[Repeater-Builder] Re: Two coax and connector questions
So what about the other question?.. using heliax in mobile installation What frequency? What power? What type of antenna mount?, and antenna? --- In Repeater-Builder@yahoogroups.com, hitekgearhead hitekgearh...@... wrote: Really?. is that the real purpose of reverse-polarity connectors? I am quite flabbergasted.. So what about the other question?.. using heliax in mobile installations? Thanks Albert --- In Repeater-Builder@yahoogroups.com, Glenn Little WB4UIV glennmaillist@ wrote: We all know that they are available. But, this is the way out to get the type acceptance. The FCC is all lawyers with no technical people on staff. 73 Glenn WB4UIV At 09:27 PM 3/3/2010, you wrote: Actually, RP-type (RP-SMA, RP-TNC, etc.) connectors are very easily available to the general public. wlan-parts.com oddcables.com etc, etc, etc. -Brian / KF4ZWZ On Wed, Mar 3, 2010 at 6:11 PM, Glenn Little WB4UIV glennmaillist@ wrote: Reverse threaded connectors are used to get a piece of equipment past FCC type acceptance. The type acceptance paper work specifies the antenna that is used for acceptance. Any other antenna voids the type acceptance. Since reverse threaded connectors are not available to the general public, the FCC bought off on this to prevent the antenna from being changed. Another trick that is used is a connector with the wrong sex center conductor pin. 73 Glenn WB4UIV At 06:08 PM 3/3/2010, you wrote: Hey guys, I was wondering if you all would entertain two questions that I have. First, what is the purpose/use of reverse polarity coax connectors such as SMA and TNC? I assume there are others but those are the ones I have seen. Secondly, I ran across something regarding using small diameter heliax in a mobile environment. I had never heard of that before and it seemed like it would be prone to vibration problems. I am probably wrong though. Anyone care to shed some light on that subject? Thanks Albert
Re: [Repeater-Builder] Re: Two coax and connector questions
Antenna Specialists used to sell a mobile antenna mount option using small diameter heliax. Chuck WB2EDV - Original Message - From: larryjspamme...@teleport.com To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 2:08 AM Subject: Re: [Repeater-Builder] Re: Two coax and connector questions The only people I've ever seen using heliax (1/2) to run to their mobile antennas, wattmeters, etc. are those CB'ers who like to do the High-Power Shootouts. The setups I've actually seen up close are typically rigs like Chevy Suburbans with big banks of batteries in the rear, multiple alternators, and a 9-12 KW+ Dave-Made, Skullcrackka, or other specialty 11M amp, feeding their up-front Bird wattmeters and the big antennas on the roof (mounted on big blocks of plexiglass) with 1/2 heliax. I've seen them at ham swap meets looking for short lengths of 1/2 heliax and UHF Andrew heliax connectors to go with it.
RE: [Repeater-Builder] Re: Two coax and connector questions
Did you see annular heliax or a superflex variant? The superflex varieties give more flex hence the name and should hold up in a semi flex environment of a mobile. Annular corrugation looks like the bellows of a shock absorber boot while the superflex variants look like the threads of a screw. [the shield] 3/8 inch superflex is soldered into a normal pl-259 quite often so I'm sure someone has used it in a mobile at one point or another. 'bout all I can help you with on the heliax in a mobile installation. Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of wb6dgn Sent: Thursday, March 04, 2010 5:37 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Two coax and connector questions So what about the other question?.. using heliax in mobile installation What frequency? What power? What type of antenna mount?, and antenna? --- In Repeater-Builder@yahoogroups.com, hitekgearhead hitekgearh...@... wrote: Really?. is that the real purpose of reverse-polarity connectors? I am quite flabbergasted.. So what about the other question?.. using heliax in mobile installations? Thanks Albert --- In Repeater-Builder@yahoogroups.com, Glenn Little WB4UIV glennmaillist@ wrote: We all know that they are available. But, this is the way out to get the type acceptance. The FCC is all lawyers with no technical people on staff. 73 Glenn WB4UIV At 09:27 PM 3/3/2010, you wrote: Actually, RP-type (RP-SMA, RP-TNC, etc.) connectors are very easily available to the general public. wlan-parts.com oddcables.com etc, etc, etc. -Brian / KF4ZWZ On Wed, Mar 3, 2010 at 6:11 PM, Glenn Little WB4UIV glennmaillist@ wrote: Reverse threaded connectors are used to get a piece of equipment past FCC type acceptance. The type acceptance paper work specifies the antenna that is used for acceptance. Any other antenna voids the type acceptance. Since reverse threaded connectors are not available to the general public, the FCC bought off on this to prevent the antenna from being changed. Another trick that is used is a connector with the wrong sex center conductor pin. 73 Glenn WB4UIV At 06:08 PM 3/3/2010, you wrote: Hey guys, I was wondering if you all would entertain two questions that I have. First, what is the purpose/use of reverse polarity coax connectors such as SMA and TNC? I assume there are others but those are the ones I have seen. Secondly, I ran across something regarding using small diameter heliax in a mobile environment. I had never heard of that before and it seemed like it would be prone to vibration problems. I am probably wrong though. Anyone care to shed some light on that subject? Thanks Albert Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.435 / Virus Database: 271.1.1/2705 - Release Date: 03/03/10 19:34:00
[Repeater-Builder] Interference
Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI
Re: [Repeater-Builder] Re: Two coax and connector questions
This explains a lot. I was at a hamfest up in New Hampshire and a couple of guys were buying a 15 foot length of 1 5/8 heliax for a CB mobile installation. Joe larryjspamme...@teleport.com wrote: The only people I've ever seen using heliax (1/2) to run to their mobile antennas, wattmeters, etc. are those CB'ers who like to do the High-Power Shootouts.
Re: [Repeater-Builder] Interference
On 3/4/2010 8:56 AM, Leroy A. M. Baptiste wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI Is there another FM station on either 95.1 or 93.9? Guess what-600 KHz! Natural intermod source!
[Repeater-Builder] Re: Two coax and connector questions
The only thing I found on the Tessco site was under non Motorola Mounts listed as: 800-1990 MHz 17 feet No connector supplied ProFlex Plus Not familiar with that cable but it doesn't look like a heliax variation. As someone else noted, the smaller heliax sizes probably could be adapted pretty easily but I'm curious why? --- In Repeater-Builder@yahoogroups.com, Chris Curtis demo...@... wrote: Did you see annular heliax or a superflex variant? The superflex varieties give more flex hence the name and should hold up in a semi flex environment of a mobile. Annular corrugation looks like the bellows of a shock absorber boot while the superflex variants look like the threads of a screw. [the shield] 3/8 inch superflex is soldered into a normal pl-259 quite often so I'm sure someone has used it in a mobile at one point or another. 'bout all I can help you with on the heliax in a mobile installation. Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of wb6dgn Sent: Thursday, March 04, 2010 5:37 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Two coax and connector questions So what about the other question?.. using heliax in mobile installation What frequency? What power? What type of antenna mount?, and antenna? --- In Repeater-Builder@yahoogroups.com, hitekgearhead hitekgearhead@ wrote: Really?. is that the real purpose of reverse-polarity connectors? I am quite flabbergasted.. So what about the other question?.. using heliax in mobile installations? Thanks Albert --- In Repeater-Builder@yahoogroups.com, Glenn Little WB4UIV glennmaillist@ wrote: We all know that they are available. But, this is the way out to get the type acceptance. The FCC is all lawyers with no technical people on staff. 73 Glenn WB4UIV At 09:27 PM 3/3/2010, you wrote: Actually, RP-type (RP-SMA, RP-TNC, etc.) connectors are very easily available to the general public. wlan-parts.com oddcables.com etc, etc, etc. -Brian / KF4ZWZ On Wed, Mar 3, 2010 at 6:11 PM, Glenn Little WB4UIV glennmaillist@ wrote: Reverse threaded connectors are used to get a piece of equipment past FCC type acceptance. The type acceptance paper work specifies the antenna that is used for acceptance. Any other antenna voids the type acceptance. Since reverse threaded connectors are not available to the general public, the FCC bought off on this to prevent the antenna from being changed. Another trick that is used is a connector with the wrong sex center conductor pin. 73 Glenn WB4UIV At 06:08 PM 3/3/2010, you wrote: Hey guys, I was wondering if you all would entertain two questions that I have. First, what is the purpose/use of reverse polarity coax connectors such as SMA and TNC? I assume there are others but those are the ones I have seen. Secondly, I ran across something regarding using small diameter heliax in a mobile environment. I had never heard of that before and it seemed like it would be prone to vibration problems. I am probably wrong though. Anyone care to shed some light on that subject? Thanks Albert Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.435 / Virus Database: 271.1.1/2705 - Release Date: 03/03/10 19:34:00
Re: [Repeater-Builder] Interference
I have a 1KW 103.5 FM Station on the same tower as my 147.21 Repeater. I cleared most of my SAME problems up with a circulator on the 7.21 transmitter and Ferrite Snap On's on any exposed audio line to the repeater. NOW that being said, the FM Station is using large good quality hardline. They had a bad jumper from the Hardline to the Transmitter and when that was replaced the interference was reduced. Now I have installed a 440 Repeater and suddenly I am hearing the FM on the tail of UHF so again I will be trying the same things. Good Luck. 73 JIM Wellsville KA2AJH On Thu, Mar 4, 2010 at 8:56 AM, Leroy A. M. Baptiste leroybapti...@spiceisle.com wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater’s receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI -- Jim Cicirello 181 Stevens Street Wellsville, N.Y. 14895 (585)593-4655
RE: [Repeater-Builder] Interference
The only other station in the building is on 107.500MHz -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wd8chl Sent: Thursday, March 04, 2010 10:21 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Interference On 3/4/2010 8:56 AM, Leroy A. M. Baptiste wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI Is there another FM station on either 95.1 or 93.9? Guess what-600 KHz! Natural intermod source!
