Split An Analog NTSC CCTV Camera Signal To Feed Both An Encoder And An Existing CCTV Matrix

Has anyone found a cost effective way to split an analog NTSC CCTV camera signal to feed both an encoder and an existing CCTV matrix. We have a situation where we have a large quantity of DVRs that supported looping outputs that now feed a large CCTV matrix. The cable is all there. Customer needs to replace DVRs with encoders. Has anyone found a product to do this passively without effecting signal strength/quality? Has anyone found a small/neat way of doing this with DAs? We can't re-wire everything to matrix and expand the matrix to support looping outputs to the new encoders. Existing matrix supports serial integration with PLC, we can remove matrix.

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