Message - From: Scott Overstreet To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 1:24 PM Subject: Re: [Repeater-Builder] Re: Antenna SWR = Desense? Tim Been there and done that! My guess is that you have corrosion in the antenna on top. The corrosion makes a good wide band rectifier of your transmit power and produces sufficient noise at your receive frequency to get back through your duplexer and into your receiver as desense. Actually, come to think about it, the end result of the situation is simular to bad LMR-400. Scott, N6NXI - Original Message - From: tahrens301 To: Repeater-Builder@yahoogroups.com Sent: Wednesday, September 02, 2009 9:56 AM Subject: [Repeater-Builder] Re: Antenna SWR = Desense? Hi All, And the winner is. Door # 2. Put the 2 meter vertical up on the stick at the end of the hard line, the desense was worse! Perfect match at the feed line end. Took dummy load put on far end of hard line no desense. Guess it is the proximity to the antenna. Although about 100', guess the RF is getting back into the box. Gonna set the antenna party for Friday morning. The stuff is going up on the tower (unless somebody can see some flaw in my logic can suggest another test)! Thanks again to all! Tim W5FN -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.75/2340 - Release Date: 09/01/09 20:03:00 -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.76/2342 - Release Date: 09/02/09 18:03:00
[Repeater-Builder] Re: Antenna SWR = Desense?
Hi Doug, I put the connectors on the hardline myself, was very careful in doing so. Also did an RF check with a dummy load on the end, and no loss/problems. I am going to concentrate on the actual connectors from the Quantar. thanks, Tim --- In Repeater-Builder@yahoogroups.com, n3dab rb_n3...@... wrote: I've been following this thread on and off. I was wondering if you tried replacing the 100' plus run of RG-214 with another cable. Or if you have pulled the connectors on each end to see if they are properly installed. (I have had connectors installed by the cable supplier that were bad. in one case a direct short between the shield and center conductor because the cable wasn't properly trimmed, and in another case the shield was deformed during the installation and the distance between it and the center conductor was close enought to short when RF was applied but still not show a short when check with a VOM for continuity.) All it takes is for a couple of strands of the shield braid to be in the wrong place when you key up. to cause all your greif. Also, you might want to do the same with all the other cables (inspect and/or substitute 1 at a time). Barring that I would suggest you change out every adapter/fitting and right angle connector you have in the system, from rptr. to antenna, one at a time to see if the problem lies there as well. The 100' horizotal distance and 10' vertical distance are not where the problem is. You have got a faulty component os sheilding problem. My 2 cents worth. Doug N3DAB
[Repeater-Builder] Re: Antenna SWR = Desense?
I still think it may be something in the vicinity of the antenna. What kind of building is the antenna mounted on/above? You've stated that the repeater is in a metal pole building that's 100ft. away from the antenna. It's been mentioned before in this thread, but that could be a noise nightmare. You'll need to get your antenna much farther away or higher to get away from that noise if that's it. If you have a small beam that you can hand-hold, that might be interesting to point around and see of there's changes in desense. Laryn K8TVZ
[Repeater-Builder] Re: Antenna SWR = Desense?
The antenna is on the top of a small wooden storage building. A mast is placed up against the peak of the roof, and the 224 is on top of that. The metal building that the repeater is in is my garage. Very plain, no air condx, AC power runs around the pearlings about 4' off the ground. Gonna start looking at cables from the Quantar to the duplexer. There was an issue with the RX cable - it is a mini-uhf that connects into the RX casting. The crimp of the braid was not very well connected - I could rotate the entire cable around! Some solder fixed the mechanical aspects of that. Perhaps there was something else. more gray hair is being removed as we speak! haha Thanks, Tim W5FN --- In Repeater-Builder@yahoogroups.com, larynl2 lar...@... wrote: I still think it may be something in the vicinity of the antenna. What kind of building is the antenna mounted on/above? You've stated that the repeater is in a metal pole building that's 100ft. away from the antenna. It's been mentioned before in this thread, but that could be a noise nightmare. You'll need to get your antenna much farther away or higher to get away from that noise if that's it. If you have a small beam that you can hand-hold, that might be interesting to point around and see of there's changes in desense. Laryn K8TVZ
[Repeater-Builder] Re: Narrow Banding and VHF Low Band
Unless someone had a standardized kit, and had the radio tested for recertification by the FCC, then NO. I know of NO pre 1997 radios that have been certificated for adherence to the current emission mask for 'narrowband'. WalterH BTW, it's after 2012. Narrowbanding must be completed PRIOR to January 1, 2013. --- In Repeater-Builder@yahoogroups.com, Tony KT9AC kt...@... wrote: Does anyone know if a MSF5000 converted to narrowband operation would be legal under Part 90 after 2013? Tony SNIP
[Repeater-Builder] Re: Antenna SWR = Desense?
