RE: [Repeater-Builder] RF Tilt Compensator Schematic?
Matt, Which way do you want to tilt it? To compensate for cable that precedes it? Does it have to be for 50 ohms, or will 75 be okay? How much power does it need to handle? Kevin Matt, Which way do you want to tilt it? To compensate for cable that precedes it? Does it have to be for 50 ohms, or will 75 be okay? How much power does it need to handle? Kevin --- Original Message --- >From : DCFluX[mailto:[EMAIL PROTECTED]] Sent : 11/8/2005 6:33:36 PM To : Repeater-Builder@yahoogroups.com Cc : Subject : RE: [Repeater-Builder] RF Tilt Compensator Schematic? Any one have any ideas on how to build a Tilt-Compensator? I had come ideas about using a pre-emphasis circuit, but that is designed for audio frequencies and I need something for 50-550 MHz. Preferably with a slope adjustment so it can contend with varying lengths of cable. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] RF Tilt Compensator Schematic?
It is 75 Ohm cable, Paticualrly RG-6 Plenum which has approx 1dB of Tilt per Octave at 100'. Maximum power is +25dBmV. Intersted in attenuating the lower channels more than the upper ones, and I will follow it with an amp on each floor after it is compensated. Some genius company, that is used to installing security systems in Las Vegas ran the cable in this building and thought that a single amplifier would cover the entire building. Which is scary because the company had the $4000 piece of test equipment to tell them how screwed up their install was. Up on the third floor I measured 50dB of tilt between Ch.2 and Ch.77On 11/12/05, Kevin Custer [EMAIL PROTECTED] wrote: Matt, Which way do you want to tilt it? To compensate for cable that precedes it? Does it have to be for 50 ohms, or will 75 be okay? How much power does it need to handle? Kevin Matt, Which way do you want to tilt it? To compensate for cable that precedes it? Does it have to be for 50 ohms, or will 75 be okay? How much power does it need to handle? Kevin --- Original Message --- >From : DCFluX[mailto:[EMAIL PROTECTED]] Sent : 11/8/2005 6:33:36 PM To : Repeater-Builder@yahoogroups.com Cc : Subject : RE: [Repeater-Builder] RF Tilt Compensator Schematic? Any one have any ideas on how to build a Tilt-Compensator? I had come ideas about using a pre-emphasis circuit, but that is designed for audio frequencies and I need something for 50-550 MHz. Preferably with a slope adjustment so it can contend with varying lengths of cable. YAHOO! GROUPS LINKS Visit your group Repeater-Builder on the web. To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Re: [Repeater-Builder] RF Tilt Compensator Schematic?
Just buy the tilt compensator or an amp that has one internal. Try Toner cable equipment and Quality RF services, those are two companies I remeber dealing with, there are several more. Paul kb9wlc --- DCFluX [EMAIL PROTECTED] wrote: It is 75 Ohm cable, Paticualrly RG-6 Plenum which has approx 1dB of Tilt per Octave at 100'. Maximum power is +25dBmV. Intersted in attenuating the lower channels more than the upper ones, and I will follow it with an amp on each floor after it is compensated. Some genius company, that is used to installing security systems in Las Vegas ran the cable in this building and thought that a single amplifier would cover the entire building. Which is scary because the company had the $4000 piece of test equipment to tell them how screwed up their install was. Up on the third floor I measured 50dB of tilt between Ch.2 and Ch.77 On 11/12/05, Kevin Custer [EMAIL PROTECTED] wrote: Matt, Which way do you want to tilt it? To compensate for cable that precedes it? Does it have to be for 50 ohms, or will 75 be okay? How much power does it need to handle? Kevin Matt, Which way do you want to tilt it? To compensate for cable that precedes it? Does it have to be for 50 ohms, or will 75 be okay? How much power does it need to handle? Kevin --- Original Message --- From : DCFluX[mailto:[EMAIL PROTECTED] [EMAIL PROTECTED]] Sent : 11/8/2005 6:33:36 PM To : Repeater-Builder@yahoogroups.com Cc : Subject : RE: [Repeater-Builder] RF Tilt Compensator Schematic? Any one have any ideas on how to build a Tilt-Compensator? I had come ideas about using a pre-emphasis circuit, but that is designed for audio frequencies and I need something for 50-550 MHz. Preferably with a slope adjustment so it can contend with varying lengths of cable. -- YAHOO! GROUPS LINKS - Visit your group Repeater-Builderhttp://groups.yahoo.com/group/Repeater-Builder on the web. - To unsubscribe from this group, send an email to: [EMAIL PROTECTED][EMAIL PROTECTED] - Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service http://docs.yahoo.com/info/terms/. -- __ Yahoo! FareChase: Search multiple travel sites in one click. http://farechase.yahoo.com Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] RF Tilt Compensator Schematic?
DCFluX wrote: It is 75 Ohm cable, Paticualrly RG-6 Plenum which has approx 1dB of Tilt per Octave at 100'. Maximum power is +25dBmV. Intersted in attenuating the lower channels more than the upper ones, and I will follow it with an amp on each floor after it is compensated. The device you are looking for is simply called a forward equalizer. In CATV, the equalizer compensates for cable tilt induced ahead of an amplifier. If the amplifier that has been deployed has a Tilt or Slope control, turn it so the lower channels are running out lower. This is called positive tilt. Commonly, 6 to 12 dB of tilt is added at each amplifier location. Even with the application of positive tilt at each amplifier, it is not uncommon that the signal at the back of the set is reverse tilted to some degree. The sweet spot for most sets is 0 to 8 dB across the board, but the lower channels are typically much higher due to cable tilt. You should strive for no less than 0 dB on the high channel, and no more than 20 dB on any other; measured at the back of the set. Some genius company, that is used to installing security systems in Las Vegas ran the cable in this building and thought that a single amplifier would cover the entire building. Which is scary because the company had the $4000 piece of test equipment to tell them how screwed up their install was. That piece might have been a Wavetek Stealth 3SR (older) or Acterna SDA-5000 (newer vintage of same piece). My SDA has all of the digital and return (reverse) capabilities and also has transmit capabilities for sweep or loopback sweep, and was $8200.00 3 years ago, as the base cost is around $4K. Up on the third floor I measured 50dB of tilt between Ch.2 and Ch.77 50 dB of tilt indicates something very wrong. Here are some links to help: http://www.shol.com/kuggie/cttip/padsandeqs.html http://www.cabl.com/restaurant/formula.html#tilteq http://www.tinlee.com/TV_Signal_Distibution.htm#Line%20Equalizers%20(Tilt%20Attenuators) http://www.acterna.com/global/products/descriptions/SDA-5000/ Good luck, Kevin Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ * To unsubscribe from this group, send an email to: [EMAIL PROTECTED] * Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] RF Tilt Compensator Schematic?
Any one have any ideas on how to build a Tilt-Compensator? I had come ideas about using a pre-emphasis circuit, but that is designed for audio frequencies and I need something for 50-550 MHz. Preferably with a slope adjustment so it can contend with varying lengths of cable. YAHOO! GROUPS LINKS Visit your group "Repeater-Builder" on the web. To unsubscribe from this group, send an email to:[EMAIL PROTECTED] Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