Re: [Repeater-Builder] Interference
On 3/4/2010 9:40 AM, Leroy A. M. Baptiste wrote: The only other station in the building is on 107.500MHz Doesn't have to be that close. It could be 10-15 miles away or more, depending on power, etc. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wd8chl Sent: Thursday, March 04, 2010 10:21 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Interference On 3/4/2010 8:56 AM, Leroy A. M. Baptiste wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI Is there another FM station on either 95.1 or 93.9? Guess what-600 KHz! Natural intermod source!
Re: [Repeater-Builder] Interference
On 3/4/2010 9:40 AM, Leroy A. M. Baptiste wrote: The only other station in the building is on 107.500MHz It could also be from an AM station on 600 KHZ +/-10 KHz. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wd8chl Sent: Thursday, March 04, 2010 10:21 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Interference On 3/4/2010 8:56 AM, Leroy A. M. Baptiste wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI Is there another FM station on either 95.1 or 93.9? Guess what-600 KHz! Natural intermod source!
Re: [Repeater-Builder] Interference
Interesting problem, can you describe the interference?? --- On Thu, 3/4/10, wd8chl wd8...@gmail.com wrote: From: wd8chl wd8...@gmail.com Subject: Re: [Repeater-Builder] Interference To: Repeater-Builder@yahoogroups.com Date: Thursday, March 4, 2010, 6:57 AM On 3/4/2010 9:40 AM, Leroy A. M. Baptiste wrote: The only other station in the building is on 107.500MHz It could also be from an AM station on 600 KHZ +/-10 KHz. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wd8chl Sent: Thursday, March 04, 2010 10:21 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Interference On 3/4/2010 8:56 AM, Leroy A. M. Baptiste wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI Is there another FM station on either 95.1 or 93.9? Guess what-600 KHz! Natural intermod source! Yahoo! Groups Links
Re: [Repeater-Builder] Two coax and connector questions
On Mar 3, 2010, at 9:09 PM, Glenn Little WB4UIV wrote: The FCC is all lawyers with no technical people on staff. I know at least two technical people on their staff. :-) But they're way too busy dealing with bigger fish to fry than worrying about Amateur Radio silliness. -- Nate Duehr, WY0X n...@natetech.com
[Repeater-Builder] Low Band DB-212 antenna questions.
Has anyone had any experience with DB-212 low band type loop antennas mounted back to back at the same elevation on a mast or tower? What type of pattern did they have? How did they compare with a ground plane? Would it be better to use one loop instead of two at the same elevation? If the loops can be separated what is the minimum for 52MHz? Wayne, WA5LUY
Re: [Repeater-Builder] Low Band DB-212 antenna questions.
Addition to previous response that I sent. A single dipole will give you gain in the direction it is pointed. Dual dipoles at the same elevation should negate the gain, but create an omni pattern. I've experienced narrower bandwidth mounting one on a mast. Moving the same dipole onto a tower gives it a broader bandwidth. Chuck WB2EDV - Original Message - From: Wayne wa5...@cablelynx.com To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 10:54 AM Subject: [Repeater-Builder] Low Band DB-212 antenna questions. Has anyone had any experience with DB-212 low band type loop antennas mounted back to back at the same elevation on a mast or tower? What type of pattern did they have? How did they compare with a ground plane? Would it be better to use one loop instead of two at the same elevation? If the loops can be separated what is the minimum for 52MHz? Wayne, WA5LUY
RE: [Repeater-Builder] Interference
When you key up the repeater, and you release, the repeater is held open (Sometimes), and you can hear the interference coming in. If I disconnect the FM Station, the repeater is as clean as a whistle. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chris Quirk Sent: Thursday, March 04, 2010 11:34 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Interference Interesting problem, can you describe the interference?? --- On Thu, 3/4/10, wd8chl wd8...@gmail.com wrote: From: wd8chl wd8...@gmail.com Subject: Re: [Repeater-Builder] Interference To: Repeater-Builder@yahoogroups.com Date: Thursday, March 4, 2010, 6:57 AM On 3/4/2010 9:40 AM, Leroy A. M. Baptiste wrote: The only other station in the building is on 107.500MHz It could also be from an AM station on 600 KHZ +/-10 KHz. -Original Message- From: Repeater-Builder@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-buil...@yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-buil...@yahoogroups.com ] On Behalf Of wd8chl Sent: Thursday, March 04, 2010 10:21 PM To: Repeater-Builder@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-buil...@yahoogroups.com Subject: Re: [Repeater-Builder] Interference On 3/4/2010 8:56 AM, Leroy A. M. Baptiste wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI Is there another FM station on either 95.1 or 93.9? Guess what-600 KHz! Natural intermod source! Yahoo! Groups Links http://groups.yahoo.com/group/Repeater-Builder/ http://groups.yahoo.com/group/Repeater-Builder/ http://groups.yahoo.com/group/Repeater-Builder/joi n http://groups.yahoo.com/group/Repeater-Builder/jo in (Yahoo! ID required) repeater-builder-dig...@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-builder-fullfeatu...@yahoogroups.com repeater-builder-unsubscr...@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-builder-unsubscr...@yahoogroups.com http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Low Band DB-212 antenna questions.
Although I've never done a back-to-back, I read that it can be done that way. You should see pretty much omni coverage, but no gain. To get gain, the elements need to be spaced along the tower between .85 and .95 wavelength, center to center. Chuck WB2EDV - Original Message - From: Wayne wa5...@cablelynx.com To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 10:54 AM Subject: [Repeater-Builder] Low Band DB-212 antenna questions. Has anyone had any experience with DB-212 low band type loop antennas mounted back to back at the same elevation on a mast or tower? What type of pattern did they have? How did they compare with a ground plane? Would it be better to use one loop instead of two at the same elevation? If the loops can be separated what is the minimum for 52MHz? Wayne, WA5LUY
Re: [Repeater-Builder] Low Band DB-212 antenna questions.
