Focus-enhancements 3.2 User Manual download pdf (Page 180)

Troubleshooting

166

Preventing Cabling and

Connection Problems

The suggestions listed below provide basic tips for preventing or

minimizing problems related to cabling and connections to and

from the Firefly.

❏ Use the best cable you can afford.

❏ Use the shortest cables possible.

For composite video, PAL or NTSC, RG-59 cable can be

used for distances of up to 20 meters between the video

source and the acceptor. No signal deterioration should

show on the screen. For longer distances, up to 30 meters,

use RG-11 type cable. For s-video, standard, inexpensive

cables allow operating distances of 5-7 meters. Very little

deterioration is apparent. For component video, RG-59

cables are suitable for up to 10 meters. For longer distances,

up to 20-25 meters, a better cable should be used, such as

RG-11.

❏ Check that impedance of the cable really matches your

application. Firefly is terminated at 75 ohms.

❏ Check the connectors on the cables. Poor quality connectors

may have worse effects than the cables themselves.

❏ Use appropriate amplifiers if needed. Because Firefly-SC

uses unbalanced audio, it is recommended that distances

over 10 meters use a “Audio Line Amp/Balancer”, such as

Radio Design Labs “Stick On”.

❏ Keep cables away from sources of interference - electric

motors, main cables, transmitters, light dimmers, etc.

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Focus-enhancements 3.2 User Manual Page 180