Antenna Coax
Coax cable from roof antenna to new hdtv?
Here’s the deal – buying a new lcd hdtv to replace old analog. This is in a motorhome. Roof antenna has coax cable running to old tv. What do I need to do get high def signal to my new tv. Will the old coax work? I’m not able to tear out all the coax cable from the antenna to the new tv and replace it with hdmi cable, so that’s out of the question. Can I attach the coax to hdmi cable behind the tv or is there a box that will do the job?
The old coax might work well enough. Take a look at its general condition and see if you can see printing on the side, which would say RG6 or RG59. RG6 is much better but many years ago or in really cheap installations, RG59 might have been used.
>I’m not able to tear out all the coax cable from the antenna to the new tv and replace it with hdmi cable, so that’s out of the question<
HDMI and coax cable are NOT the same or compatible with each other, so that is good!! 
Coax is for RF and HDMI is a digital cable. Totally different cables for totally difference uses.
In fact, if you are just using a roof antenna and do not have anything else, like a blu ray DVD player, you will not even need a HDMI cable.
The first responder who said "The old coax will receive HD provided that your TV has a NT/AT tuner built in" is totally wrong and does not know what he is talking about. There is no such thing as a NT/AT tuner... he means ATSC http://en.wikipedia.org/wiki/HDTV_tuner
but the fact is, you have already told us your TV will have a ATSC tuner as soon as you tell us you are buying an HDTV. What tuner is in the TV has nothing at all to do with coax.
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3ft LMR-400 Antenna Jumper Coax Cable N & RP-TNC male 3 $12.95 |
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10 ft LMR-400 Jumper Ham CB UHF VHF Coax RF Radio Cable $22.95 |
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8ft LMR-400 Antenna Jumper Coax Cable PL-259 Connectors $19.95 |
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3ft LMR400 Router Antenna Coax Cable N plug RP-SMA plug $12.21 |
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35 ft LMR400 Scanner Antenna Coax Cable N male to BNC $49.98 |
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18 FOOT CO-PHASE CB RADIO COAX CABLE, 2 ANTENNAS, NEW $11.99 |
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1 ea. RELCOMM, SMA COAX RELAY SWITCH SPDT, 28 VDC, RDS-2S1A6, MICROWAVE, USED $20.00 |
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Antenna Cable Male M/M SMA Plug Coax Connector Adapter $1.80 |
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2pcs RF Antenna CATV TV FM Coax Cable PAL Male Jack Plug Connector Adapter $2.00 |
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Antenna Interface RF Coax Cable Male Plug Adapter 5 Pcs $6.52 |
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ProComm DUAL 2 ft Fiberglass CB Antennas with 3 way Mounting Base & Coax White $34.00 |
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ProComm DUAL 4 ft Fiberglass CB Antennas with 3 way Mounting Base & Coax White $34.00 |
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COAX ANTENNA SWITCH W/ RG8X JUMPER- 2-POS, 1000W 1.8 TO 600 MHZ.- WORKMAN CS201 $27.95 |
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18 FOOT GREY MINI 8 CB RADIO COAX CABLE $9.99 |
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9 FOOT GREY CB RADIO MINI 8 COAX CABLE $8.99 |
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2 Lot 12Ft RG-8X Mini 8 Coax PL-259 Male to Male Ham Radio Antenna Jumper Cable $12.50 |
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RF Antenna CATV TV FM Coax Cable PAL Female Jack Plug Connector 2pcs $3.79 |
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GODAR EURO R10A UNIVERSAL EUROPEAN GERMAN RADIO COAX ANTENNA TERMINAL ADAPTER $5.99 |
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OPEK 3/8-24 Antenna Stud Mount w/ 17FT RG-58 coax cable & PL-259 PS-15 $14.95 |
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GODAR R-15A UNIVERSAL QUICK CONNECT RELEASE RADIO COAX ANTENNA TERMINAL ADAPTER $5.99 |
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6ft LMR400 Antenna Jumper Coax Cable BNC M to BNC F $15.96 |
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Antenna Interface RF Coax Cable Male Plug Adapter 5 Pcs $6.67 |