Although I've never done a back-to-back, I read that it can be done that way. You should see pretty much omni coverage, but no gain. To get gain, the elements need to be spaced along the tower between .85 and .95 wavelength, center to center. Chuck WB2EDV - Original Message - From: Wayne wa5...@cablelynx.com To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 10:54 AM Subject: [Repeater-Builder] Low Band DB-212 antenna questions. Has anyone had any experience with DB-212 low band type loop antennas mounted back to back at the same elevation on a mast or tower? What type of pattern did they have? How did they compare with a ground plane? Would it be better to use one loop instead of two at the same elevation? If the loops can be separated what is the minimum for 52MHz? Wayne, WA5LUY
Re: [Repeater-Builder] Two coax and connector questions
Check www.therfc.com They have reverse polarity and reverse thread connectors From: Glenn Little WB4UIV glennmaill...@bellsouth.net To: Repeater-Builder@yahoogroups.com Sent: Wed, March 3, 2010 8:11:21 PM Subject: Re: [Repeater-Builder] Two coax and connector questions Reverse threaded connectors are used to get a piece of equipment past FCC type acceptance. The type acceptance paper work specifies the antenna that is used for acceptance. Any other antenna voids the type acceptance. Since reverse threaded connectors are not available to the general public, the FCC bought off on this to prevent the antenna from being changed. Another trick that is used is a connector with the wrong sex center conductor pin. 73 Glenn WB4UIV At 06:08 PM 3/3/2010, you wrote: Hey guys, I was wondering if you all would entertain two questions that I have. First, what is the purpose/use of reverse polarity coax connectors such as SMA and TNC? I assume there are others but those are the ones I have seen. Secondly, I ran across something regarding using small diameter heliax in a mobile environment. I had never heard of that before and it seemed like it would be prone to vibration problems. I am probably wrong though. Anyone care to shed some light on that subject? Thanks Albert Yahoo! Groups Links Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Interference
my 2 penny worth, what happens with the rptr aerial disconnected if it is the clean the signal is coming down the aerial, try using a piece of coax cut as a 1/4 wave stubb on the rptr rx input, this is of course cut to the offending freq Steve, M1SWB - Original Message - From: Leroy A. M. Baptiste leroybapti...@spiceisle.com To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 3:53 PM Subject: RE: [Repeater-Builder] Interference When you key up the repeater, and you release, the repeater is held open (Sometimes), and you can hear the interference coming in. If I disconnect the FM Station, the repeater is as clean as a whistle. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Chris Quirk Sent: Thursday, March 04, 2010 11:34 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Interference Interesting problem, can you describe the interference?? --- On Thu, 3/4/10, wd8chl wd8...@gmail.com wrote: From: wd8chl wd8...@gmail.com Subject: Re: [Repeater-Builder] Interference To: Repeater-Builder@yahoogroups.com Date: Thursday, March 4, 2010, 6:57 AM On 3/4/2010 9:40 AM, Leroy A. M. Baptiste wrote: The only other station in the building is on 107.500MHz It could also be from an AM station on 600 KHZ +/-10 KHz. -Original Message- From: Repeater-Builder@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-buil...@yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-buil...@yahoogroups.com ] On Behalf Of wd8chl Sent: Thursday, March 04, 2010 10:21 PM To: Repeater-Builder@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-buil...@yahoogroups.com Subject: Re: [Repeater-Builder] Interference On 3/4/2010 8:56 AM, Leroy A. M. Baptiste wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI Is there another FM station on either 95.1 or 93.9? Guess what-600 KHz! Natural intermod source! Yahoo! Groups Links http://groups.yahoo.com/group/Repeater-Builder/ http://groups.yahoo.com/group/Repeater-Builder/ http://groups.yahoo.com/group/Repeater-Builder/joi n http://groups.yahoo.com/group/Repeater-Builder/jo in (Yahoo! ID required) repeater-builder-dig...@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-builder-dig...@yahoogroups.com repeater-builder-fullfeatu...@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-builder-fullfeatu...@yahoogroups.com repeater-builder-unsubscr...@yahoogroups.com http://us.mc456.mail.yahoo.com/mc/compose?to=Repe ater-builder-unsubscr...@yahoogroups.com http://docs.yahoo.com/info/terms/ Yahoo! Groups Links
Re: [Repeater-Builder] Re: Two coax and connector questions
In the early days of 800 MHz land mobile, 1/4 superflex was used in mobiles (trucks) with runs longer than 15 feet. they went to the fin type transit antenna so connectors were used on both ends. From: wb6dgn tallins...@yahoo.com To: Repeater-Builder@yahoogroups.com Sent: Thu, March 4, 2010 8:25:08 AM Subject: [Repeater-Builder] Re: Two coax and connector questions The only thing I found on the Tessco site was under non Motorola Mounts listed as: 800-1990 MHz 17 feet No connector supplied ProFlex Plus Not familiar with that cable but it doesn't look like a heliax variation. As someone else noted, the smaller heliax sizes probably could be adapted pretty easily but I'm curious why? --- In Repeater-Builder@yahoogroups.com, Chris Curtis demo...@... wrote: Did you see annular heliax or a superflex variant? The superflex varieties give more flex hence the name and should hold up in a semi flex environment of a mobile. Annular corrugation looks like the bellows of a shock absorber boot while the superflex variants look like the threads of a screw. [the shield] 3/8 inch superflex is soldered into a normal pl-259 quite often so I'm sure someone has used it in a mobile at one point or another. 'bout all I can help you with on the heliax in a mobile installation. Kb0wlf -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:Repeater- buil...@yahoogroups.com] On Behalf Of wb6dgn Sent: Thursday, March 04, 2010 5:37 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Two coax and connector questions So what about the other question?.. using heliax in mobile installation What frequency? What power? What type of antenna mount?, and antenna? --- In Repeater-Builder@yahoogroups.com, hitekgearhead hitekgearhead@ wrote: Really?. is that the real purpose of reverse-polarity connectors? I am quite flabbergasted.. So what about the other question?.. using heliax in mobile installations? Thanks Albert --- In Repeater-Builder@yahoogroups.com, Glenn Little WB4UIV glennmaillist@ wrote: We all know that they are available. But, this is the way out to get the type acceptance. The FCC is all lawyers with no technical people on staff. 73 Glenn WB4UIV At 09:27 PM 3/3/2010, you wrote: Actually, RP-type (RP-SMA, RP-TNC, etc.) connectors are very easily available to the general public. wlan-parts.com oddcables.com etc, etc, etc. -Brian / KF4ZWZ On Wed, Mar 3, 2010 at 6:11 PM, Glenn Little WB4UIV glennmaillist@ wrote: Reverse threaded connectors are used to get a piece of equipment past FCC type acceptance. The type acceptance paper work specifies the antenna that is used for acceptance. Any other antenna voids the type acceptance. Since reverse threaded connectors are not available to the general public, the FCC bought off on this to prevent the antenna from being changed. Another trick that is used is a connector with the wrong sex center conductor pin. 73 Glenn WB4UIV At 06:08 PM 3/3/2010, you wrote: Hey guys, I was wondering if you all would entertain two questions that I have. First, what is the purpose/use of reverse polarity coax connectors such as SMA and TNC? I assume there are others but those are the ones I have seen. Secondly, I ran across something regarding using small diameter heliax in a mobile environment. I had never heard of that before and it seemed like it would be prone to vibration problems. I am probably wrong though. Anyone care to shed some light on that subject? Thanks Albert Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.435 / Virus Database: 271.1.1/2705 - Release Date: 03/03/10 19:34:00 Yahoo! Groups Links http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Interference
Are you hearing the audio from the FM station clearly through the 2 meter repeater? If so, the problem may not be coming from the antenna system. It may be coming in on the AC power line or the FM station ground system. You may try putting a dummy load on the farthest point that is possible, such as the jumper that connects to the hard line. You might also try powering the repeater off a battery and unplug/disconnect the AC power supply. In either case, you should not hear the interference. I had a similar problem from an FM broadcast station that had it's transmitter on the second floor of a wood building. The building was on top of a hill that was all rock. It turned out that the radiation was coming from the long ground wire that went to an old, ineffective ground system. The system that was hearing the interference was ~10 miles away. 73, Joe, K1ike Leroy A. M. Baptiste wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater’s receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI 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: repeater-builder-dig...@yahoogroups.com 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] Interference
The 2m repeater and FM transmitter are at the same site? lh On Thu, Mar 4, 2010 at 8:56 AM, Leroy A. M. Baptiste leroybapti...@spiceisle.com wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater’s receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI
RE: [Repeater-Builder] Interference
Yes, they are. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Larry Horlick Sent: Friday, March 05, 2010 1:36 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Interference The 2m repeater and FM transmitter are at the same site? lh On Thu, Mar 4, 2010 at 8:56 AM, Leroy A. M. Baptiste leroybapti...@spiceisle.com mailto:leroybapti...@spiceisle.com wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI
[Repeater-Builder] Re: Interference
--- In Repeater-Builder@yahoogroups.com, Leroy A. M. Baptiste leroybapti...@... wrote: When you key up the repeater, and you release, the repeater is held open (Sometimes) What do you mean by held open? Is the interference opening/keeping open the squelch of the repeater receiver, or are you hearing it with the squelch closed during the TX tail? , and you can hear the interference coming in. Is the interference audio relatively clean/undistorted, or loud, raspy, distorted? Is the interference always there, or quite intermittent? Laryn K8TVZ
[Repeater-Builder] Frequency Agile Controller
Hello Chuck, Doug and others. I put the website some of you had referenced back on line with a new URL - www.k3jls.net. I have been doing some secondary work on using another chip - a Motorola Flash Programmable part that will work with the same radios and which will allow the storage on 100 channels with alpha tags just like today's modern FM rigs. I updated the code a couple of years ago and will be building the prototype some time this year (I hope). Time permitting, I'll also try to integrate the CTCSS function into the M/P to simplify the design. However, the primary reason for the site is to promote an automatic magnetic loop antenna controller that I built for myself and which works very well. 73's - Joe - K3JLS
Re: [Repeater-Builder] Low Band DB-212 antenna questions.
