sexydadee 0 Posted August 24, 2009 What is the max cable run for CCTV on RG59? Also, what is the frequency for composite video? I have these attenuation specs for RG59 that states the dB loss/100ft. at a certain frequency. Is this what they use to determine the max cable run? Can I check if my camera can transmit over a certain distance via RG59 by using only the attenuation spec of the cable and the output of the camera which is a 1V peak to peak composite signal? Thanks Share this post Link to post Share on other sites
survtech 0 Posted August 24, 2009 RG-59U copper/copper (100% copper center conducter and 95% or better copper braided shield) is typically good for up to 750ft. Some people may recommend more or less but that is the most common. RG-6U of the same type may be run up to 1,500ft. Do not use CATV (antenna) cable, which typically has a copper-clad steel center conductor and aluminum foil shield. Baseband or composite video (analog CCTV) has a frequency range of approximately 30Hz to approximately 10MHz. Most attenuation specs are for high frequencies (10MHz, 100MHz, 1GHz, etc.) so they aren't really usable for CCTV. Share this post Link to post Share on other sites
sexydadee 0 Posted August 25, 2009 how were they able to come up with the max distance of 750 ft.? what formula or factors did they use? Thanks Share this post Link to post Share on other sites
survtech 0 Posted August 25, 2009 It has to do with the cable's DC resistance, capacitance and attenuation. Here is a link to a West Penn pdf on the subject. Share this post Link to post Share on other sites
sexydadee 0 Posted August 26, 2009 thanks for the link man, really a good read Share this post Link to post Share on other sites
