Diagnostic Aids; Cable Length Compensation - BBV RX100 Installation Manual

4. SETUP

DIAGNOSTIC AIDS

Two red LEDs and one Green LED are mounted on-board to give simple system status information. Their
functions are as follows:
Cable LED
Regular Blinking
Blinking but mainly ON
Blinking but mainly OFF
Error LED
On
Both LEDs
Off
Data LED (Iss PCB 4 onwards only)
is
Test Link
All BBV equipment is designed to auto-tune and compensate for any discrepancies in the transmitted telemetry
signal; there are no further adjustments that need to be made.
VIDEO LAUNCH AMPLIFIER AND CABLE LENGTH COMPENSATION
The interface features a video launch amplifier with two variable controls situated close to the BNC connectors:
Lift and Gain. These are pre-adjusted for a cable distance of 500m of CT125, and are adjustable to compensate
for video detail or signal losses if and when longer or shorter cable lengths are used to connect the telemetry
transmitter to the interface.
Fig. 3 Launch Amplifier
HF Lift
Gain
CAMERA
LIFT
GAIN
TELEMETRY
Default position adjusted for 500M of CT125.
For shorter cable lengths, turn the Gain control anti-clockwise until 1V p-p is present at the telemetry
transmitter. For longer cable lengths, turn the Gain control clockwise until 1V p-p is present at the telemetry
transmitter.
Rx100 installation manual V1.17 29 Aug 08.doc
- Telemetry and video signals are OK.
- No Telemetry from the transmitter.
- No video from the camera.
- Telemetry transmission error.
- No power or major PCB fault.
-
being sent to the dome.
- Is used to confirm correct operation of the
Rx100 and dome and also that the RS485
connection is correct. Shorting the link after the
Rx100 is powered up will cause the dome to pan
left and zoom in. Removing the link will stop the
pan left and will zoom out the lens. This is
dependant on dome type.
The purpose of each control is:
Video
from
dome
GAIN varies the overall signal level.
Video
to
LIFT boosts the high frequency component of the video
transmitter
signal. If the high frequency component is too low, picture
appears 'washed out' and lacking detail.
Will flash on and off very fast when data
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