A bigger problem would be getting the impedance matched with a harness since the dipole feed point impedance when mounted on a pipe or tower is difficult to know without having measured it. Getting a desireable radiation pattern is important but not having the dipoles impedance matched to accept the RF is paramont. WA9ZZU --- On Thu, 3/4/10, Chuck Kelsey wb2...@roadrunner.com wrote: From: Chuck Kelsey wb2...@roadrunner.com Subject: Re: [Repeater-Builder] Low Band DB-212 antenna questions. To: Repeater-Builder@yahoogroups.com Date: Thursday, March 4, 2010, 10:25 AM Although I've never done a back-to-back, I read that it can be done that way. You should see pretty much omni coverage, but no gain. To get gain, the elements need to be spaced along the tower between .85 and .95 wavelength, center to center. Chuck WB2EDV - Original Message - From: Wayne wa5...@cablelynx. com To: Repeater-Builder@ yahoogroups. com Sent: Thursday, March 04, 2010 10:54 AM Subject: [Repeater-Builder] Low Band DB-212 antenna questions. Has anyone had any experience with DB-212 low band type loop antennas mounted back to back at the same elevation on a mast or tower? What type of pattern did they have? How did they compare with a ground plane? Would it be better to use one loop instead of two at the same elevation? If the loops can be separated what is the minimum for 52MHz? Wayne, WA5LUY
Re: [Repeater-Builder] Re: Interference
Please provide make and model of repeater, controller, duplexer and input frequency.
[Repeater-Builder] Re: Low Band DB-212 antenna questions.
I believe Phelps Dodge sold that configuration (loops back to back on a support pipe) as a railroad antenna, oriented in the direction of the tracks so they could communicate with trains coming and going. I remember the patterns showing an interesting cardiod in both directions. Compared to a ground plane it would not be omni directional but show gain in at least two large patterns, enough to cover a lot of area and much better than a single loop. the Nixa MO repeater uses 6 side mounted loops fed with a feed harness designed by an engineer at Andrew. Lots of 75 Ohm cable required for such an arrangement. Andrew makes 75 Ohm foam cable for this but the connectors are very hard to find. W6 MTF --- In Repeater-Builder@yahoogroups.com, Wayne wa5...@... wrote: Has anyone had any experience with DB-212 low band type loop antennas mounted back to back at the same elevation on a mast or tower? What type of pattern did they have? How did they compare with a ground plane? Would it be better to use one loop instead of two at the same elevation? If the loops can be separated what is the minimum for 52MHz? Wayne, WA5LUY
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
That IS the item... ReconRobotics' website has the disclaimer that the device has not received FCC authorization may not be sold. It has been reported to eBay as not FCC-authorized and should be pulled quickly. George, KA3HSW / WQGJ413 From: wa1nh wa...@arrl.net To: Repeater-Builder@yahoogroups.com Sent: Wed, March 3, 2010 10:40:10 PM Subject: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band 180455347338 Just sent some pointed questions to the seller. Hope this is NOT the device. --- In Repeater-Builder@ yahoogroups. com, DCFluX dcf...@... wrote: Got the auction number? On Wed, Mar 3, 2010 at 9:30 PM, wa1nh wa...@... wrote: UMM. . Was just perusing eBay. Guess what I found... . Search on Recon Scout in cameras an photos! Is this the same device? So much for part 90 licensing. Jason, WA1NH
RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
I just read the FCC order.I don't see a significant threat to amateur radio UHF communications from this device. - the price is very high for what you get - few will be purchased - the technology implementation is lam - the incidents where the device would be used are few and far between - the device erp is .25watt to max 1 watt into a hand-held rubber duck antenna at the operator position and the device crawls on the ground with internal ant - the statement in the order makes the device operations secondary to amateur radio - there are many caveats in the order with regard to when the device may be used What am I missing? 73, Dave Wa3gin _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of George Henry Sent: Thursday, March 04, 2010 1:44 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band That IS the item... ReconRobotics' website has the disclaimer that the device has not received FCC authorization may not be sold.
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
What are you missing? The fact that it should be in bands where TV is authorized, and not in a band where it will be subject to random instances of interference from a service that has transmitters at any place at any time. I wonder how well a waiver would be received that would permit hams to use any frequency in the 406-512 MHz band at 1 watt maximum ERP with a non-interference basis to licensed users of that band segment. Would those licensed users sit still for that? Joe M. David Jordan wrote: I just read the FCC order…I don’t see a significant threat to amateur radio UHF communications from this device. - the price is very high for what you get – few will be purchased – the technology implementation is lam - the incidents where the device would be used are few and far between - the device erp is .25watt to max 1 watt into a hand-held rubber duck antenna at the operator position and the device crawls on the ground with internal ant - the statement in the order makes the device operations secondary to amateur radio - there are many caveats in the order with regard to when the device may be used What am I missing? 73, Dave Wa3gin *From:* Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] *On Behalf Of *George Henry *Sent:* Thursday, March 04, 2010 1:44 PM *To:* Repeater-Builder@yahoogroups.com *Subject:* Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band That IS the item... ReconRobotics' website has the disclaimer that the device has not received FCC authorization may not be sold. 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: repeater-builder-dig...@yahoogroups.com 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] Re: Fw: FCC RO Involving the Amateur 70cm Band
Joe, The last time I checked our licenses were not purchased like wireless spectrum...I believe we fall under the category of granted privileges to utilize frequency spectrum owned by the government and administrated through licenses granted by the FCC. I don't think there is any premise or as you say, ...fact that it should be in the bands where TV is authorized... is relevant. Where the FCC decides to put it is where the fact. When this waiver was posted did this group craft a response and send it to the FCC? I haven't read the ham responses but the order seems to indicate that most of the filings in opposition had to do with satellite and weak signal operations, not repeater users. Best, Dave Wa3gin -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of MCH Sent: Thursday, March 04, 2010 2:07 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band What are you missing? The fact that it should be in bands where TV is authorized, and not in a band where it will be subject to random instances of interference from a service that has transmitters at any place at any time. I wonder how well a waiver would be received that would permit hams to use any frequency in the 406-512 MHz band at 1 watt maximum ERP with a non-interference basis to licensed users of that band segment. Would those licensed users sit still for that? Joe M. David Jordan wrote: I just read the FCC order.I don't see a significant threat to amateur radio UHF communications from this device. - the price is very high for what you get - few will be purchased - the technology implementation is lam - the incidents where the device would be used are few and far between - the device erp is .25watt to max 1 watt into a hand-held rubber duck antenna at the operator position and the device crawls on the ground with internal ant - the statement in the order makes the device operations secondary to amateur radio - there are many caveats in the order with regard to when the device may be used What am I missing? 73, Dave Wa3gin *From:* Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] *On Behalf Of *George Henry *Sent:* Thursday, March 04, 2010 1:44 PM *To:* Repeater-Builder@yahoogroups.com *Subject:* Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band That IS the item... ReconRobotics' website has the disclaimer that the device has not received FCC authorization may not be sold. Yahoo! Groups Links
RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
In my view this opens the door to other encroachments on our frequency allocations. Richard www.n7tgb.net http://www.n7tgb.net/ Government's first duty is to protect the people, not run their lives. -- Ronald Reagan _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of David Jordan Sent: Thursday, March 04, 2010 10:55 AM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band I just read the FCC order.I don't see a significant threat to amateur radio UHF communications from this device. - the price is very high for what you get - few will be purchased - the technology implementation is lam - the incidents where the device would be used are few and far between - the device erp is .25watt to max 1 watt into a hand-held rubber duck antenna at the operator position and the device crawls on the ground with internal ant - the statement in the order makes the device operations secondary to amateur radio - there are many caveats in the order with regard to when the device may be used What am I missing? 73, Dave Wa3gin _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of George Henry Sent: Thursday, March 04, 2010 1:44 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band That IS the item... ReconRobotics' website has the disclaimer that the device has not received FCC authorization may not be sold.
RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Richard, The FCC has always had that option to re-assign spectrum.you use the term our frequency which implies you think we have some implied rights to utilize the spectrum. We have no rights, just privileges. The FCC can change those privileges any time they want, as they have just done in the subject case. The doors to encroachments as you say, have always been open, in fact there are no doors. We enjoy our hobby at the whim of the FCC and congress - no rights IMHO! Best, Dave Wa3gin _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Richard Sent: Thursday, March 04, 2010 2:15 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band In my view this opens the door to other encroachments on our frequency allocations.
