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KRAMER ELECTRONICS LTD.
18
11.
USING the TWISTED-PAIR INTERFACES/KRAMER TOOLS
11.1 Powering on the Twisted-pair Interfaces/Kramer Tools
NOTES
1. Twisted-Pair Interfaces/Kramer Tools should be powered on only after all connections are completed
and all source devices have already been powered on. Do not attempt to connect or disconnect any
video, audio or control signal to the Twisted-Pair Interface/Kramer Tool while it is powered on!
2. The AC outlet should be near the equipment and should be easily accessible. To fully disconnect
equipment, remove power cord from its socket.
For the
TP-1
xl,
TP-2
xl,
TP-11N
,
TP-12N, TP-11xl
,
TP-12xl
perform the following:
1) When the machine’s power cord is connected to the AC outlet, press the toggle switch on the far-left front
panel to the up position, where it is illuminated.
2) Operate the acceptors.
For the
TP-6
and the
Kramer Tools
perform the following:
1) Connect the Twisted-Pair Interface/Kramer Tool DC socket to an appropriate DC source. Observe proper
polarity!
2) Make sure that the led on the front panel is illuminated.
3) Operate the acceptors.
11.2
Looping
(TP-2
xl
704,708 only)
The looping function enables the operator to extend the number of receivers connected to the system. The
following example describes looping performed by using 3 receivers. A balanced (twisted pair) signal from the
transmitter reaches the input of the first machine. From the looping connector of this machine, a cable is
connected to input socket of the second machine. The loop output of the second machine is then connected to
the input socket of the third machine. In this way, all 3 receivers can output the transmitted signal. The operator
must switch the termination switches of all the Twisted-Pair Interfaces/Kramer Tools except for the last to "
Hi-
Z
" position. The
last
machine's termination switch should always be in the "
Term
" position in order to maintain
a well-matched balanced line from the first to the last Twisted-Pair Interface/Kramer Tool. Note that if the
looping function is not used, the termination switch should be set to "Term".
11.3
Polarity
(704, 708 only)
The Polarity function enables the operator to invert the incoming signal for the case where the polarity of the
incoming signal is incorrect. If no video signal is present at the output, simply invert the incoming signal by
switching the polarity switch.
11.4
Gain Control
(TP-1
xl
, TP-2
xl
, TP-6, 704, 705 708, 712 only)
The level control function enables the operator to control the video signal level or compensate for distortions
caused for example, by too long or too short cables. The incoming signal could also be affected as a result of
using a non-standard, or an uncalibrated video source. Too dark a picture is usually caused by a low video
signal; however, excessive video level "burns" the picture. The sync signal (should be around -0.3V) may be
used to check the conformity of the whole video signal; if sync level is too low or too high, the incoming video
signal is not within the standard level. To correct the incoming video signal, an oscilloscope is connected to the
Twisted-Pair Interface/Kramer Tool output and the operator adjusts the GAIN/LEVEL trimmer until a
satisfactory sync level, and hence a proper picture, is achieved.