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2 Linears 2 Antennas and coax $700.00 |
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Belden 3′ GREY B8×3G CB Ham Coax Antenna Cable $9.45 |
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RF Male CATV TV FM Antenna Jack Coax Plug Connector $3.02 |
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Antenna Cable Male M/M SMA Plug Coax Connector Adapter $1.50 |
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TRAM 3265 UHF 5″ MAGNET MOUNT WITH 17′ RG58 STRANDED CENTER COAX & PL259 CONN. $24.99 |
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100 FT DAVIS RG-8X LOW LOSS 50 OHM ANTENNA COAX RG 8X $54.75 |
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MFJ 1704 – 4 Position Coax Switch – New $77.95 |
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5″ MAGNETIC CB ANTENNA MOUNT WITH 17′ OF COAX, NEW $9.99 |
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BARJAN 9′ RG58AU COAXIAL COAX CABLE FOR CB RADIO ANTENNAS BLACK PL-259 CONNECTOR $4.99 |
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Times LMR-400 Coax RF Ham CB Antenna Cable 25ft N PL259 $37.93 |
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Hustler DCL Base Station Scanner Antenna w/50′ Coax NEW $44.95 |
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3FT RG-58 ANTENNA COAX PATCH CABLE w/ MOLDED PL-259s $8.95 |
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LMR400 Ham CB Antenna Coax Cable 50 ft PL-259 Connector $67.65 |
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LMR-400 Coax 6 Meter Base Tower VHF Antenna Cable 35ft $44.95 |
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Belden 12′ GREY B8×12G CB Ham Coax Antenna Cable $13.77 |
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BNC-M to SMA-F Radio Antenna Coax Adapter Kenwood Cable $7.03 |
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NEW 75 FT DAVIS BURY-FLEX 50 OHM ANTENNA COAX CABLE $64.95 |
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100Ft RG-8X Mini 8 Coax PL-259 Male to Male Amateur or Ham Radio Antenna Cable $29.95 |
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BNC Male to UHF PL259 Female Antenna RF COAX Adaptor,76 $4.99 |
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8ft LMR-400 Coax Cable PL-259 N Female Connectors $19.95 |
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1000W – 1.8 TO 600 MHZ – Coax Antenna SWITCH – 2 position – Opek CX-201U $29.75 |
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COPHASE COAX for CB Radio Dual Antennas 18 ft per side – Workman CP18PLPL $11.75 |
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15″ ANTENNA SCANNER KIT BAND WIDTH MIRROR MOUNT COAX $9.99 |
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Right angle coax connector (sold 4 per) $14.00 |
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3′ BLACK DUAL CB ANTENNA KIT WITH BRACKETS & COAX CABLE $35.99 |
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3′ WHITE DUAL CB ANTENNA KIT WITH BRACKETS & COAX CABLE $35.99 |
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2 Lot 20Ft. RG-8X Mini 8 Coax PL-259 Male to Male Ham Radio Antenna Jumper Cable $15.00 |
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4′ BLACK CB ANTENNA KIT WITH BRACKET & COAX CABLE $17.99 |
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VHF Marine Antenna 38″ With Coax & connecter WSP1600 $26.91 |
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PL259 Rg 8u 213 Silver Connector Antenna Coax Coaxial Adapter Connector Bird 43 $2.50 |
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UG-176/U For PL259 Connector Antenna Coax Coaxial Adapter Connector $0.99 |
GPS Systems for Ntp Time Servers and Timing Applications
Nowadays GPS is most commonly known for vehicle navigation solutions. However, the GPS system can be used for many other useful purposes. For instance, many computer network time synchronisation solutions, such as NTP time servers, use the atomic clocks on board each GPS satellite for accurate timing. The GPS system can be used as an accurate reference clock for synchronising time-critical applications on computers and networks. This article describes how computer systems can utilise GPS time and discusses what equipment is required to provide a precision timing reference.