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
The premise is common sense, but, as you say, this is the government. Where would *you* put TV transmitters if not in the TV bands? Joe M. David Jordan wrote: I don't think there is any premise or as you say, ...fact that it should be in the bands where TV is authorized... is relevant. Where the FCC decides to put it is where the fact.
Re: [Repeater-Builder] Frequency Agile Controller
Hi Joe - Thanks for the response and glad to hear that you are still active. Look forward to what you have done new. Chuck WB2EDV - Original Message - From: k3...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 7:39 AM Subject: [Repeater-Builder] Frequency Agile Controller Hello Chuck, Doug and others. I put the website some of you had referenced back on line with a new URL - www.k3jls.net. I have been doing some secondary work on using another chip - a Motorola Flash Programmable part that will work with the same radios and which will allow the storage on 100 channels with alpha tags just like today's modern FM rigs. I updated the code a couple of years ago and will be building the prototype some time this year (I hope). Time permitting, I'll also try to integrate the CTCSS function into the M/P to simplify the design. However, the primary reason for the site is to promote an automatic magnetic loop antenna controller that I built for myself and which works very well. 73's - Joe - K3JLS Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2721 - Release Date: 03/03/10 14:34:00
RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Dave, You speak exactly what I would have said here. I recall the same angst and irritation when the lower end of 220 was lost to United Parcel Service and other entities if there were any. That turned out to be much about nothing as I recall. I won't say NO ONE was using that band at the time, but NO ONE really uses it NOW. I would expect that a little investigating by someone or something that wants spectrum space, has deep pockets or a friend in Washington, could have much of that band if they wanted it. Save for a few repeaters ( like mine ) the occasional weak signal contest which has fewer and fewer users, and some uncoordinated repeater linking devices there ain't much going on up there. -Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of David Jordan Sent: Thursday, March 04, 2010 2:56 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band Richard, The FCC has always had that option to re-assign spectrum.you use the term our frequency which implies you think we have some implied rights to utilize the spectrum. We have no rights, just privileges. The FCC can change those privileges any time they want, as they have just done in the subject case. The doors to encroachments as you say, have always been open, in fact there are no doors. We enjoy our hobby at the whim of the FCC and congress - no rights IMHO! Best, Dave Wa3gin _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Richard Sent: Thursday, March 04, 2010 2:15 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band In my view this opens the door to other encroachments on our frequency allocations. __ Information from ESET NOD32 Antivirus, version of virus signature database 4916 (20100304) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 4916 (20100304) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
On 3/4/2010 1:54 PM, David Jordan wrote: I just read the FCC order.I don't see a significant threat to amateur radio UHF communications from this device. It's operating on a ham band at more than flea power-maybe as much as several watts. How can it NOT interfere? Trust me, it WILL! It defies the laws of physics to generate RF on a frequency without interfering with others on the same frequency within the area.
RE: [Repeater-Builder] Re: Interference
The repeater consists of (2)Motorola Pro 5100 Radios, one in transmit, and one in receive, the controller is a CAT 250, the duplexer is a Wacom 641, the Antenna is a DB 224E, and it is powered by an Astron 50 Amp supply. Hope this helps. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of DCFluX Sent: Friday, March 05, 2010 2:08 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Interference Please provide make and model of repeater, controller, duplexer and input frequency.
RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Joe, I'd put them in the Licensed Public Safety Broad Band Data allocation 4940-4980Mhz band.plenty of room there.very little usage. My guess is the manufacturer doesn't have the technology or funding needed to build the cheaply made, significantly over priced crawling camera to operate in the GHz ranges. Like BPL.this vendor will disappear once their venture capital has been all used up. The military may purchase some of these units but with tax revenues down nationally, for the next several years, I don't think your local fire or police dept will be spending many dollars on this low value technology. I'm not worried about this order. Best, dave _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of MCH Sent: Thursday, March 04, 2010 2:42 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band The premise is common sense, but, as you say, this is the government. Where would *you* put TV transmitters if not in the TV bands? Joe M. David Jordan wrote: I don't think there is any premise or as you say, ...fact that it should be in the bands where TV is authorized... is relevant. Where the FCC decides to put it is where the fact.
RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
I'm an HFer.Interference doesn't bother me ;-) _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of wd8chl Sent: Thursday, March 04, 2010 2:53 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band On 3/4/2010 1:54 PM, David Jordan wrote: I just read the FCC order.I don't see a significant threat to amateur radio UHF communications from this device. It's operating on a ham band at more than flea power-maybe as much as several watts. How can it NOT interfere? Trust me, it WILL! It defies the laws of physics to generate RF on a frequency without interfering with others on the same frequency within the area.
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Mike, I beg to differ with you.. at least here in the NE 220 is heavily used for packet network linking between NY, NJ, CT, and MA. Dave WB2FTX - Original Message - From: Michael Ryan To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 3:15 PM Subject: RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band Dave, You speak exactly what I would have said here. I recall the same angst and irritation when the lower end of 220 was lost to United Parcel Service and other entities if there were any. That turned out to be much about nothing as I recall. I won't say NO ONE was using that band at the time, but NO ONE really uses it NOW. I would expect that a little investigating by someone or something that wants spectrum space, has deep pockets or a friend in Washington, could have much of that band if they wanted it. Save for a few repeaters ( like mine ) the occasional weak signal contest which has fewer and fewer users, and some uncoordinated repeater linking devices there ain't much going on up there. -Mike From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of David Jordan Sent: Thursday, March 04, 2010 2:56 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band Richard, The FCC has always had that option to re-assign spectrum.you use the term our frequency which implies you think we have some implied rights to utilize the spectrum. We have no rights, just privileges. The FCC can change those privileges any time they want, as they have just done in the subject case. The doors to encroachments as you say, have always been open, in fact there are no doors. We enjoy our hobby at the whim of the FCC and congress - no rights IMHO! Best, Dave Wa3gin -- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Richard Sent: Thursday, March 04, 2010 2:15 PM To: Repeater-Builder@yahoogroups.com Subject: RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band In my view this opens the door to other encroachments on our frequency allocations. __ Information from ESET NOD32 Antivirus, version of virus signature database 4916 (20100304) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 4916 (20100304) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __ Information from ESET NOD32 Antivirus, version of virus signature database 4916 (20100304) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2721 - Release Date: 03/03/10 14:34:00
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
2.4 GHz, there are numorous TV transmitters already designed that operate here, 2 of the 4 channels common channels fall on the ham band and are often converted for ATV use. On Thu, Mar 4, 2010 at 12:42 PM, MCH m...@nb.net wrote: The premise is common sense, but, as you say, this is the government. Where would *you* put TV transmitters if not in the TV bands? Joe M. David Jordan wrote: I don't think there is any premise or as you say, ...fact that it should be in the bands where TV is authorized... is relevant. Where the FCC decides to put it is where the fact. Yahoo! Groups Links
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
It suffices to say there are lots of good answers, and none of them are the 440 band. And, there is obviously existing spectrum for these devices, so their waiver should have never been granted. As far as the eBay auction, there ARE legal users of these devices - US! (hams) I can see it now - Live from Dayton... the Hamvention Robot. Joe M. DCFluX wrote: 2.4 GHz, there are numorous TV transmitters already designed that operate here, 2 of the 4 channels common channels fall on the ham band and are often converted for ATV use. On Thu, Mar 4, 2010 at 12:42 PM, MCH m...@nb.net wrote: The premise is common sense, but, as you say, this is the government. Where would *you* put TV transmitters if not in the TV bands? Joe M. David Jordan wrote: I don't think there is any premise or as you say, ...fact that it should be in the bands where TV is authorized... is relevant. Where the FCC decides to put it is where the fact. Yahoo! Groups Links Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2721 - Release Date: 03/03/10 14:34:00
Re: [Repeater-Builder] Re: Interference
PRO5100 = 44.85 MHz 1st IF with High Side Injection, 455kHz 2nd IF, 16.8 MHz TCXO What is the frequency of the repeaters transmitter? On Thu, Mar 4, 2010 at 12:48 PM, Leroy A. M. Baptiste leroybapti...@spiceisle.com wrote: The repeater consists of (2)Motorola Pro 5100 Radios, one in transmit, and one in receive, the controller is a CAT 250, the duplexer is a Wacom 641, the Antenna is a DB 224E, and it is powered by an Astron 50 Amp supply. Hope this helps. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of DCFluX Sent: Friday, March 05, 2010 2:08 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Interference Please provide make and model of repeater, controller, duplexer and input frequency. Yahoo! Groups Links
RE: [Repeater-Builder] Re: Interference
146.760 Mhz. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of DCFluX Sent: Friday, March 05, 2010 5:54 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Interference PRO5100 = 44.85 MHz 1st IF with High Side Injection, 455kHz 2nd IF, 16.8 MHz TCXO What is the frequency of the repeaters transmitter? On Thu, Mar 4, 2010 at 12:48 PM, Leroy A. M. Baptiste leroybapti...@spiceisle.com mailto:leroybaptiste%40spiceisle.com wrote: The repeater consists of (2)Motorola Pro 5100 Radios, one in transmit, and one in receive, the controller is a CAT 250, the duplexer is a Wacom 641, the Antenna is a DB 224E, and it is powered by an Astron 50 Amp supply. Hope this helps. -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 DCFluX Sent: Friday, March 05, 2010 2:08 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Re: Interference Please provide make and model of repeater, controller, duplexer and input frequency. Yahoo! Groups Links
[Repeater-Builder] RDA RLC to Mastr III
I am trying to wire 6 RDA RLC's to 6 800 Mhz conventional Mastr III's. Anyone have any experience in this field? Thanks! Norm
RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
On Thu, 4 Mar 2010, David Jordan wrote: My guess is the manufacturer doesn?t have the technology or funding needed to build the cheaply made, significantly over priced crawling camera to operate in the GHz ranges. My bet is that the manufacturer got a deal on some 433MHz camera modules from China. Like BPL?this vendor will disappear once their venture capital has been all used up. The military may purchase some of these units but with tax revenues down nationally, for the next several years, I don?t think your local fire or police dept will be spending many dollars on this low value technology? Doesn't matter; the legal world is ruled by precedents. This sets an unhealthy one. And NTIA/Military has spoken up on the matter -- did you see the section in the order where the device would not be operated within so many miles of several AFBs, which are known to house PAVE-PAWS installations? -- Kris Kirby, KE4AHR Disinformation Analyst
[Repeater-Builder] Correction...
