I have aquired 2 Magnavox Observation Cameras they receive power and output video through a single coax cable. I need to find out if there is a way to seperate the 2 so I can put power through 1 set of wires and get video out through the coax. I received some vague instructions on how to do this which resulted in letting the smoke out of one of them (she don' work no mo).
Instuctions as follows:
" I am not familiar with the particular camera you have. However, these all work the same way.
The DC power was sent up the coax and the video is AC coupled and sent back down. If you open the
camera and trace the wire from the center pin of the UHF connector, it will lead to an inductor
and a large value capacitor. The video is coupled through the capacitor, which blocked the DC
power from the video output amp. The inductor (coil) blocks the video from getting back into the
power section.
Cut the inductor loose from the center wire of the connector. Put well filtered +12 VDC at 500
mA (1/2 amp) or greater into the inductor at this point while running a video cable from the jack
to a video monitor or to the video input of your home VCR. Then you can see the video on your TV.
Power return is to the ground of the connector or any other convenient grounding node.
If this is helpful, let me know. You did not mention your skill level, so I spoke as to another
engineer. I did get an enquirey about this same thing recently and that fellow was able to make
his camera run using the described method."
unfortunatly the curcuit board is packed and hard to trace. The model # is MC3511 AL01. I can scan the curcuit boards if needed or if someone has access to the original curcuit diagrams that would help too.
Thanks in advance.
Instuctions as follows:
" I am not familiar with the particular camera you have. However, these all work the same way.
The DC power was sent up the coax and the video is AC coupled and sent back down. If you open the
camera and trace the wire from the center pin of the UHF connector, it will lead to an inductor
and a large value capacitor. The video is coupled through the capacitor, which blocked the DC
power from the video output amp. The inductor (coil) blocks the video from getting back into the
power section.
Cut the inductor loose from the center wire of the connector. Put well filtered +12 VDC at 500
mA (1/2 amp) or greater into the inductor at this point while running a video cable from the jack
to a video monitor or to the video input of your home VCR. Then you can see the video on your TV.
Power return is to the ground of the connector or any other convenient grounding node.
If this is helpful, let me know. You did not mention your skill level, so I spoke as to another
engineer. I did get an enquirey about this same thing recently and that fellow was able to make
his camera run using the described method."
unfortunatly the curcuit board is packed and hard to trace. The model # is MC3511 AL01. I can scan the curcuit boards if needed or if someone has access to the original curcuit diagrams that would help too.
Thanks in advance.