The GPS system is a United States military system intended for global navigation. The GPS system is a space-based system, consisting of a network of 24 orbiting satellites. Precise navigation and positioning is achieved by utilising precision timing signals and triangulation between multiple satellites. Each orbiting satellite has an integrated atomic clock timing reference to provide ultra high precision timing. Each satellite broadcasts timing information to within a few nanoseconds of the correct time to provide positioning to an accuracy of better than 10m. This precise timing information can be used by NTP time servers and other computer timing equipment as a highly accurate time reference. The great thing about GPS is that it works anywhere in the world and is entirely free to air service.
Each GPS satellite transmits a low-power radio signal down to the surface of the Earth. Two separate frequencies are utilised, designated L1 and L2. The L1 band is the civilian signal; transmitted at 1575.42 MHz. L2 is the military frequency, intended for ultra-high precision positioning. The radio signals are transmitted from the satellites by line of sight. The transmitted signal is easily powerful enough to pass through clouds, glass and most plastics but is absorbed by more substantial material such as brick, roofing materials and metals. The ideal location for a GPS antenna tends to be outdoors and ideally on a rooftop with the best possible view of the sky.
With the advent of GPS navigation equipment for the mass market, GPS antennas and receivers can be obtained at very reasonable cost. A GPS antenna is utilised to receive and amplify the GPS radio signals. While a GPS receiver decodes the information and presents it in a computer readable format. Many antennas are available with integrated receivers but these have the drawback of only providing a few meters of cabling to the host NTP time server or computer system. Marine antennas are designed to withstand the worst of the weather, they typically screw onto a threaded pole to provide a secure mounting system. These antennas provide the best solution for static timing applications.
The GPS receiver is generally embedded into the NTP time server or encapsulated within an enclosure. A GPS receiver is a small elecronic device that receives amplified GPS signals from an antenna via a coaxial cable. The receiver decodes these signal and provides a computer readable output usually via a RS232 or USB interface. Most receivers provide decoded information such as: position, visible satellites, precise time and an accurate pulse output timing reference.
Coaxial cable is utilised to provide a connection between the GPS antenna and receiver. The cable distance can be critical. The antenna must amplify the GPS signal sufficiently to overcome any cable losses associated with the cable run utilised. Better quality antennas generally provide more amplification (gain) additionally higher quality coax cables can be used with much smaller signal losses per meter allowing for relatively long cable runs between a antenna and receiver. In order to extend cable runs still further GPS amplifiers can be used to boost the signal transmitted down the coax cable. Typically, a GPS amplifier sits in-line on the coax cable and is powered from the receiver. Multiple amplifiers can be used for extremely long cable runs.
A roof mounted GPS antenna can be prone to lightning strikes and voltage surges. It is recommended that surge suppressors are utilised to protect expensive NTP time server and timing systems from potential damage. A surge suppressor is essentially a barrier that sits in-line on the coax cable between the antenna and receiver that protects the receiver from any potential damage due to voltage surges.
To summarise, the GPS system provides a highly precise timing reference for NTP time servers and other computer timing equipment. It is a reliable free to air service that can be used anywhere in the world. Additionally, with the boom in vehicle navigation systems the technology required to receive GPS broadcasts is continually falling in price.
About the Author
The author of this article, Dave Evans, provides a technical authoring service to a number of computer network timing hardware manufacturers. Dave’s expertise in the field of atomic clock, NTP server and time server systems has led to him becoming a leading author in the field. Click here, if you would like to read more about NTP time server solutions.
iPhone 4 Antenna Issues: 10 Questions Steve Jobs Needs to Answer
News Analysis: Apple CEO Steve Jobs took the stage in Cupertino July 16 to address iPhone 4 problems. But after he was done, he left more questions for consumers and enterprise customers to ask.