Those are IDA RLC's to Mastr III's. My bad. Norm
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Sorry, I don't recognize the language you are using to refer to the current topic. The FCC doesn't need a precedent to adjust it's regulatory perspective or inclination. If the FCC wants to cancel all amateur licenses and give the spectrum to GE for some energy saving RF transmission technology they will do so. The 300,000,000 people of the nation won't blink an eye. So, enjoy what you have, it is a priviledge and nothing more. I wouldn't waste a nanosecond worrying about precedent. Best, dave wa3gin - Original Message - From: Kris Kirby To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 4:45 PM Subject: RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band On Thu, 4 Mar 2010, David Jordan wrote: My guess is the manufacturer doesn?t have the technology or funding needed to build the cheaply made, significantly over priced crawling camera to operate in the GHz ranges. My bet is that the manufacturer got a deal on some 433MHz camera modules from China. Like BPL?this vendor will disappear once their venture capital has been all used up. The military may purchase some of these units but with tax revenues down nationally, for the next several years, I don?t think your local fire or police dept will be spending many dollars on this low value technology? Doesn't matter; the legal world is ruled by precedents. This sets an unhealthy one. And NTIA/Military has spoken up on the matter -- did you see the section in the order where the device would not be operated within so many miles of several AFBs, which are known to house PAVE-PAWS installations? -- Kris Kirby, KE4AHR Disinformation Analyst
Re: [Repeater-Builder] Re: Interference
About the only IMD product I can come up with is this one 16.8 + (8 x 146.76) - (6 x 191.01) = 44.82 MHz Which is the TCXO + 8th harmonic of TX - 6th harmonic of RX VCO to land close to the 1st IF pass band. I think the lack of filtration in this model of radio might be suspect as it uses varactor tuned strip lines. The probably offer minimal selectivity and they might not be optimized for ham band as they are voltage controlled and the radio might not be optimized for this frequency (it will program but moto cant guarantee the specifications). I'd try the notch coax stub as on your feedline as someone else suggested. On Thu, Mar 4, 2010 at 2:56 PM, Leroy A. M. Baptiste leroybapti...@spiceisle.com wrote: 146.760 Mhz. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of DCFluX Sent: Friday, March 05, 2010 5:54 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Interference PRO5100 = 44.85 MHz 1st IF with High Side Injection, 455kHz 2nd IF, 16.8 MHz TCXO What is the frequency of the repeaters transmitter? On Thu, Mar 4, 2010 at 12:48 PM, Leroy A. M. Baptiste leroybapti...@spiceisle.com mailto:leroybaptiste%40spiceisle.com wrote: The repeater consists of (2)Motorola Pro 5100 Radios, one in transmit, and one in receive, the controller is a CAT 250, the duplexer is a Wacom 641, the Antenna is a DB 224E, and it is powered by an Astron 50 Amp supply. Hope this helps. -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 DCFluX Sent: Friday, March 05, 2010 2:08 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Re: Interference Please provide make and model of repeater, controller, duplexer and input frequency. Yahoo! Groups Links Yahoo! Groups Links
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
On 3/4/2010 11:54 AM, David Jordan wrote: What am I missing? That there are other bands specifically set aside for this business purpose, perhaps? :-) Nate WY0X
Re: [Repeater-Builder] Interference
Is it IMD, though? Could it be in the audio chain? Leroy, did you troubleshoot from this angle? On Thu, Mar 4, 2010 at 12:53 PM, Leroy A. M. Baptiste leroybapti...@spiceisle.com wrote: Yes, they are. -Original Message- From: Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com [mailto:Repeater-Builder@yahoogroups.comRepeater-Builder%40yahoogroups.com] On Behalf Of Larry Horlick Sent: Friday, March 05, 2010 1:36 AM To: Repeater-Builder@yahoogroups.com Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Interference The 2m repeater and FM transmitter are at the same site? lh On Thu, Mar 4, 2010 at 8:56 AM, Leroy A. M. Baptiste leroybapti...@spiceisle.com leroybaptiste%40spiceisle.com mailto:leroybapti...@spiceisle.com leroybaptiste%40spiceisle.com wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
On 3/4/2010 1:58 PM, David Jordan wrote: I'm an HFer...Interference doesn't bother me ;-) We'll notify your local power company that they can fire up BPL on your block, effective immediately. :-) (GRIN!) Nate WY0X
[Repeater-Builder] Super-band TV Transmitters
If there are any TV engineers on here who have or have maintained a VHF superband transmitter (174-210MHz), please email me. I have some questions, and wonder if you still have schematics. -- Kris Kirby, KE4AHR Disinformation Analyst
Re: [Repeater-Builder] Interference
Pardon me for butting in again. Start with the simple things like taking the aerial off the rptr rx and see if that cures it. How far apart are the FM and rptr aerials, as it sounds like pure rf getting into the rx. Is the duplexer tuned right to give around 80db isolation as it maybe the rptrs own tx causing probs allthough he did say taking the FM,s aerial off cured it. Still recon my idea of a coax notch filter in the rx input will cure it. Steve - Original Message - From: Larry Horlick To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 11:33 PM Subject: Re: [Repeater-Builder] Interference Is it IMD, though? Could it be in the audio chain? Leroy, did you troubleshoot from this angle? On Thu, Mar 4, 2010 at 12:53 PM, Leroy A. M. Baptiste leroybapti...@spiceisle.com wrote: Yes, they are. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Larry Horlick Sent: Friday, March 05, 2010 1:36 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Interference The 2m repeater and FM transmitter are at the same site? lh On Thu, Mar 4, 2010 at 8:56 AM, Leroy A. M. Baptiste leroybapti...@spiceisle.com mailto:leroybapti...@spiceisle.com wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
At 3/4/2010 13:45, you wrote: It suffices to say there are lots of good answers, and none of them are the 440 band. And, there is obviously existing spectrum for these devices, so their waiver should have never been granted. As far as the eBay auction, there ARE legal users of these devices - US! (hams) I can see it now - Live from Dayton... the Hamvention Robot. For the price of a Recon Scout, I could've bought 2 10 kW AM broadcast transmitters at last year's Dayton. Or was it a 3 kW transmitter for $10k? Bob NO6B
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
HA, They did install BPL near by in Manassas, VA I went there sniffing for RFI and I never heard anything -- drove all over the route -- they went belly up in about 2 yrs. - Original Message - From: Nate Duehr To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 6:18 PM Subject: Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band On 3/4/2010 1:58 PM, David Jordan wrote: I'm an HFer.Interference doesn't bother me ;-) We'll notify your local power company that they can fire up BPL on your block, effective immediately. :-) (GRIN!) Nate WY0X
[Repeater-Builder] Re: Interference
Leroy, perhaps you answered my questions from earlier today and I missed your answers. If you answered I apologize. So here they are again. --- In Repeater-Builder@yahoogroups.com, Leroy A. M. Baptiste leroybaptiste@ wrote: When you key up the repeater, and you release, the repeater is held open (Sometimes) What do you mean by held open? Is the interference opening/keeping open the squelch of the repeater receiver, or are you hearing it with the squelch closed during the TX tail? , and you can hear the interference coming in. Is the interference audio relatively clean/undistorted, or loud, raspy, distorted? Is the interference always there, or quite intermittent? Laryn K8TVZ
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Not to mention the local CB'ers running a killowatt near your home! LOL! Don, KD9PT - Original Message - From: Nate Duehr To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 5:18 PM Subject: Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band On 3/4/2010 1:58 PM, David Jordan wrote: I'm an HFer.Interference doesn't bother me ;-) We'll notify your local power company that they can fire up BPL on your block, effective immediately. :-) (GRIN!) Nate WY0X
Re: [Repeater-Builder] Interference
I'm thinking the same thing, audio chain. I would be surprised if the 5KHz deviation receiver could recover much audio from a wide band FM broadcast station. If the FM station is audio on the 2 meter receiver is very clear, I would say audio chain like you are stating. Joe Larry Horlick wrote: Is it IMD, though? Could it be in the audio chain? Leroy, did you troubleshoot from this angle? 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: repeater-builder-dig...@yahoogroups.com 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] Re: Fw: FCC RO Involving the Amateur 70cm Band
