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 Post subject: Best way to boost Analog CCTV cam signal - 1000' RG59 cable
PostPosted: Sun Mar 19, 2017 10:46 am 
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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 ?


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 Post subject: Re: Best way to boost Analog CCTV cam signal - 1000' RG59 ca
PostPosted: Sun Mar 19, 2017 4:14 pm 
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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

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 Post subject: Re: Best way to boost Analog CCTV cam signal - 1000' RG59 ca
PostPosted: Sun Mar 19, 2017 5:18 pm 
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Yes I know but somebody else did the wiring so damage is done.

What option do I have ?


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 Post subject: Re: Best way to boost Analog CCTV cam signal - 1000' RG59 ca
PostPosted: Sun Mar 19, 2017 6:08 pm 
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bentech wrote:
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 ?


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 Post subject: Re: Best way to boost Analog CCTV cam signal - 1000' RG59 ca
PostPosted: Sun Mar 19, 2017 9:04 pm 
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26VAC & 12VDC

It's now connected to 26VAC


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 Post subject: Re: Best way to boost Analog CCTV cam signal - 1000' RG59 ca
PostPosted: Sun Mar 19, 2017 11:51 pm 
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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??

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 Post subject: Re: Best way to boost Analog CCTV cam signal - 1000' RG59 ca
PostPosted: Mon Mar 20, 2017 2:24 am 
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bentech wrote:
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


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 Post subject: Re: Best way to boost Analog CCTV cam signal - 1000' RG59 ca
PostPosted: Mon Mar 20, 2017 9:12 am 
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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 !


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 Post subject: Re: Best way to boost Analog CCTV cam signal - 1000' RG59 ca
PostPosted: Mon Mar 20, 2017 8:04 pm 
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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

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 Post subject: Re: Best way to boost Analog CCTV cam signal - 1000' RG59 ca
PostPosted: Tue Mar 21, 2017 2:30 pm 
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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' ?

:D


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 Post subject: Re: Best way to boost Analog CCTV cam signal - 1000' RG59 ca
PostPosted: Tue Mar 21, 2017 4:35 pm 
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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

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