KRAMER ELECTRONICS LTD.
19 WARNING!
1. The Twisted-Pair Interface/Kramer Tool is calibrated at th e factory for transparent operation at 1 meter.
Any re-tuning will upset the machine’s transparency.
2. Do not attempt to adjust the GAIN/LEVEL trimm ers without using accompanying standard calibrated
oscilloscope or waveform monitor!
11.5 (TP-1xl, TP-2xl, TP-6, 704, 705, 708, 712 Only)
HF Control function enables the operator to compensate for degradation of the video signal due to too long or
non-standard cables. Degradation and loss of video signal are mainly the result of stray capacitance that occurs
in long cables. As longer cables are used, the problem is aggravated, resulting in fine detail loss as well as in
color degradation. Hence, it is necessary to compensate for the loss by using the Twisted Pair/Kramer Tool
HF/EQ. control trimmer; equalization is performed by first connecting a Color Bar Generator to a Twisted Pair
Interface/Kramer Tool transmitter input. A waveform-monitor (or an Oscilloscope with 75ohm termination) is
then connected to the long cable output. A known color bar signal is applied to the Twisted Pair
Interface/Kramer Tool input and compared to the signal monitored at the far end. The operator adjusts the
HF/EQ. trimmer until the measured output chrominance signal matches that of the input signal.
WARNING!
3. The Twisted Pair Interface/Kramer Tool is
calibrated at the factory for transparent operation at
1 meter. Any re-tuning will upset machine’s
transparency.
4. Do not attempt to adjust the EQ./HF trimmers
without using accompanying standard calibrated
oscilloscope or waveform monitor!
11.6 (709, 710 Only)
The Y/C system (Luminance and Chrominance) is a complex division of the video signal that is operated in
systems such as S-VHS, where the Luminance signal (with the sync) and Chrominance signal (with the color
burst) are transmitted separately. The result is very high quality pictures; however, to cope with the comple xity
of Y/C, special devices such as processors, switchers, amplifiers, etc. are needed during serious video editing.
The connector used in this system is a 4-p type with two coaxial wires.
11.6.1
Y Gain Control The Y Gain (Luminance) trimmer is utilized whenever a need arises to control the Y component of the Y/C
video. The operator adjusts the trimmer with an appropriate screwdriver until a satisfactory level of luminance is
achieved.
11.6.2
C Gain Control The C Gain (Chrominance) trimmer is utilized whenever a need arises to control the C component of the Y/C
video. The operator adjusts the trimmer with an appropriate screwdriver until a satisfactory level of
chrominance is achieved.
11.6.3
Y EQ. Control All the cables leading to and from acceptors and sources should have precisely the same length. If cables’
lengths are not equal (for example, the “Y” cable is shorter than the “ C” cable) undesirable effects such as color
smear, delay problems (misregistration of the black and white content with the color) and others might appear.
When small details of the picture fade or disappear or loss of sharpness and resolution occurs, gently adjust the
Y EQ. trimmer until a satisfactory display is achieved. For more details concerning the effects of cables length
on high frequency video signals, refer to section 11.5 "HF Control".