**Today I checked the CCD cables which is connected to the VIDEOMUX.**
**17 cables are type of RG59, 8 cables are type of RG58. I have not figured out the type of other cables(23 cables) yet.**
The reason I am checking the cables is for replacing the cables with impedance of 50 or 52 ohm by those with **impedance of 75 ohm.**
After I figures out which cable has not proper impedance, I will make new cables and substitute them in order to match the impedance, which would lead to better VIDEO signal.
To check the impedance of each CCD cable, I went to the VIDEOMUX and looked for the label on the cable's surface.
Type of RG59 is designated to the cable of impedance 75ohm. I wrote down each cable's input or output channel number with observation(whether it is of type RG59 or not).
The result of observation is as follows.
Type |
channel number where it is connected to |
Type 59 |
in#2, in#11, in#12, in#15, in#18, in#19, in#22, in#26, out#3, out#4, out#11, out#12, out#14, out#17, out#18, out#20, out#21 |
Type 58 |
in#17, in#23, in#24, in#25, out#2, out#5, out#7, out#19 |
unknown type |
others |
For 23 cables that I have not figured out their type, cables are too entangled so it is limited to look for the label along each cable.
I will try to figure out more tomorrow. Any suggestion would be really appreciated. |