richiemiami 0 Posted May 17, 2008 I'm installing a 4th camera on a existing cctv setup I have a few questions: The distance between the dvr and camera location is about 150 feet is that fine with rg59? The camera that I'm using for this installation has audio output is rg59 the standard transport for this type of signal and is there any loss with 150 feet of cable? Lastly if I use siameese rg59 for video and power what type of power supply voltage would i need to start off with to get 12volts and 150 ma 150 feet away on rg59? thanks for all help in advance richie Share this post Link to post Share on other sites
C7 in CA 0 Posted May 17, 2008 You will have practically no voltage drop at those distances. So a 12v power supply should work just fine. Share this post Link to post Share on other sites
scorpion 0 Posted May 17, 2008 The camera that I'm using for this installation has audio output. Is rg59 the standard transport for this type of signal and is there any loss with 150 feet of cable? You can use the RG59 for audio. Loss will depend on what kind of camera, or should I say what kind of microphone, and support electronics that go with it. If it has a built in preamplifier then you should be good to go. If it does not have a preamplifier then you can hook it up, and test it. If it works then you are good to go, if it does not then you will have to add a preamplifier from the wire to what ever you are hooking the audio up to, which I assume will be the DVR. If you are an installer then it would be worth it to get a crimping tool for compression fittings. You can get an RG59 RCA compression fitting to put on the wire then it will plug right in to an RCA input. You can crimp/twist/compress an BNC connector then you can use an adapter such as this: http://eclipsecctv.com/ECL-1010_connector.html 4-Channel Stereo Microphone Mixer http://www.radioshack.com/product/index.jsp?productId=2102920&cp=&sr=1&origkw=microphones+amplifiers&kw=microphones+amplifiers&parentPage=search This can be used for PCs http://www.radioshack.com/product/index.jsp?productId=2548721&cp=&pg=6&sr=1&origkw=microphones&kw=microphones&parentPage=search Here is a portable tester for audio http://www.radioshack.com/product/index.jsp?productId=2062620&cp=&sr=1&origkw=microphones+amplifiers&kw=microphones+amplifiers&parentPage=search Share this post Link to post Share on other sites
richiemiami 0 Posted May 21, 2008 thanks for the help guys I did the wiring today and tomorrow I will put in the camera/microphone and see how it works I will use an f-connector to rca at the camera end and twist on bnc for the pvr end I assume the center of the rca for the microphone to be possitive? thanks for the help richie Share this post Link to post Share on other sites
richiemiami 0 Posted May 21, 2008 one last question with the preamp do I have to put it by the microphone? for the picture that you posted shows a computer one meaning that it could be used on the pvr end thanks richie Share this post Link to post Share on other sites
scorpion 0 Posted May 21, 2008 I assume the center of the rca for the microphone to be possitive? Yes. with the preamp do I have to put it by the microphone? Too many variables to answer that question. For short runs it may not matter. For long wire runs the signal may not be strong enough to travel far, and the preamp may help getting the signal there. Test it at both ends, and hear what the results are. You will have to send power to where the mic is if you put the preamp at the mic. I use these: http://eclipsecctv.com/ECL-MIC_microphone_1.html I have to run a wire for the 12 volts, and a wire for the audio. This has a built in preamp. ****************WARNING:*************** check with your local laws BEFORE you do audio! Click on these links at http://www.rcfp.org/taping/ Introduction State-by-state guide Tape-recording laws at a glance Consent and its limits Interstate phone calls Possession and publication The FCC’s role Cellular & cordless calls Citations to cases in articles Share this post Link to post Share on other sites
richiemiami 0 Posted May 21, 2008 I'm wondering if i could test by simply pluging the audio mic rca into the tv where the pvr is I'm not certain how the pvr works if it has to be on one particular camera for the microphone to work? I would think if it's in a 4 way split screen than audio wouldn't be on? I want to use this setup with a slingbox so maybe the microphone with built in preamp is the ticket and I could use it simply as the audio input on the slingbox along with the 4 up screen of the security camera I know what you're thinking I should just use the network interface but the owners want the convience of use the slingbox to control tivo, cable, and security btw I'm using one of those convert motion detector spy cameras for this application again thanks for the help it's been very helpful richie Share this post Link to post Share on other sites
richiemiami 0 Posted May 21, 2008 On that powered microphone you posted: How far should it be able to go on a rg59 siamese wire? 100-150 feet? richie Share this post Link to post Share on other sites
scorpion 0 Posted May 21, 2008 It would depend on the environment, but yes it should travel that. If you are really serious about doing audio, which I am trying to deter you as much as I can, then you really need to do a lot of research, and testing before you do the installation. Here is what you are going to find. When you listen to the audio it is going to sound like a microphone in a school cafeteria. Have you ever heard audio in a cafeteria, or a restaurant? Outside recording is real difficult. Inside recording can be done by using shotcun microphones, and using EQ to tune out highs, and lows so that you only have the freqs of the human voice. Notch filters are even better, but you are talking thousands of dollars. If you only need to record in a certain location then take the microphone that I linked for example. Roll up construction paper, or paper to form a long tube the diameter of the microphone. Put the mic in to the tube at one end. Now you are eliminating side noise and concentrating in one direction. There are other tricks but I will save them for my "job security". You will have to hire someone for higher needs. Share this post Link to post Share on other sites