At 3/4/2010 13:45, you wrote: Doesn't matter; the legal world is ruled by precedents. This sets an unhealthy one. And NTIA/Military has spoken up on the matter -- did you see the section in the order where the device would not be operated within so many miles of several AFBs, which are known to house PAVE-PAWS installations? Finally, someone actually read the RO! Actually, I believe it said no training exercises within 30 km of the AFBs. In actual scene use it can be used anywhere. Now, see the channel assignments for the analog video? Since the video carrier is 1.25 MHz above the bottom of each channel, we can predict where most of the energy is going to fall: 437.25, 443.25 431.25, in descending order of occupancy. If your input isn't near one of those frequencies, you're probably never going to hear from one. The real problem will be us interfering with the Scout RX. Bob NO6B
[Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Laryn and others, Here is the link to the RO #08-63 . Please notice the dates on this-it was in 2008... I do not think that the FCC should grant this at all, but we need to let our representatives know both at the ARRL, FCC and senators/congresscritters know that we find this encroachment unacceptable. Maybe they should take over UPS's claim on the 220 band... Phil KK6PE http://fjallfoss.fcc.gov/edocs_public/attachmatch/DA-08-1077A1.txt --- In Repeater-Builder@yahoogroups.com, larynl2 lar...@... wrote: Anyone have a real link to this? Those of us on the Web do not get attachments... Laryn K8TVZ
RE: [Repeater-Builder] Interference
Hi Steve, thanks for taking time out to help me solve this problem. I will try taking the aerial of the repeater RX to see what happens. The distance between antennas is about 20 feet. The FM antenna is circularly polarised, and the @ Meter is a DB224E with all diploes in line. Taking the FM transmitter off the air solved the problem. Re the duplexers they were tuned with a spectrum analyzer, the repeater receives signals as far away as 100 odd miles. I think it has been conclusively proved that the interference is coming from the FM transmitter. But I will make some more checks and see what happens, I will post my results. Thanks again guys. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of Steve Sent: Friday, March 05, 2010 8:14 AM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Interference Pardon me for butting in again. Start with the simple things like taking the aerial off the rptr rx and see if that cures it. How far apart are the FM and rptr aerials, as it sounds like pure rf getting into the rx. Is the duplexer tuned right to give around 80db isolation as it maybe the rptrs own tx causing probs allthough he did say taking the FM,s aerial off cured it. Still recon my idea of a coax notch filter in the rx input will cure it. Steve - Original Message - From: Larry Horlick mailto:llhorl...@gmail.com To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 11:33 PM Subject: Re: [Repeater-Builder] Interference Is it IMD, though? Could it be in the audio chain? Leroy, did you troubleshoot from this angle? On Thu, Mar 4, 2010 at 12:53 PM, Leroy A. M. Baptiste leroybapti...@spiceisle.com mailto:leroybapti...@spiceisle.com wrote: Yes, they are. -Original Message- From: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com [mailto:Repeater-Builder@yahoogroups.com mailto:Repeater-Builder@yahoogroups.com ] On Behalf Of Larry Horlick Sent: Friday, March 05, 2010 1:36 AM To: Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com Subject: Re: [Repeater-Builder] Interference The 2m repeater and FM transmitter are at the same site? lh On Thu, Mar 4, 2010 at 8:56 AM, Leroy A. M. Baptiste leroybapti...@spiceisle.com mailto:leroybaptiste%40spiceisle.com mailto:leroybapti...@spiceisle.com mailto:leroybaptiste%40spiceisle.com wrote: Hello all, I am having some interference problems, it is coming from an FM transmitter on 94.500MHz, and getting into the Amateur Radio repeater's receiver on 146.1600MHz. It is not there all the time, but when the repeater is keyed up, you can hear it getting in. The 2 Meter repeater is fed with heliax cable from the duplexer to the antenna, the transmission line on the FM station is ordinary coaxial cable, the power output is about 300 Watts, any ideas? Leroy. J39AI
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Until they start bringing up ATV repeaters, The common input frequencies are 439.25, 434.0, 433.25, 427.25 and 421.25. Now, see the channel assignments for the analog video? Since the video carrier is 1.25 MHz above the bottom of each channel, we can predict where most of the energy is going to fall: 437.25, 443.25 431.25, in descending order of occupancy. If your input isn't near one of those frequencies, you're probably never going to hear from one. The real problem will be us interfering with the Scout RX. Bob NO6B Yahoo! Groups Links
RE: [Repeater-Builder] Re: Interference
Hi Laryn, no I did not get a chance to answer your questions, but here goes. The interference is holding the squelch open on the repeater receiver sometimes, which by extension holds the transmitter on, or cycles it, based on the interference into the receiver. The interference audio is not clean, it is distorted, the interference is not always there when you key up. Like I mentioned before, turning the FM transmitter off cures the problem. Hope that helps, and many thanks for your help. -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of larynl2 Sent: Friday, March 05, 2010 9:19 AM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Interference Leroy, perhaps you answered my questions from earlier today and I missed your answers. If you answered I apologize. So here they are again. --- In Repeater-Builder@yahoogroups.com mailto:Repeater-Builder%40yahoogroups.com , Leroy A. M. Baptiste leroybaptiste@ wrote: When you key up the repeater, and you release, the repeater is held open (Sometimes) What do you mean by held open? Is the interference opening/keeping open the squelch of the repeater receiver, or are you hearing it with the squelch closed during the TX tail? , and you can hear the interference coming in. Is the interference audio relatively clean/undistorted, or loud, raspy, distorted? Is the interference always there, or quite intermittent? Laryn K8TVZ
Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Regarding the orginal RO, does anyone have access to the comments that were received by the FCC on this proposal? Did the ARRL comment on it? Dave WB2FTX - Original Message - From: kg6ziu To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 6:49 PM Subject: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band Laryn and others, Here is the link to the RO #08-63 . Please notice the dates on this-it was in 2008... I do not think that the FCC should grant this at all, but we need to let our representatives know both at the ARRL, FCC and senators/congresscritters know that we find this encroachment unacceptable. Maybe they should take over UPS's claim on the 220 band... Phil KK6PE http://fjallfoss.fcc.gov/edocs_public/attachmatch/DA-08-1077A1.txt --- In Repeater-Builder@yahoogroups.com, larynl2 lar...@... wrote: Anyone have a real link to this? Those of us on the Web do not get attachments... Laryn K8TVZ -- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2722 - Release Date: 03/04/10 14:34:00
[Repeater-Builder] With your $1.00 donation, receive a chance to win a Gift card from Wal Mart valu
With your $1.00 donation, receive a chance to win a Gift card from Wal Mart valued at $150.00 to spend, spend spend! With your $1.00 donation, receive a chance to win a Gift card from Wal Mart valued at $150.00 to spend, spend spend! Not bad for a buck? Help support Amateur Radio in Central New York and help us get our Repeater back up in the air! Drawing to be held April 06, 2010 at 8:00 p.m. at the Marcy Town Hall in Marcy New York - Winner need not be present to win, but you are welcome to join us! To donate securely by Pay-Pal and further details go to www.CNYARA.com The CNYARA thanks you for your support. Also, drop by on the 147.240 KA2FWN/R (+) pl 71.9 (independently co- sponsored by KA2FWN, K1DCC KB2AUJ) for your morning drive into work Monday through Friday starting at 8:00 am on The First Cup Net. The Hams that sponsor this repeater have allowed the CNYARA to bring back our morning net until our Repeater goes back On-the-Air later this month and we sincerely thank them for their kindness and lending a hand. We operate the Net every weekday for weather events, road hazards reports, and just to keep you company on the ride into work. Stop in and give us your report, comments or to say hello. The KA2FWN/R is located on Prospect Hill in Kirkland, NY and can see very well in all directions. Mobile stations and stations on short time have precedence, but we welcome ALL. Thanks again from the CNYARA!
[Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
Dave, I was looking for it on the FCC website, and I saw nothing. Would be very interesting reading. I would also enjoy reading of the internal docs at ReconRobotics. Phil KK6PE --- In Repeater-Builder@yahoogroups.com, David Struebel wb2...@... wrote: Regarding the orginal RO, does anyone have access to the comments that were received by the FCC on this proposal? Did the ARRL comment on it? Dave WB2FTX
RE: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band
I believe the ARRL did. I posted the link to it in an earlier message. Richard www.n7tgb.net http://www.n7tgb.net/ Government's first duty is to protect the people, not run their lives. -- Ronald Reagan _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of David Struebel Sent: Thursday, March 04, 2010 7:31 PM To: Repeater-Builder@yahoogroups.com Subject: Re: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band Regarding the orginal RO, does anyone have access to the comments that were received by the FCC on this proposal? Did the ARRL comment on it? Dave WB2FTX - Original Message - From: kg6ziu mailto:ehr...@charter.net To: Repeater-Builder@ mailto:Repeater-Builder@yahoogroups.com yahoogroups.com Sent: Thursday, March 04, 2010 6:49 PM Subject: [Repeater-Builder] Re: Fw: FCC RO Involving the Amateur 70cm Band Laryn and others, Here is the link to the RO #08-63 . Please notice the dates on this-it was in 2008... I do not think that the FCC should grant this at all, but we need to let our representatives know both at the ARRL, FCC and senators/congresscritters know that we find this encroachment unacceptable. Maybe they should take over UPS's claim on the 220 band... Phil KK6PE http://fjallfoss. http://fjallfoss.fcc.gov/edocs_public/attachmatch/DA-08-1077A1.txt fcc.gov/edocs_public/attachmatch/DA-08-1077A1.txt --- In Repeater-Builder@ mailto:Repeater-Builder%40yahoogroups.com yahoogroups.com, larynl2 lar...@... wrote: Anyone have a real link to this? Those of us on the Web do not get attachments... Laryn K8TVZ _ No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2722 - Release Date: 03/04/10 14:34:00
Re: [Repeater-Builder] Super-band TV Transmitters
I think that's called high band VHF, channel 7 to 12. Anyway missed by 1, my son works where they just took channel 6 off the air. Gerald WD0FYF - Original Message - From: Kris Kirby k...@catonic.us To: Repeater-Builder@yahoogroups.com Sent: Thursday, March 04, 2010 5:23 PM Subject: [Repeater-Builder] Super-band TV Transmitters If there are any TV engineers on here who have or have maintained a VHF superband transmitter (174-210MHz), please email me. I have some questions, and wonder if you still have schematics. -- Kris Kirby, KE4AHR Disinformation Analyst Yahoo! Groups Links
[Repeater-Builder] With your $1.00 donation, receive a chance to win a Gift card from Wal Mart.
With your $1.00 donation, receive a chance to win a Gift card from Wal Mart valued at $150.00 to spend, spend spend! Not bad for a buck? Help support Amateur Radio in Central New York and help us get our Repeater back up in the air! Drawing to be held April 06, 2010 at 8:00 p.m. at the Marcy Town Hall in Marcy New York - Winner need not be present to win, but you are welcome to join us! To donate securely by Pay-Pal and further details go to www.CNYARA.com The CNYARA thanks you for your support. Also, drop by on the 147.240 KA2FWN/R (+) pl 71.9 (independently co- sponsored by KA2FWN, K1DCC KB2AUJ) for your morning drive into work Monday through Friday starting at 8:00 am on The First Cup Net. The Hams that sponsor this repeater have allowed the CNYARA to bring back our morning net until our Repeater goes back On-the-Air later this month and we sincerely thank them for their kindness and lending a hand. We operate the Net every weekday for weather events, road hazards reports, and just to keep you company on the ride into work. Stop in and give us your report, comments or to say hello. The KA2FWN/R is located on Prospect Hill in Kirkland, NY and can see very well in all directions. Mobile stations and stations on short time have precedence, but we welcome ALL. Thanks again from the CNYARA!
RE: [Repeater-Builder] Re: Interference
Hi Leroy, Sounds like its coming straight into the antenna connector on rx since you mentioned it keeps the repeater keyed. If I'm not mistaken you also mentioned it cycles w/repeater tx? I'm guessing this is a commercial site with other systems in addition to your machine and the FM broadcast transmitters? The WP-641 duplexer you're using is a great duplexer, but doesn't offer much protection beyond the specific pass-reject frequencies its tuned for. Have you ever tried a different receiver on your system? It'd be interesting to connect another (high quality) receiver in place of what you have now as a test. Or try adding a bandpass cavity between rx and duplexer. Another pass cavity and/or isolator on the tx side might be a big help too. Dan k8plw --- On Thu, 3/4/10, Leroy A. M. Baptiste leroybapti...@spiceisle.com wrote: From: Leroy A. M. Baptiste leroybapti...@spiceisle.com Subject: RE: [Repeater-Builder] Re: Interference To: Repeater-Builder@yahoogroups.com Date: Thursday, March 4, 2010, 8:44 PM Hi Laryn, no I did not get a chance to answer your questions, but here goes. The interference is holding the squelch open on the repeater receiver sometimes, which by extension holds the transmitter on, or cycles it, based on the interference into the receiver. The interference audio is not clean, it is distorted, the interference is not always there when you key up. Like I mentioned before, turning the FM transmitter off cures the problem. Hope that helps, and many thanks for your help. -Original Message- From: Repeater-Builder@ yahoogroups. com [mailto:Repeater-Builder@ yahoogroups. com] On Behalf Of larynl2 Sent: Friday, March 05, 2010 9:19 AM To: Repeater-Builder@ yahoogroups. com Subject: [Repeater-Builder] Re: Interference Leroy, perhaps you answered my questions from earlier today and I missed your answers. If you answered I apologize. So here they are again. --- In Repeater-Builder@ yahoogroups. com mailto:Repeater- Builder%40yahoog roups.com , Leroy A. M. Baptiste leroybaptiste@ wrote: When you key up the repeater, and you release, the repeater is held open (Sometimes) What do you mean by held open? Is the interference opening/keeping open the squelch of the repeater receiver, or are you hearing it with the squelch closed during the TX tail? , and you can hear the interference coming in. Is the interference audio relatively clean/undistorted, or loud, raspy, distorted? Is the interference always there, or quite intermittent? Laryn K8TVZ
[Repeater-Builder] Re: Interference
--- In Repeater-Builder@yahoogroups.com, Leroy A. M. Baptiste leroybapti...@... wrote: Hi Laryn, no I did not get a chance to answer your questions, but here goes. The interference is holding the squelch open on the repeater receiver sometimes, which by extension holds the transmitter on, or cycles it, based on the interference into the receiver. OK, this tells me that the interference is indeed getting into the receiver, not RF getting into the controller, or some other audio stages, for example. The interference audio is not clean, it is distorted, the interference is not always there when you key up. This sounds like it is the wideband (75 kc. deviation) FM signal getting into the receiver. Audio at that deviation will be VERY distorted, if heard at all. That's because it's so wide that there's little energy within your receiver's IF bandwidth much of the time. Like I mentioned before, turning the FM transmitter off cures the problem. Hope that helps, and many thanks for your help. I haven't done any math on your numbers. There are several ways that the FM station's signal may be mixing somewhere with your transmitter, or even a third carrier may be involved in the mix. Locally, we have stations on 89.3 and 89.9, both mixing with our repeater output, to produce an intermod signal on our input. Like your symptoms, the signal was intermittent. Because two FM stations were involved, we had no noticeable interference until BOTH stations were transmitting very low, or no, audio. Such as spaces between words etc. Anything near normal deviation levels on either station would instantly close the receiver squelch and the problem was gone, for practical purposes. I found where the mixing was occurring with the aid of a spectrum analyzer, fed with a hand held beam. Guy wire turnbuckle weave wires were causing the mixing. I insulated them and problem is gone. Hope this helps. Good luck. Laryn K8TVZ
