singMai DB09 Video Receiver User Manual
- June 13, 2024
- singmai
Table of Contents
DB09
Video Receiver
User Manual
Revisions
| Date | Revisions | Version |
|---|---|---|
| 27-09-2023 | First draft | 0.1 |
Introduction
DB09 is a standard definition (SD) / high definition (HD) video receiver. It
accepts analogue video from either twisted pair (differential) or coaxial
cable and compensates for long cable runs using an adjustable matching filter.
Its 75MHz video bandwidth means it can accept NTSC, PAL, 960H, AHD, HD-CVI and
HD-TVI video. The video is DC restored and two buffered and filtered single
ended outputs are provided.
DB09 requires 12VDC which is provided via the supplied AC-DC converter.
Quick start guide
Connect the DB09 to the supplied AC/DC adaptor. Fit the appropriate blades to
the adaptor for your country. Blades are supplied for North America, Europe,
UK, China and Australia. The adaptor accepts AC between 90 and 264VAC – the
full specification is provided in Appendix A.
The connections to the DB09 are shown in Figure 1.
Connect the 12VDC jack from the adaptor to the +12VDC ‘Power in’ socket on the
DB09. The ‘Power On’ LED should light up blue.
Connect your video input to either the UTP (RJ-45) connector or the coaxial
video input (BNC). Switching between the two inputs is by the Coax (switch UP)
/ UTP (switch DOWN) switch. You can connect both UTP and coaxial inputs at the
same time if required.
Figure
1 DB09 Connections.
The DB09 provides two independent video outputs. The single ended outputs
should be terminated in 75Ω. The outputs are filtered and buffered. The SD/HD
switch selects the output filter bandwidth, reducing any out of band noise.
The SD selection (switch UP) passes NTSC/PAL or 960H video, the HD selection
(switch DOWN) is for analogue HD such as AHD.
Two adjustments are available to compensate for cable loss. The DC Gain
control allows an adjustable gain that affects all frequencies equally and is
designed to compensate for the DC cable loss. The HF Boost control boosts the
high frequencies of the video input using a filter that is the inverse of the
cable high frequency loss. The response of this filter is set using the Coax
(for coaxial cable) / UTP (for UTP cable) switch. The filter can accurately
compensate for up to 300m of UTP cable and 200m of coaxial cable. Longer
distances can be compensated for but with less accuracy.
DB09 Technical Details
A simplified block diagram of the DB09 is shown in Figure 2.
Figure 2 DB09 Block diagram.
The +12VDC from the AC/DC power adaptor is filtered and protected from over-
range or reverse polarity inputs. The 12VDC input is then regulated to provide
clean ±5VDC for the module.
The coaxial video input is pseudo-differentially received which reduces hum
pickup over long cable runs. The video input is terminated by 75Ω and is
protected from out-of-range inputs or glitches.
The UTP video input is differentially received, terminated in 100Ω and is
protected from out-of-range inputs or glitches. Pin 1 of the RJ-45 input is
the positive video input and pin 2 is the negative video input. The other pins
are not connected.
The selected video input is then passed through the cable compensating
filters. The broadband gain and high frequency boost are user adjustable.
Figures 3 and 4 show the expected results for different lengths of coaxial and
UTP cable.
The output from the compensating filter is then DC restored and filtered and buffered. The output filter helps to reduce noise and can be set to either SD or HD video. The filter responses are shown in Figures 5 and 6. This output filter sets the overall frequency response of the DB09.
The buffer amplifies the video by a gain x2 (6dB) so that it can drive a series 75Ω resistor. Each output must be terminated in 75Ω for the DB09 to have the correct gain. Because each output is individually buffered either or both outputs maybe be connected – any unused output may be left unconnected.
Specification
Power: +9-14V (+12VDC nominal) @ ~120mA (all outputs driven).
Dimensions: 120mm x 78mm x 27mm.
Video input: NTSC-M / PAL /SECAM, NTSC / PAL 960H, AHD, HD-CVI, HD-TVI.
75Ω input impedance (coaxial).
100Ω input Impedance (UTP).
1V pk-pk nominal input. Maximum input before clipping 1.6V pk-pk.
Luma bandwidth: 9.0MHz ± 0.5dB (SD mode). 50.0MHz ± 0.5dB (HD mode).
Gain controls set to minimum.
Gain: 0dB ± 0.5dB. Gain controls set to minimum.
Differential gain/phase: <1%, <1°. (NTSC/PAL). Gain controls set to minimum.
K-factor: <1%. (NTSC/PAL). Gain controls set to minimum.
Group delay: ±10ns.
Operating temperature: -10 – +40 degC.
Appendix A: AC-DC adaptor
The specification for the supplied AC-DC adaptor is shown in Figures 7 and 8.
Figure 7
Power supply specification: electrical.
Figure 8 Power supply specification:
mechanical.
Revision 0.1
Documents / Resources
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singMai DB09 Video
Receiver
[pdf] User Manual
DB09 Video Receiver, DB09, Video Receiver, Receiver
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