I know the frustration your dealing with. When you did your RF tests, were you keying the XMTR. thru the local mic. or with the rcvr. disabled, or were you in the full rpt. mode and using another radio (HT) or low power signal source? My problems only showed up in the full rpt. mode, after i had checked everthing else in the rpt. disabled mode and everthing look great as far as forward and reflected power, etc. Any way LOL again on locating the glitch. Doug N3DAB --- In Repeater-Builder@yahoogroups.com, tahrens301 tahr...@... wrote: Hi Doug, I put the connectors on the hardline myself, was very careful in doing so. Also did an RF check with a dummy load on the end, and no loss/problems. I am going to concentrate on the actual connectors from the Quantar. thanks, Tim --- In Repeater-Builder@yahoogroups.com, n3dab rb_n3dab@ wrote: I've been following this thread on and off. I was wondering if you tried replacing the 100' plus run of RG-214 with another cable. Or if you have pulled the connectors on each end to see if they are properly installed. (I have had connectors installed by the cable supplier that were bad. in one case a direct short between the shield and center conductor because the cable wasn't properly trimmed, and in another case the shield was deformed during the installation and the distance between it and the center conductor was close enought to short when RF was applied but still not show a short when check with a VOM for continuity.) All it takes is for a couple of strands of the shield braid to be in the wrong place when you key up. to cause all your greif. Also, you might want to do the same with all the other cables (inspect and/or substitute 1 at a time). Barring that I would suggest you change out every adapter/fitting and right angle connector you have in the system, from rptr. to antenna, one at a time to see if the problem lies there as well. The 100' horizotal distance and 10' vertical distance are not where the problem is. You have got a faulty component os sheilding problem. My 2 cents worth. Doug N3DAB
[Repeater-Builder] Re: Text missing
Yahoo is notorious for not handling HTML mail very well. Plus, if you are using Outlook, there is a specific issue with the way it codes quoted material. Best suggestion is to send only in plain text, and have it delivered in Traditional' not 'Fully Featured' format. WalterH --- In Repeater-Builder@yahoogroups.com, kerinvale kerin...@... wrote: Hi guys .I was wondering in my last posts some of my text was missing when I received the email . Is it a fault this end or is in the settings of the yahoo group Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Re: [Repeater-Builder] Re: Text missing
Thanks I am using incredimail .ill check the settings Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au ---Original Message--- From: ka1jfy Date: 3/09/2009 08:52:13 To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Text missing Yahoo is notorious for not handling HTML mail very well. Plus, if you are using Outlook, there is a specific issue with the way it codes quoted material. Best suggestion is to send only in plain text, and have it delivered in Traditional' not 'Fully Featured' format. WalterH --- In Repeater-Builder@yahoogroups.com, kerinvale kerin...@... wrote: Hi guys .I was wondering in my last posts some of my text was missing when I received the email . Is it a fault this end or is in the settings of the yahoo group Thank You, Ian Wells, Kerinvale Comaudio, 361 Camboon Road.Biloela.4715 Phone 0749922574 or 0409159932 www.kerinvalecomaudio.com.au
Fw: Re: [Repeater-Builder] Re: Antenna SWR = Desense?
Does anybody use anything like Caig's DeOxit products? I'd treat each every connector in the system, inside outside the electronic cabinets, e.g. coax connectors. I find it works extremely well, indoors out. I've been using it for years. I have restored equipment rendered near-useless by bad switch contacts, connectors, even tube pins/sockets. Even an old Ford Tempo that could not be fixed--Caig'd every connector I could get to all its intermittent problems went away. Not really cheap but worth it to me. Lots of info at: www.caig.com PS I have NO commericial interest in Caig. --John WB0EQ --- On Wed, 9/2/09, Scott Overstreet sc...@becklawfirm.com wrote: From: Scott Overstreet sc...@becklawfirm.com Subject: Re: [Repeater-Builder] Re: Antenna SWR = Desense? To: Repeater-Builder@yahoogroups.com Date: Wednesday, September 2, 2009, 2:24 PM Tim Been there and done that! My guess is that you have corrosion in the antenna on top. The corrosion makes a good wide band rectifier of your transmit power and produces sufficient noise at your receive frequency to get back through your duplexer and into your receiver as desense. Actually, come to think about it, the end result of the situation is simular to bad LMR-400. Scott, N6NXI --
RE: [Repeater-Builder] Re: Antenna SWR = Desense?
Tim, I believe you stated in a previous message that the antenna was 100 feet away, horizontally. That is light years away from it being 100 feet ABOVE the repeater. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of tahrens301 Sent: Wednesday, September 02, 2009 9:57 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Antenna SWR = Desense? Hi All, And the winner is. Door # 2. Put the 2 meter vertical up on the stick at the end of the hard line, the desense was worse! Perfect match at the feed line end. Took dummy load put on far end of hard line no desense. Guess it is the proximity to the antenna. Although about 100', guess the RF is getting back into the box. Gonna set the antenna party for Friday morning. The stuff is going up on the tower (unless somebody can see some flaw in my logic can suggest another test)! Thanks again to all! Tim W5FN
Re: [Repeater-Builder] COR board for simple repeater??
