Singmai Electronics SM09 User manual

SM09 User Manual Revision 0.1 Page 1 of 11
SM09
SD/960H
Distribution Amplifier
User Manual
Revision 0.1
22nd April 2021

SM09 User Manual Revision 0.1 Page 2 of 11
Revisions
Date Revisions Version
22-04-2021 First draft 0.1

SM09 User Manual Revision 0.1 Page 3 of 11
Contents
Revisions...................................................................................................................................................2
Contents ................................................................................................................................................... 3
Figures ...................................................................................................................................................... 3
1. Introduction .................................................................................................................................... 4
2. Quick start guide .............................................................................................................................5
3. SM09 Technical Details ...................................................................................................................6
4. Specification....................................................................................................................................8
Appendix A: AC-DC adaptor......................................................................................................................9
Figures
Figure 1 SM09 module.............................................................................................................................. 4
Figure 2 SM09 Connections...................................................................................................................... 5
Figure 3 SM09 Block diagram. ..................................................................................................................6
Figure 4 SM09 filter response................................................................................................................... 6
Figure 5 Multiburst frequency sweep. .....................................................................................................7
Figure 6 Multi-burst frequency driving 100m of cable.............................................................................7
Figure 7 Power supply specification – Page 1...........................................................................................9
Figure 8 Power supply specification – Page 2.........................................................................................10
Figure 9 Power supply specification – Page 3.........................................................................................11

SM09 User Manual Revision 0.1 Page 4 of 11
1. Introduction
SM09 is a video distribution amplifier module. It accepts a PAL/NTSC/SECAM or PAL/NTSC 960H input
and provides 8 simultaneous outputs. Each output is individually buffered and filtered.
SM09 requires 5VDC which is provided via the supplied AC-DC converter.
Figure 1 SM09 module.

SM09 User Manual Revision 0.1 Page 5 of 11
2. Quick start guide
Connect the SM09 to the supplied AC/DC adaptor. The adaptor should be supplied with a power lead
appropriate to your country. The adaptor accepts AC between 100 and 240VAC – the full specification
is provided in Appendix A.
Connect the 5VDC jack from the adaptor to the +5VDC ‘Power in’ socket on the SM09. The ‘Video In’
BNC centre should light up yellow.
Connect a composite video input to the ‘Video In’ BNC. Any or all of the eight ‘Video Out’ BNC maybe
connected. Each ‘Video out’ is a copy of the video input.
Figure 2 SM09 Connections.

SM09 User Manual Revision 0.1 Page 6 of 11
3. SM09 Technical Details
A simplified block diagram of the SM09 is shown in Figure 3.
Figure 3 SM09 Block diagram.
The +5VDC from the AC/DC power adaptor is filtered and protected from over-range or reverse
polarity inputs by a resettable fuse. This fuse will protect the SM09 until the out-of-range condition is
removed when it automatically reset itself. The 5VDC input is then regulated to provide a ‘clean’
+4VDC for the video input buffer and DC restoration circuits and a 3.3VDC supply for the output filter
and buffer.
The video input is terminated in 75Ω. It is then buffered and protected against out-of-range inputs.
The video input is then DC restored using an active clamp circuit before driving eight identical output
buffers. Each output is filtered to remove any out of band noise – the filter response is shown in
Figure 4.
Figure 4 SM09 filter response.

SM09 User Manual Revision 0.1 Page 7 of 11
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 SM09 to have the correct gain. Because each output is individually
buffered any or all of the outputs maybe be connected – unused outputs may be left unconnected.
The SM09 has a nominal gain of x1 (0dB) when the output is terminated in 75Ω. Because of the series
termination each output can drive long lengths of cable without overshoot or ringing of the signal.
Figure 5 shows the output of the SM09 with a multi-burst frequency sweep video input.
Figure 5 Multiburst frequency sweep.
Figure 6 shows the same signal when the SM09 is driving 100m of low-cost coaxial cable (RG-59).
Whilst some ‘droop’ can be seen, the signal shows no overshoots or ringing artifacts.
Figure 6 Multi-burst frequency driving 100m of cable.

SM09 User Manual Revision 0.1 Page 8 of 11
4. Specification
Power: +5VDC ± 5% @ ~100mA (all outputs driven).
Dimensions: 160mm x 78mm x 27mm.
Video input: NTSC-M / PAL /SECAM or NTSC / PAL 960H. 75Ω input impedance.
1V pk-pk nominal input. Maximum input before clipping 1.6V pk-pk.
Luma bandwidth: 8.5MHz ± 0.1dB.
Gain: 0dB ± 0.5dB.
Differential gain/phase: <1%, <1°.
K-factor: <1%.
Group delay: ±10ns.
Operating temperature: -10 – 40 degC.

SM09 User Manual Revision 0.1 Page 9 of 11
Appendix A: AC-DC adaptor
The specification for the supplied AC-DC adaptor is shown in Figures 7-9.
Figure 7 Power supply specification – Page 1.

SM09 User Manual Revision 0.1 Page 10 of 11
Figure 8 Power supply specification – Page 2.

SM09 User Manual Revision 0.1 Page 11 of 11
Figure 9 Power supply specification – Page 3.