bentech 1 Posted March 19, 2017 Hi , Having a cam at a gate that is 1000' RG59 cable with 2 splices Signal is too poor at the DVR and cable is underground. Any way to improve this ? Share this post Link to post Share on other sites
the toss 0 Posted March 19, 2017 If it is good quality coax you should have no problems over 1000'. It should have been done properly in the first place with no joins Share this post Link to post Share on other sites
bentech 1 Posted March 19, 2017 Yes I know but somebody else did the wiring so damage is done. What option do I have ? Share this post Link to post Share on other sites
tomcctv 190 Posted March 19, 2017 Hi , Having a cam at a gate that is 1000' RG59 cable with 2 splices Signal is too poor at the DVR and cable is underground. Any way to improve this ? Hi is your camera 12v ? Share this post Link to post Share on other sites
bentech 1 Posted March 20, 2017 26VAC & 12VDC It's now connected to 26VAC Share this post Link to post Share on other sites
the toss 0 Posted March 20, 2017 Its probably a bit late now but CVI ( and probably TVI) will run out to 500m. Have you done a DC resistance measurement to check those joins?? Share this post Link to post Share on other sites
tomcctv 190 Posted March 20, 2017 26VAC & 12VDC It's now connected to 26VAC Hi . Then I would use a bi-wave.2100/2200 .. I have never had a problem using them over that distance Video - power - audio or PTZ control over 1 coax cable. You will need to put 12v to cam not 24v Share this post Link to post Share on other sites
bentech 1 Posted March 20, 2017 Toss , When you said measuring the resistance to check the join , what reading should I expect and how to do it ? -Should I measure the DC resistance with a DVM ? -Or the impedance in AC , how ? -Connect a load at one end and measure at the other end ? Tks ! Share this post Link to post Share on other sites
the toss 0 Posted March 21, 2017 1) short inner to outer at one end and measure DC ^ at other ( return loss ) You will need to know your cable type/specs which may present a problem if it's not your cable and has been buried Share this post Link to post Share on other sites
bentech 1 Posted March 21, 2017 Tks ! For a burial 1000' RG59 (inner 20AWG solid) with braid 95% , what would be approximately the resistance ? Possible ~41 ohms over 1000' ? Possible 10dB loss on 1000' ? Share this post Link to post Share on other sites
the toss 0 Posted March 21, 2017 It is hard to say without more info. If it is 20awg 95% "pure copper" then 41^ seems a bit high. The 10dB loss would depend on what frequency it is measured. If you swept a cable from 1Mhz to 1Ghz the attenuation would vary from about 2dB @ 1Mhz to 40 dB @ 1Ghz over 100m Share this post Link to post Share on other sites