Hi Gervais' You can check with this site www.hs9dmc.com. Regards 9w6man --- Pada Khm, 20/8/09, Rick Szajkowski va3r...@gmail.com menulis: Daripada: Rick Szajkowski va3r...@gmail.com Subjek: Re: [Repeater-Builder] COR board for simple repeater?? Kepada: Repeater-Builder@yahoogroups.com Tarikh: Khamis, 20 Ogos, 2009, 6:27 AM hi Gervais I have such a item .. its an alinco controller it was ment to have 2 HTs on it .. or even one and then act as a 'parrot' repeater if you would like more info email me off list On Wed, Aug 19, 2009 at 5:19 PM, gervaisve2...@hotmail. com wrote: Hi all i am looking a COR board that i could use between 2 walkie-talkie that would be used here as a replacement for my regular repeater in case of accident.. i have seen this many years ago,an amateur built his own repeater with 2 talkie's,simple and efficient. So maybe someone know where i could find such a board,,,controler what ever you call it,no need for queue,,,just a simple repeater. thanks Gervais ve2ckn Enjoy more chat on blogs and websites. Experience it with the Online Pingbox Creation Wizard. http://my.messenger.yahoo..com/pingbox
Re: [Repeater-Builder] PDF Page Scanner Choices?
Finally got around to looking at the model number... It's a Fujitsu fi-5750c. Several on eBay right now, a couple are under $1000. As I said, the automatic document feeder will take 11 x whatever schematics (largest Moto page I've encountered was 11x37), and it'll even scan both sides of the page at once... George, KA3HSW / WQGJ413 - Original Message - From: George Henry ka3...@att.net To: Repeater-Builder@yahoogroups.com Sent: Friday, August 21, 2009 11:01 PM Subject: Re: [Repeater-Builder] PDF Page Scanner Choices? I use a Fujitsu flatbed scanner at the office that also has an automatic document feeder (ADF) for single sheets - I'll get you the model number on Monday. It will even scan the 11x30+ inch diagrams out of the Moto manuals... The software that came with it (Paper Port?) scans directly to PDF. George, KA3HSW / WQGJ413
Re: [Repeater-Builder] Re: Antenna SWR = Desense?
On Sep 2, 2009, at 3:16 PM, tahrens301 wrote: Don - I can put the iso-tee in line, feed the atten port into the spectrum analyzer. It should show me if the xmtr is having problems. However, the current antenna is a perfect match - no reflected power at all, so I think the xmtr 'should' be happy. Remember also... (just saying as a side-note, may not apply to THIS situation)... that a 50 ohm dummy load and hardline that doesn't radiate is also a perfect match. Sometimes you need to see if the antenna is REALLY radiating as it should be. (And this is difficult, but do-able.) If it looks like it doesn't perform as well as a similar or preferably the SAME antenna type at the SAME location, that's a great way to determine that there's something wrong and any such antenna is suspect from then on of horrible Passive IM mixes, or other site nastiness. You mentioned swapping in a ham quality antenna. It's a tempting troubleshooting technique, but if there are a bunch of transmitters on that site... don't leave it that way. All those joints on those floppy hunks of junk will EVENTUALLY bite either you, or more likely, someone else in the butt with a mix, as the antenna gets old and loose RF joints become little diodes... I'm still pretty sure you're fighting an external MIX of your own transmitter with something... in an active component of someone else's PA, in a rusty joint of that metal building, a loose/rusty bolt on the tower... and these things are a real PITA to find in a duplexed system, especially when you have nice gear like the DB antenna and good feedline and really WANT to assume everything's good, before you start ripping it apart, piece by piece... only to find that you've replaced EVERYTHING and the problem still exists. I'm tellin' ya... repeaters that have problems like this, WILL make you crazy. (This list is proof positive! GRIN!) :-) Or as a good friend puts it, Passive Intermod, the devil's snack food. -- Nate Duehr, WY0X n...@natetech.com facebook.com/denverpilot twitter.com/denverpilot
[Repeater-Builder] Re: Antenna SWR = Desense?
Hi Eric, Hmmm, don't think I said above the station, but if I implied it, no, it's horizontal. I can look out the window see it! Nate - I only tried the 'ham quality' antenna because I knew it would be a better match than the DB224. It was easy to change, standing on a 6' ladder! Just wanted to see if a poor swr would induce the desense. There are no other communications systems within miles of my location, so who knows. Perhaps the metal building is the problem. A side question, dealing with separation. Obviously, when you are using a split site, vertical separation makes you a lot more $ than horizontal does. But, in this type of situation, where you are a single antenna with a duplexer, what real difference does vertical or horizontal separation from the station make? If I'm horizontal, could turn the whole system on it's side (including the antenna system), then it would be vertical. The straws that I'm grasping are getting smaller!! Thanks to all! Tim W5FN
